traslations fix

Signed-off-by: galeon <dertiellis@gmail.com>
Обновить .gitea/workflows/tests.yml
2026-10-14 09:32:17 +03:00 · 2026-10-13 06:01:40 +00:00 · 2026-10-13 08:51:07 +03:00 · 2026-10-12 13:14:08 +03:00 · 2026-10-12 09:25:48 +03:00
74 changed files with 8877 additions and 34 deletions
@@ -1,16 +1,3 @@
-# Сборка BiLauncher под Windows, Linux и macOS и публикация в Gitea Releases.
-#
-# push тега vX.Y.Z (или vX.Y.Z-rc1 → pre-release):
-#   create-release создаёт черновик релиза → три сборки прикладывают к нему файлы →
-#   publish добавляет SHA256SUMS.txt и снимает флаг черновика. Если какая-то сборка
-#   упала, релиз остаётся черновиком и пользователям не виден.
-# Ручной запуск (workflow_dispatch): те же сборки, но результат — артефакты прогона,
-#   релиз не создаётся.
-#
-# Пути к Qt на раннерах задаются в их config.yaml (runner.envs): QT_ROOT — kit Qt,
-# QT_TOOLS — папка Tools из Qt Online Installer (там CMake и Ninja).
-# Секрет RELEASE_TOKEN — PAT с правом repository: write.
-
 name: release

 on:
@@ -56,7 +43,6 @@ jobs:
          TOKEN: ${{ secrets.RELEASE_TOKEN }}
          TAG: ${{ steps.meta.outputs.tag }}
        run: |
-          # Описание релиза — раздел CHANGELOG.md для этой версии
          base="${TAG#v}"; base="${base%%-*}"
          notes=$(awk -v v="$base" '
            /^## \[/ { if (on) exit; if (index($0, "[" v "]")) { on=1; next } }
@@ -85,12 +71,9 @@ jobs:
        run: |
          export PATH="$QT_TOOLS/CMake/bin:$QT_TOOLS/Ninja:$PATH"
          rm -rf build AppDir dist
-          # LIBDIR=lib: zlibreference.cpp ищет libz рядом, в ../lib/BiLauncher,
-          # а на Ubuntu по умолчанию был бы lib/x86_64-linux-gnu.
          cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release \
                -DCMAKE_PREFIX_PATH="$QT_ROOT" \
                -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib
-          # На ВМ 6 ГБ памяти: без ограничения 42 параллельных компилятора уходят в OOM.
          cmake --build build -j 8
          cmake --install build --prefix "$PWD/AppDir/usr"

@@ -142,7 +125,6 @@ jobs:
        shell: powershell
        run: |
          $ErrorActionPreference = "Stop"
-          # Короткие пути: дерево WebEngine легко вылезает за MAX_PATH.
          $build = "C:\r\bl-build"; $stage = "C:\r\bl-stage"; $dist = "$PWD\dist"
          Remove-Item -Recurse -Force $build, $stage, $dist -ErrorAction SilentlyContinue

@@ -163,14 +145,10 @@ jobs:
          & "$env:ISCC_DIR\ISCC.exe" /Q "/DAppVersion=$env:VERSION" "/DSourceDir=$stage" "/DOutputDir=$dist" packaging\windows\BiLauncher.iss
          if ($LASTEXITCODE) { throw "iscc" }

-          # Portable: то же дерево, что ставит установщик, без vc_redist
-          # (в portable-варианте среда выполнения MSVC должна уже стоять в системе).
          Remove-Item "$stage\bin\vc_redist.x64.exe" -ErrorAction SilentlyContinue
          $portable = "C:\r\BiLauncher-$env:VERSION"
          Remove-Item -Recurse -Force $portable -ErrorAction SilentlyContinue
          Move-Item $stage $portable
-          # Системный bsdtar по полному пути: в PATH раннера раньше стоит GNU tar из Git,
-          # который не умеет zip и принимает «C:» за имя удалённого хоста.
          & "$env:SystemRoot\System32\tar.exe" -a -c -f "$dist\BiLauncher-$env:VERSION-win64-portable.zip" -C C:\r "BiLauncher-$env:VERSION"
          if ($LASTEXITCODE) { throw "zip" }
          Remove-Item -Recurse -Force $portable
@@ -179,7 +157,6 @@ jobs:
          $sums = Get-ChildItem $dist | ForEach-Object {
              "{0}  {1}" -f (Get-FileHash $_.FullName -Algorithm SHA256).Hash.ToLower(), $_.Name }
          $b64 = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes(($sums -join "`n") + "`n"))
-          # Не Out-File: PowerShell 5.1 пишет UTF-8 с BOM, и имя первой переменной ломается.
          [IO.File]::AppendAllText($env:GITHUB_OUTPUT, "sums=$b64`n")

      - name: Загрузка в релиз
@@ -226,8 +203,6 @@ jobs:
      - id: pack
        name: Ad-hoc подпись и DMG
        run: |
-          # Без Developer ID: ad-hoc подпись нужна, чтобы приложение вообще
-          # запускалось на Apple Silicon; Gatekeeper всё равно спросит подтверждение.
          codesign --force --deep --sign - stage/BiLauncher.app
          codesign --verify --deep --strict stage/BiLauncher.app
          mkdir -p dmgroot dist
@@ -0,0 +1,183 @@
+name: tests
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+  schedule:
+    - cron: "0 2 * * *"
+  workflow_dispatch:
+
+concurrency:
+  group: tests-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  linux:
+    runs-on: linux
+    timeout-minutes: 90
+    env:
+      BILAUNCHER_REQUIRE_FAKE_INTERNET: "1"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Сборка лаунчера и тестов
+        run: |
+          export PATH="$QT_TOOLS/CMake/bin:$QT_TOOLS/Ninja:$PATH"
+          launcher=""
+          if command -v ccache >/dev/null; then
+            launcher="-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache"
+          fi
+          cmake -S . -B build-tests -G Ninja -DCMAKE_BUILD_TYPE=Debug \
+                -DBILAUNCHER_BUILD_TESTS=ON -DCMAKE_PREFIX_PATH="$QT_ROOT" $launcher
+          cmake --build build-tests -j 8
+
+      - name: Статические проверки (переводы, qmllint, CHANGELOG)
+        run: CMAKE="$QT_TOOLS/CMake/bin/cmake" python3 tests/scripts/static_checks.py build-tests
+
+      - name: Тесты
+        run: |
+          export PATH="$QT_TOOLS/CMake/bin:$PATH"
+          ctest --test-dir build-tests --output-on-failure -j 4 \
+                --output-junit "$PWD/build-tests/junit.xml"
+
+      - name: Отчёты
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: tests-linux
+          if-no-files-found: ignore
+          path: |
+            build-tests/junit.xml
+            build-tests/qmllint.log
+            build-tests/Testing/Temporary/LastTest.log
+
+  windows:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || github.event_name == 'push'
+    runs-on: windows
+    timeout-minutes: 150
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Сборка и тесты
+        shell: powershell
+        run: |
+          $ErrorActionPreference = "Stop"
+          # Короткий путь: дерево WebEngine легко вылезает за MAX_PATH (см. release.yml).
+          $build = "C:\r\bl-tests"
+          Remove-Item -Recurse -Force $build -ErrorAction SilentlyContinue
+
+          $vs = & "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -products * `
+                  -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
+          Import-Module "$vs\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+          Enter-VsDevShell -VsInstallPath $vs -SkipAutomaticLocation -DevCmdArguments "-arch=x64 -host_arch=x64"
+          $env:PATH = "$env:QT_TOOLS\CMake_64\bin;$env:QT_TOOLS\Ninja;$env:PATH"
+
+          cmake -S . -B $build -G Ninja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBILAUNCHER_BUILD_TESTS=ON "-DCMAKE_PREFIX_PATH=$env:QT_ROOT"
+          if ($LASTEXITCODE) { throw "cmake configure" }
+          cmake --build $build
+          if ($LASTEXITCODE) { throw "cmake build" }
+
+          ctest --test-dir $build --output-on-failure --output-junit "$build\junit.xml"
+          $code = $LASTEXITCODE
+          New-Item -ItemType Directory -Force test-results | Out-Null
+          Copy-Item "$build\junit.xml" test-results\ -ErrorAction SilentlyContinue
+          if ($code) { throw "ctest" }
+
+      - name: Отчёты
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: tests-windows
+          if-no-files-found: ignore
+          path: test-results/
+
+  macos:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || github.event_name == 'push'
+    runs-on: macos
+    timeout-minutes: 120
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Сборка и тесты
+        run: |
+          export PATH="$QT_TOOLS/CMake/CMake.app/Contents/bin:$QT_TOOLS/Ninja:$PATH"
+          cmake -S . -B build-tests -G Ninja -DCMAKE_BUILD_TYPE=Debug \
+                -DBILAUNCHER_BUILD_TESTS=ON -DCMAKE_PREFIX_PATH="$QT_ROOT"
+          cmake --build build-tests
+          ctest --test-dir build-tests --output-on-failure -j 4 \
+                --output-junit "$PWD/build-tests/junit.xml"
+
+      - name: Отчёты
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: tests-macos
+          if-no-files-found: ignore
+          path: build-tests/junit.xml
+
+  package-smoke-linux:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: linux
+    timeout-minutes: 90
+    steps:
+      - uses: actions/checkout@v4
+      - name: Release-сборка, установка, запуск
+        run: |
+          export PATH="$QT_TOOLS/CMake/bin:$QT_TOOLS/Ninja:$PATH"
+          rm -rf build-smoke smoke-stage
+          launcher=""
+          if command -v ccache >/dev/null; then
+            launcher="-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache"
+          fi
+          cmake -S . -B build-smoke -G Ninja -DCMAKE_BUILD_TYPE=Release \
+                -DCMAKE_PREFIX_PATH="$QT_ROOT" \
+                -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib $launcher
+          cmake --build build-smoke -j 8
+          cmake --install build-smoke --prefix "$PWD/smoke-stage/usr"
+          bash tests/scripts/smoke_installed.sh smoke-stage/usr
+
+  package-smoke-windows:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: windows
+    timeout-minutes: 150
+    steps:
+      - uses: actions/checkout@v4
+      - name: Release-сборка, установка, запуск
+        shell: powershell
+        run: |
+          $ErrorActionPreference = "Stop"
+          $build = "C:\r\bl-smoke"; $stage = "C:\r\bl-smoke-stage"
+          Remove-Item -Recurse -Force $build, $stage -ErrorAction SilentlyContinue
+
+          $vs = & "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -products * `
+                  -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
+          Import-Module "$vs\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+          Enter-VsDevShell -VsInstallPath $vs -SkipAutomaticLocation -DevCmdArguments "-arch=x64 -host_arch=x64"
+          $env:PATH = "$env:QT_TOOLS\CMake_64\bin;$env:QT_TOOLS\Ninja;$env:PATH"
+
+          cmake -S . -B $build -G Ninja -DCMAKE_BUILD_TYPE=Release "-DCMAKE_PREFIX_PATH=$env:QT_ROOT"
+          if ($LASTEXITCODE) { throw "cmake configure" }
+          cmake --build $build
+          if ($LASTEXITCODE) { throw "cmake build" }
+          cmake --install $build --prefix $stage
+          if ($LASTEXITCODE) { throw "cmake install" }
+
+          & powershell -ExecutionPolicy Bypass -File tests\scripts\smoke_installed.ps1 -Prefix $stage
+          if ($LASTEXITCODE) { throw "smoke" }
+          Remove-Item -Recurse -Force $build, $stage -ErrorAction SilentlyContinue
+
+  package-smoke-macos:
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    runs-on: macos
+    timeout-minutes: 120
+    steps:
+      - uses: actions/checkout@v4
+      - name: Release-сборка, установка, запуск
+        run: |
+          export PATH="$QT_TOOLS/CMake/CMake.app/Contents/bin:$QT_TOOLS/Ninja:$PATH"
+          rm -rf build-smoke smoke-stage
+          cmake -S . -B build-smoke -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="$QT_ROOT"
+          cmake --build build-smoke
+          cmake --install build-smoke --prefix "$PWD/smoke-stage"
+          bash tests/scripts/smoke_installed.sh smoke-stage
@@ -64,3 +64,5 @@ build/
 CMakeLists.txt.user*
 stage/
 dist/
+build-tests/
+build-*/
@@ -242,4 +242,12 @@ qt_generate_deploy_qml_app_script(
    NO_UNSUPPORTED_PLATFORM_ERROR
    DEPLOY_USER_QML_MODULES_ON_UNSUPPORTED_PLATFORM
    DEPLOY_TOOL_OPTIONS ${deploy_opts})
-install(SCRIPT ${deploy_script})
+install(SCRIPT ${deploy_script})
+# Автотесты: собираются только по запросу и в установку не попадают.
+# Код лаунчера при этом не меняется — тесты компилируют те же исходники
+# в отдельную статическую библиотеку, см. tests/CMakeLists.txt и doc/testing.md.
+option(BILAUNCHER_BUILD_TESTS "Собрать автотесты (ctest)" OFF)
+if(BILAUNCHER_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(tests)
+endif()
@@ -23,10 +23,12 @@ RDIR="$HOME/act_runner"
 # --- Компилятор и библиотеки ---------------------------------------------------
 # libgl1-mesa-dev — заголовки OpenGL для Qt6::Gui; xcb-* и прочие — то, что
 # Linux-деплой Qt и плагин xcb ищут при упаковке и запуске; libfuse2 — для
-# запуска самого appimagetool (он тоже AppImage).
+# запуска самого appimagetool (он тоже AppImage). ccache ускоряет прогоны
+# автотестов (.gitea/workflows/tests.yml), xvfb нужен их дымовой проверке
+# установленного дерева, если деплой Qt не положил плагин offscreen.
 sudo apt-get update -q
 sudo DEBIAN_FRONTEND=noninteractive apt-get install -y -q \
-    build-essential patchelf file curl git xz-utils \
+    build-essential patchelf file curl git xz-utils ccache xvfb python3 \
    libgl1-mesa-dev libfuse2 libfontconfig1 libdbus-1-3 \
    libxkbcommon-x11-0 libxcb-cursor0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 \
    libxcb-render-util0 libxcb-shape0 libxcb-xinerama0 libxcb-xkb1 \
@@ -98,6 +98,9 @@ QML-модуль собирается в `<build>/qml/BiLauncher` (`OUTPUT_DIREC

 ### Как выпустить версию

+0. Запустить workflow `tests` вручную (Run workflow) и дождаться зелёного прогона на всех трёх
+   системах, включая дымовую проверку установленного дерева. `release.yml` от тестов не зависит,
+   поэтому этот шаг на совести выпускающего. См. [testing.md](testing.md).
 1. Поднять версию в `project(BiLauncher VERSION ...)` в `CMakeLists.txt`.
 2. Добавить в `CHANGELOG.md` раздел `## [x.y.z] — дата`. Его текст станет описанием релиза.
 3. Закоммитить и запушить тег `vx.y.z`. Для предрелиза — `vx.y.z-rc1` (всё после дефиса делает
@@ -166,6 +169,9 @@ VS 2022 Build Tools (это 20–40 минут), Git, Node.js, Inno Setup, вк

 **macOS** — скрипта подготовки нет, раннер настроен вручную.

+Те же раннеры гоняют автотесты (`.gitea/workflows/tests.yml`): Linux — на каждый push, все три
+системы — ночью и по кнопке. Подробности — [testing.md](testing.md).
+
 ---

 При создании этого документа использовался ИИ.
@@ -21,6 +21,19 @@

 На Linux папка лаунчера получается `~/BiLauncher`, без точки, то есть видимая.

+## BILAUNCHER_HOME
+
+`homeOverride()` читает переменную окружения `BILAUNCHER_HOME`. Если в ней абсолютный путь, он
+заменяет домашнюю папку (`~` и `%USERPROFILE%` в таблице выше) для всех путей лаунчера, включая
+папку игры по умолчанию. Пустое или относительное значение не учитывается. Остальной Qt
+(`QDir::homePath()`, `QStandardPaths`) эту переменную не видит.
+
+Переменная нужна тестам и дымовой проверке на Windows: там `QDir::homePath()` спрашивает профиль
+у системы и `USERPROFILE` игнорирует, так что иначе их нельзя увести из настоящего
+`%APPDATA%\BiLauncher`. Новых возможностей она не даёт: кто управляет окружением процесса, на
+Linux и macOS и так подменит `HOME`. Чтобы случайно оставленную переменную было видно, `main.cpp`
+при старте пишет в лог предупреждение с итоговой папкой лаунчера.
+
 Внутри `rootDir()`:

 ```
@@ -4,7 +4,8 @@
 версий, установка модлоадеров и Java, смена сборок и запуск игры, написано на C++.

 Здесь описано, как устроен код. Как собрать проект и выпустить релиз, рассказано в
-[build-and-release.md](build-and-release.md).
+[build-and-release.md](build-and-release.md), как устроены и запускаются автотесты — в
+[testing.md](testing.md).

 ## Общая схема

@@ -131,12 +132,14 @@ LauncherBackend ──────────────── Loc (Localizati
 |------|---------|
 | `i18n/translations.json` | все тексты интерфейса |
 | `tools/check_translations.py` | проверка каталога переводов |
+| `tests/` | автотесты, см. [testing.md](testing.md) |
 | `icons/` | иконки и скрипт, который их генерирует |
 | `images/` | картинки интерфейса |
 | `zlib/` | исходники zlib 1.3.1 (чужой код) |
 | `packaging/` | установщик Windows, лицензии сторонних компонентов |
 | `ci/` | скрипты подготовки раннеров |
 | `.gitea/workflows/release.yml` | сборка релизов |
+| `.gitea/workflows/tests.yml` | автотесты на тех же раннерах |
 | `Screenshots/` | картинки для README |

 ---
@@ -0,0 +1,170 @@
+# Автотесты
+
+Тесты лежат в `tests/` и собираются только по опции `BILAUNCHER_BUILD_TESTS`. В обычную сборку и в
+релизы они не попадают, код лаунчера ради них не менялся.
+
+## Как запустить
+
+```bash
+cmake -S . -B build-tests -G Ninja -DCMAKE_BUILD_TYPE=Debug -DBILAUNCHER_BUILD_TESTS=ON -DCMAKE_PREFIX_PATH=$HOME/Qt/6.11.1/macos
+```
+
+```bash
+cmake --build build-tests
+```
+
+```bash
+ctest --test-dir build-tests --output-on-failure -j 6
+```
+
+Отдельный слой — по метке: `ctest --test-dir build-tests -L unit` (ещё `net`, `backend`, `qml`).
+Отдельный тест — напрямую, с фильтром по функции:
+
+```bash
+build-tests/tests/net/tst_versioninstaller installsModernVersionCompletely
+```
+
+Статические проверки (переводы, qmllint, раздел CHANGELOG для текущей версии):
+
+```bash
+python3 tests/scripts/static_checks.py build-tests
+```
+
+В Qt Creator проект с тестами открывается как обычно: включите `BILAUNCHER_BUILD_TESTS` в настройках
+CMake, тесты появятся в панели «Тесты».
+
+## Что покрыто
+
+| Метка | Тест | Что проверяет |
+|-------|------|---------------|
+| unit | `tst_launcherpaths` | раскладка папки лаунчера, `ensureRootExists` и её отказ, если на месте папки файл |
+| unit | `tst_javaruntime` | ключи видов Java, `JavaRuntimeStore`, какая Java нужна какой версии игры |
+| unit | `tst_modloader` | ключи и названия модлоадеров |
+| unit | `tst_localization` | переключение языков, запасной язык, отсутствующий ключ, язык из `settings.json` |
+| unit | `tst_minecraftversion` | правила Mojang, загрузка json версии, `inheritsFrom`, нативы, удаление версий |
+| unit | `tst_authoffline` | офлайн-UUID как у сервера в offline-mode |
+| unit | `tst_msaredirect` | разбор адреса возврата после входа Microsoft |
+| unit | `tst_gamelauncher` | командная строка игры, нативы, запуск, падение и остановка процесса |
+| unit | `tst_javalocator` | версия java по `-version`, выбор подходящей, поиск в папке лаунчера |
+| unit | `tst_zlibreference` | `LD_PRELOAD` с эталонным zlib на Linux |
+| unit | `tst_buildarchiveworker` | архив, очистка, восстановление, раскатка пака, zip-slip, отмена |
+| unit | `tst_buildswitcher` | переключение сборок туда и обратно, продолжение после обрыва, пак |
+| net | `tst_fakeinternet` | самопроверка перехвата HTTPS (см. ниже) |
+| net | `tst_versionmanifestservice` | каталог Mojang: разбор, кеш, офлайн, общие запросы |
+| net | `tst_seasonalbuildservice` | каталог сезонных сборок: проверки полей, формат, кеш по адресу |
+| net | `tst_modloaderversionservice` | Fabric, Quilt, Forge (с рекомендованными), NeoForge обе схемы |
+| net | `tst_javaruntimeservice` | Adoptium и Mojang, частичные отказы, кеш, запасной x64 на ARM |
+| net | `tst_authservice` | Ely.by: пароль, 2FA, продление токена, authlib-injector |
+| net | `tst_msaauthservice` | вся цепочка Microsoft → Xbox → XSTS → Minecraft, коды ошибок XSTS |
+| net | `tst_versioninstaller` | установка версии целиком, повторы, контрольные суммы, отмена, очередь |
+| net | `tst_seasonalpackdownloader` | загрузка пака: sha256, обрыв, отмена |
+| net | `tst_javainstaller` | Temurin zip и tar.gz, дерево Mojang, zip-slip, отмена |
+| net | `tst_modloaderinstaller` | Fabric по сети, Forge через подставную java, откат после сбоя |
+| backend | `tst_launcherbackend` | всё, что зовёт QML: профили, сборки, настройки, миграция, битые файлы, каталог версий, запуск офлайн / Ely.by с 2FA / Microsoft, Java, сезонная сборка от каталога до раскатки обновления |
+| qml | `tst_qml` | Qt Quick Test: `DarkCombo`, `LabelledField`, `ProgressPanel`, `LoaderRow`, диалоги с настоящим `LauncherBackend` |
+| qml | `tst_qml_smoke` | `Main.qml` поднимается, как в `main.cpp`, без единого предупреждения QML, в том числе после смены языка |
+
+Ночью и перед релизом ещё собирается Release, ставится через `cmake --install` и запускается на
+10 секунд (`tests/scripts/smoke_installed.sh` / `.ps1`). Это ловит то, чего не видят тесты:
+недоложенные деплоем модули Qt и плагины, ссылки на библиотеки вне дерева, неподписанный бандл.
+
+## Как тесты изолированы
+
+**Файлы.** `LauncherPaths` строит пути от домашней папки. Общий `main` тестов
+(`tests/common/testenv.h`) до создания приложения направляет `BILAUNCHER_HOME` (а заодно `HOME`
+и `USERPROFILE`) на временную папку, и каждый процесс работает в своей, на всех ОС, параллельно.
+`BILAUNCHER_HOME` нужна ради Windows: там `QDir::homePath()` берёт профиль у системы и `HOME`
+с `USERPROFILE` не читает. Дочерние процессы наследуют переменную. Если папка лаунчера или папка
+игры по умолчанию всё же оказалась вне песочницы, процесс сразу завершается с кодом 2 и ничего не
+трогает. Дымовая проверка установленной сборки на Windows (`smoke_installed.ps1`) тоже запускает
+лаунчер с `BILAUNCHER_HOME` на временную папку.
+
+**Сеть.** Адреса серверов в сервисах зашиты константами, а свои `QNetworkAccessManager` они
+создают сами. Зато прокси и SSL-настройки у Qt общие на процесс, и код лаунчера их не трогает.
+`FakeInternet` (`tests/common/fakeinternet.h`) ставит прокси на локальный порт и отключает
+проверку сертификата. Каждое https-соединение приходит к нему как `CONNECT host:443`, переводится
+в TLS с тестовым сертификатом из `tests/fixtures/tls/` и обслуживается по таблице маршрутов.
+Запрос на адрес без маршрута получает 404 и попадает в `unmatched()`. При старте сервер проверяет
+себя сам. Если TLS-бэкенд Qt не умеет серверный режим, сетевые тесты пропускаются с понятным
+сообщением, а в CI на Linux (`BILAUNCHER_REQUIRE_FAKE_INTERNET=1`) это ошибка.
+
+`FakeMojang` (`tests/common/fakemojang.h`) публикует через `FakeInternet` крошечную, но устроенную
+как настоящая версию игры: json, `client.jar`, библиотеки, натив под текущую ОС, индекс ресурсов,
+сами ресурсы, конфиг логирования.
+
+**Java.** `fake_java` (`tests/fake_java/main.cpp`, без Qt) копируется в нужную папку как
+`bin/java` (`java.exe`/`javaw.exe`). На `-version` она отвечает версией из `fake-java.cfg` рядом с
+собой, а при обычном запуске пишет аргументы в файл, печатает заданные строки, создаёт файлы
+(так изображается установщик Forge) и выходит с нужным кодом либо падает.
+
+**Код лаунчера.** `tests/CMakeLists.txt` собирает все `.cpp` из корня, кроме `main.cpp`, в
+статическую библиотеку-QML-модуль `bilauncher_testlib`. Новый файл попадёт в тесты сам. QML-файлы
+берутся тоже все, ресурсы — из строк `RESOURCES` корневого `CMakeLists.txt`. Тестовая библиотека
+собирается без Qt WebEngine, так что `backend.microsoftAvailable` в тестах всегда `false`.
+
+## Найденные проблемы (QEXPECT_FAIL)
+
+Тест, который описывает правильное поведение, но пока падает, помечен `QEXPECT_FAIL`. В отчёте он
+выглядит как `XFAIL` и прогон не валит. Когда ошибку исправят, тест станет `XPASS` и прогон упадёт:
+тогда пометку нужно снять.
+
+| Тест | Проблема |
+|------|----------|
+| `tst_versioninstaller::retryOfLastFileIsNotLost` | если временный сбой (503, таймаут) или неверная контрольная сумма пришлись на последний файл, `retryOrFail()` откладывает повтор на 400 мс, а `pump()` сразу видит пустую очередь и завершает установку ошибкой «файлы отсутствуют» |
+| `tst_modloaderversionservice::neoForgeLegacyArtifactArrivesFirst` | если ответ старого артефакта `net.neoforged:forge` приходит раньше основного, основной затирает слитые записи (`state->merged = parsed`), и версии NeoForge для 1.20.1 пропадают |
+| `tst_buildarchiveworker::dotFilesSurviveRoundTrip` | `QZipReader` срезает ведущую точку в именах записей, и после переключения сборок `.fabric/`, `.mixin.out/` возвращаются как `fabric/`, `mixin.out/` |
+| `tst_javainstaller::cancelDuringDownload` | `JavaInstaller::cancel()` шлёт `canceled` дважды: `abort()` синхронно доводит ответ до обработчика, который уже шлёт сигнал |
+| `tst_gamelauncher::extractNatives` | битый jar с нативами не считается ошибкой: `QZipReader::isReadable()` проверяет только, что файл открылся |
+
+Ещё одна особенность, которую тесты обходят: синглтон `Localization` запоминает JS-движок, который
+его создал. Второй `QQmlApplicationEngine` после уничтожения первого оставляет этот указатель
+висячим, поэтому дымовой тест держит один движок на весь прогон, как и приложение.
+
+## CI: `.gitea/workflows/tests.yml`
+
+Тесты идут на тех же host-раннерах, что собирают релизы. Отдельные машины и Docker не нужны:
+Qt, CMake и Ninja там уже есть, пути берутся из `QT_ROOT` и `QT_TOOLS` в `config.yaml` раннера.
+
+| Событие | Что запускается |
+|---------|-----------------|
+| push в любую ветку, pull request | Linux: сборка с тестами, статические проверки, все тесты |
+| ночью (02:00 UTC) и вручную (Run workflow) | Linux, Windows и macOS, плюс дымовая проверка установленного дерева на всех трёх |
+
+Windows и macOS на каждый коммит не запускаются: вместимость у раннеров 1, и часовая сборка с
+WebEngine задерживала бы релизы. Перед выпуском версии запустите workflow вручную и дождитесь
+зелёного прогона. `release.yml` от тестов не зависит.
+
+Новый push в ту же ветку отменяет незаконченный прогон (`concurrency`). Отчёт JUnit
+(`junit.xml`), лог qmllint и полный лог ctest прикладываются к прогону как артефакты.
+
+На Linux-раннере полезен `ccache`: с ним повторная сборка занимает минуты. `ci/setup-runner-linux.sh`
+ставит его вместе с `xvfb`, который нужен дымовой проверке, если деплой Qt не положил плагин
+`offscreen`.
+
+**qmllint.** В коде уже есть 53 предупреждения, а код ради тестов не правится. Поэтому проверка
+работает как храповик: она падает, только если предупреждений стало больше числа в
+`tests/qmllint-baseline.txt`. Если часть исправили, опустите число.
+
+## Как добавить тест
+
+1. Создайте `tests/<слой>/tst_<имя>.cpp` с классом на QtTest и в конце файла напишите
+   `BILAUNCHER_TEST_MAIN(Класс)` (или `BILAUNCHER_GUI_TEST_MAIN`, если нужен `QGuiApplication`).
+   Затем `#include "tst_<имя>.moc"`.
+2. Добавьте имя в список в `tests/<слой>/CMakeLists.txt`.
+3. В `init()` вызывайте `TestEnv::resetLauncherRoot()`, папку игры берите из
+   `TestEnv::freshDir("game")`.
+4. Для сети поднимите `FakeInternet` в `initTestCase()` через `BILAUNCHER_START_FAKE_INTERNET(m_net)`
+   и опишите маршруты: `m_net.route("https://host/path", FakeResponse::json(...))`. Для префикса
+   поставьте `*` в конце, для ошибок, задержек и обрывов есть `FakeResponse::error`, `delayMs`,
+   `hang`, `drop`, `truncateTo`.
+5. Крупные ответы серверов кладите в `tests/fixtures/`. Если в json нужны имя ОС, архитектура или
+   классификатор нативов, используйте подстановки `%OS%`, `%OTHER%`, `%ARCH%`, `%NATIVE%` и
+   `Fixtures::readTemplate()`.
+
+У moc есть ограничение: сырые строки `R"(...)"` и длинные вложенные инициализаторы `{{...}}`,
+разбитые на строки, внутри файла с `Q_OBJECT` сбивают его разбор («Not a signal or slot
+declaration» или пустой `.moc`). Такие данные выносите в фикстуры или собирайте по шагам.
+
+---
+
+При создании этого документа использовался ИИ.
@@ -8,6 +8,7 @@
 #include <QFileInfo>
 #include <QHash>
 #include <QProcess>
+#include <QRegularExpression>
 #include <QtCore/private/qzipreader_p.h>

 namespace {
@@ -46,7 +47,11 @@ bool isNativeLibraryFile(const QString &fileName)
    for (const QString &suffix : suffixes)
        if (fileName.endsWith(suffix, Qt::CaseInsensitive))
            return true;
-    return fileName.contains(QStringLiteral(".so."));   // libfoo.so.1
+    // Версионированные so (libfoo.so.1, libfoo.so.1.2.3). Хвост — строго цифры,
+    // иначе в натив попадают служебные файлы LWJGL вроде liblwjgl.so.sha1 / .so.git.
+    static const QRegularExpression versionedSo(QStringLiteral("\\.so(\\.\\d+)+$"),
+                                                QRegularExpression::CaseInsensitiveOption);
+    return versionedSo.match(fileName).hasMatch();
 }

 } // namespace
@@ -9,7 +9,7 @@
      "en": "English"
    },
    "_readme": [
-      "Единственный файл со всеми текстами интерфейса. Правится руками.",
+      "Файл локализации",
      "Ключ: <домен>.<вид>.<имя>, сегменты в lowerCamelCase.",
      "Домены: app, common, settings, profile, build, seasonal, version, java,",
      "loader, auth, launch, game, switch, storage, zlib.",
@@ -3,21 +3,38 @@

 #include <QDir>
 #include <QFileInfo>
+#include <QtGlobal>

 namespace {

 const QString kFolderName = QStringLiteral("BiLauncher");

+// Домашняя папка, от которой строятся все пути (см. LauncherPaths::homeOverride()).
+QString homeBase()
+{
+    const QString overridden = LauncherPaths::homeOverride();
+    return overridden.isEmpty() ? QDir::homePath() : overridden;
+}
+
 } // namespace

+QString LauncherPaths::homeOverride()
+{
+    // Относительный путь зависел бы от текущей папки процесса — такой не принимаем.
+    const QString value = QDir::fromNativeSeparators(qEnvironmentVariable("BILAUNCHER_HOME"));
+    if (value.isEmpty() || !QDir::isAbsolutePath(value))
+        return QString();
+    return QDir::cleanPath(value);
+}
+
 QString LauncherPaths::containerDir()
 {
 #if defined(Q_OS_WIN)
-    return QDir::homePath() + QStringLiteral("/AppData/Roaming");
+    return homeBase() + QStringLiteral("/AppData/Roaming");
 #elif defined(Q_OS_MACOS)
-    return QDir::homePath() + QStringLiteral("/Library/Application Support");
+    return homeBase() + QStringLiteral("/Library/Application Support");
 #else // Linux и прочие Unix-системы
-    return QDir::homePath();
+    return homeBase();
 #endif
 }

@@ -4,6 +4,14 @@

 namespace LauncherPaths {

+// Все пути строятся от домашней папки пользователя (QDir::homePath()). Переменная
+// окружения BILAUNCHER_HOME с абсолютным путём подменяет её — только для путей
+// лаунчера (папка лаунчера и папка игры по умолчанию), остальной Qt её не видит.
+// Нужна тестам и дымовой проверке на Windows: там QDir::homePath() спрашивает
+// профиль у системы и HOME/USERPROFILE игнорирует. Пустое или относительное
+// значение не учитывается. Возвращает подменённую папку или пустую строку.
+QString homeOverride();
+
 QString containerDir();
 QString rootDir();
 QString defaultMinecraftDir();
@@ -1,5 +1,8 @@
+#include "launcherpaths.h"
 #include "localization.h"

+#include <QDebug>
+#include <QDir>
 #include <QGuiApplication>
 #include <QIcon>
 #include <QQmlApplicationEngine>
@@ -33,6 +36,10 @@ int main(int argc, char *argv[])

    QGuiApplication::setDesktopFileName(QStringLiteral("bilauncher"));

+    // Случайно оставленная BILAUNCHER_HOME увела бы данные в чужую папку — пусть это будет видно в логе.
+    if (!LauncherPaths::homeOverride().isEmpty())
+        qWarning().noquote() << "BILAUNCHER_HOME: данные лаунчера в" << QDir::toNativeSeparators(LauncherPaths::rootDir());
+
    if (!Localization::instance().load())
        return -1;

@@ -0,0 +1,128 @@
+# Автотесты BiLauncher. Включаются опцией BILAUNCHER_BUILD_TESTS (корневой CMakeLists.txt).
+#
+# Код лаунчера не меняется ради тестов. Те же исходники собираются ещё раз в
+# статическую библиотеку-QML-модуль bilauncher_testlib (URI BiLauncher): её
+# линкуют все тесты — и C++-тесты сервисов, и Qt Quick Test для QML.
+# Подробности — doc/testing.md.
+
+find_package(Qt6 REQUIRED COMPONENTS Test QuickTest Network Qml Quick QuickControls2)
+
+set(CMAKE_AUTOMOC ON)
+
+# --- Исходники лаунчера -----------------------------------------------------------
+# Все .cpp/.h из корня, кроме main.cpp: новый файл попадёт в тесты сам.
+file(GLOB LAUNCHER_TEST_CPP CONFIGURE_DEPENDS "${PROJECT_SOURCE_DIR}/*.cpp" "${PROJECT_SOURCE_DIR}/*.h")
+list(FILTER LAUNCHER_TEST_CPP EXCLUDE REGEX "/main\\.cpp$")
+
+# QML-файлы модуля. MicrosoftLoginDialog.qml нужен только со сборкой WebEngine;
+# тестовая библиотека собирается без него (как сборка без Qt WebEngine), так что
+# backend.microsoftAvailable в тестах всегда false.
+file(GLOB LAUNCHER_TEST_QML RELATIVE "${PROJECT_SOURCE_DIR}" CONFIGURE_DEPENDS "${PROJECT_SOURCE_DIR}/*.qml")
+list(REMOVE_ITEM LAUNCHER_TEST_QML MicrosoftLoginDialog.qml)
+
+# Ресурсы модуля берём прямо из корневого CMakeLists.txt (строки «RESOURCES …»),
+# чтобы список не пришлось вести в двух местах.
+file(READ "${PROJECT_SOURCE_DIR}/CMakeLists.txt" _root_cmake)
+string(REGEX MATCHALL "\n[ \t]*RESOURCES[^\n]*" _resource_lines "${_root_cmake}")
+set(LAUNCHER_TEST_RESOURCES "")
+foreach(_line IN LISTS _resource_lines)
+    string(REGEX REPLACE "^[ \t\n]*RESOURCES[ \t]+" "" _line "${_line}")
+    string(REGEX REPLACE "[ \t]+" ";" _files "${_line}")
+    list(APPEND LAUNCHER_TEST_RESOURCES ${_files})
+endforeach()
+list(REMOVE_ITEM LAUNCHER_TEST_RESOURCES "")
+
+# Файлы QML-модуля лежат в корне проекта, а не в tests/: для qt_add_qml_module
+# им нужны пути относительно текущего каталога, поэтому копируем их в дерево сборки.
+set(_module_dir "${CMAKE_CURRENT_BINARY_DIR}/module_src")
+set(_module_qml "")
+foreach(_file IN LISTS LAUNCHER_TEST_QML LAUNCHER_TEST_RESOURCES)
+    configure_file("${PROJECT_SOURCE_DIR}/${_file}" "${_module_dir}/${_file}" COPYONLY)
+endforeach()
+foreach(_file IN LISTS LAUNCHER_TEST_QML)
+    list(APPEND _module_qml "${_module_dir}/${_file}")
+    set_source_files_properties("${_module_dir}/${_file}" PROPERTIES QT_RESOURCE_ALIAS "${_file}")
+endforeach()
+set(_module_res "")
+foreach(_file IN LISTS LAUNCHER_TEST_RESOURCES)
+    list(APPEND _module_res "${_module_dir}/${_file}")
+    set_source_files_properties("${_module_dir}/${_file}" PROPERTIES QT_RESOURCE_ALIAS "${_file}")
+endforeach()
+
+qt_add_library(bilauncher_testlib STATIC)
+qt_add_qml_module(bilauncher_testlib
+    URI BiLauncher
+    OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/qml/BiLauncher"
+    SOURCES ${LAUNCHER_TEST_CPP}
+    QML_FILES ${_module_qml}
+    RESOURCES ${_module_res}
+    NO_LINT
+)
+target_include_directories(bilauncher_testlib PUBLIC "${PROJECT_SOURCE_DIR}")
+target_compile_definitions(bilauncher_testlib PUBLIC
+    LAUNCHER_VERSION="${PROJECT_VERSION}"
+)
+target_link_libraries(bilauncher_testlib PUBLIC
+    Qt6::Quick Qt6::QuickControls2 Qt6::Qml Qt6::Svg Qt6::Core Qt6::CorePrivate Qt6::Gui Qt6::Network
+)
+
+# --- Подставная java --------------------------------------------------------------
+add_executable(fake_java fake_java/main.cpp)
+set_target_properties(fake_java PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON
+    AUTOMOC OFF MACOSX_BUNDLE FALSE WIN32_EXECUTABLE FALSE)
+
+# --- Общая обвязка тестов --------------------------------------------------------
+add_library(bilauncher_testsupport STATIC
+    common/testenv.h common/testenv.cpp
+    common/fixtures.h common/fixtures.cpp
+    common/fakeinternet.h common/fakeinternet.cpp
+    common/fakemojang.h common/fakemojang.cpp
+    common/nettest.h
+)
+# Designated initializers (VersionSpec{.id = ...}) — C++20.
+target_compile_features(bilauncher_testsupport PUBLIC cxx_std_20)
+target_include_directories(bilauncher_testsupport PUBLIC common)
+target_compile_definitions(bilauncher_testsupport PUBLIC
+    BILAUNCHER_FIXTURES_DIR="${CMAKE_CURRENT_SOURCE_DIR}/fixtures"
+    BILAUNCHER_SOURCE_DIR="${PROJECT_SOURCE_DIR}"
+    BILAUNCHER_FAKE_JAVA="$<TARGET_FILE:fake_java>"
+)
+target_link_libraries(bilauncher_testsupport PUBLIC bilauncher_testlib Qt6::Test Qt6::Network Qt6::CorePrivate)
+add_dependencies(bilauncher_testsupport fake_java)
+
+# Окружение всех тестов: без окон, без GPU, без кеша QML на диске.
+set(BILAUNCHER_TEST_ENV
+    "QT_QPA_PLATFORM=offscreen"
+    "QT_QUICK_BACKEND=software"
+    "QML_DISABLE_DISK_CACHE=1"
+    "QT_LOGGING_RULES=qt.network.ssl.warning=false"
+)
+
+# bilauncher_add_test(<имя> LABEL <метка> SOURCES ... [TIMEOUT сек] [GUI])
+function(bilauncher_add_test name)
+    cmake_parse_arguments(ARG "GUI" "LABEL;TIMEOUT" "SOURCES" ${ARGN})
+    add_executable(${name} ${ARG_SOURCES})
+    set_target_properties(${name} PROPERTIES MACOSX_BUNDLE FALSE WIN32_EXECUTABLE FALSE)
+    target_link_libraries(${name} PRIVATE bilauncher_testsupport)
+    if(ARG_GUI)
+        target_link_libraries(${name} PRIVATE bilauncher_testlibplugin Qt6::QuickTest)
+    endif()
+    add_test(NAME ${name} COMMAND ${name})
+    if(NOT ARG_TIMEOUT)
+        set(ARG_TIMEOUT 120)
+    endif()
+    set_tests_properties(${name} PROPERTIES
+        LABELS "${ARG_LABEL}"
+        TIMEOUT ${ARG_TIMEOUT}
+        ENVIRONMENT "${BILAUNCHER_TEST_ENV}")
+    if(WIN32)
+        # DLL Qt — из установки Qt, без windeployqt для каждого теста.
+        set_property(TEST ${name} APPEND PROPERTY ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:Qt6::Core>")
+    endif()
+endfunction()
+
+add_subdirectory(unit)
+add_subdirectory(net)
+add_subdirectory(backend)
+add_subdirectory(qml)
@@ -0,0 +1,2 @@
+# LauncherBackend целиком: всё, что вызывает QML, с настоящими сервисами под ним.
+bilauncher_add_test(tst_launcherbackend LABEL backend TIMEOUT 300 SOURCES tst_launcherbackend.cpp)
@@ -0,0 +1,708 @@
+// Интеграционные тесты LauncherBackend — того, что видит QML. Сервисы под ним
+// настоящие; сеть — FakeInternet, java — подставная, файлы — в песочнице.
+
+#include "testenv.h"
+#include "fakemojang.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "javaruntime.h"
+#include "launcherbackend.h"
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QGuiApplication>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QSignalSpy>
+
+#include <memory>
+
+namespace {
+
+const QString kSeasonalIndex = QStringLiteral("https://launcher-builds.galeonworx.com/index.json");
+const QString kElyAuth = QStringLiteral("https://authserver.ely.by/auth/authenticate");
+const QString kInjectorManifest = QStringLiteral("https://authlib-injector.yushi.moe/artifact/latest.json");
+const QString kInjectorJar = QStringLiteral("https://authlib-injector.yushi.moe/artifact/53/authlib-injector.jar");
+
+bool waitFor(const std::function<bool()> &condition, int ms = 30000)
+{
+    return QTest::qWaitFor(condition, ms);
+}
+
+QStringList strings(const QSignalSpy &spy, int arg = 0)
+{
+    QStringList out;
+    for (const QList<QVariant> &call : spy)
+        out << call.value(arg).toString();
+    return out;
+}
+
+} // namespace
+
+class TestLauncherBackend : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_game;
+
+    void writeSettings(const QJsonObject &extra = {})
+    {
+        QJsonObject settings{{"gameDir", m_game}, {"language", "en"}};
+        for (auto it = extra.begin(); it != extra.end(); ++it)
+            settings.insert(it.key(), it.value());
+        Fixtures::writeJson(LauncherPaths::settingsFile(), settings);
+    }
+
+    static std::unique_ptr<LauncherBackend> make() { return std::make_unique<LauncherBackend>(); }
+
+    // Ждём, пока backend освободится от фоновых операций.
+    static bool waitIdle(LauncherBackend &backend, int ms = 30000)
+    {
+        return waitFor([&] { return !backend.busy() && !backend.downloading() && !backend.switching(); }, ms);
+    }
+
+    // Установить версию через backend и дождаться результата.
+    static bool installVersion(LauncherBackend &backend, const QString &id)
+    {
+        backend.installVersion(id);
+        return waitFor([&] { return backend.isVersionInstalled(id) && !backend.downloading(); });
+    }
+
+    QString fakeJava(const QString &name, const QStringList &config = {})
+    {
+        return Fixtures::installFakeJava(m_game + "/../" + name, "17.0.8", config);
+    }
+
+private slots:
+    void initTestCase()
+    {
+        BILAUNCHER_START_FAKE_INTERNET(m_net);
+    }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+        m_net.setFallback(FakeResponse::error(503));
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+        writeSettings();
+        Localization::instance().setLanguage(QStringLiteral("en"));
+    }
+
+    // --- данные и настройки ----------------------------------------------------
+
+    void freshStartCreatesDataFiles()
+    {
+        QFile::remove(LauncherPaths::settingsFile());
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        QTest::qWait(50);
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QVERIFY(QFile::exists(LauncherPaths::settingsFile()));
+        QVERIFY(QFile::exists(LauncherPaths::profilesFile()));
+        QVERIFY(QFile::exists(LauncherPaths::customBuildsFile()));
+        const QVariantMap s = backend->settings();
+        QCOMPARE(s.value("maxMemoryMb").toInt(), 4096);
+        QCOMPARE(s.value("minMemoryMb").toInt(), 512);
+        QCOMPARE(s.value("language").toString(), QStringLiteral("system"));
+        QCOMPARE(s.value("resolvedGameDir").toString(), QDir::toNativeSeparators(LauncherPaths::defaultMinecraftDir()));
+        QVERIFY(backend->profileNames().isEmpty());
+        QCOMPARE(backend->activeBuildIndex(), -1);
+        QVERIFY(!backend->busy());
+        QVERIFY(!backend->microsoftAvailable());   // тестовая сборка — без WebEngine
+        Localization::instance().setLanguage(QStringLiteral("en"));
+    }
+
+    void profilesCrudAndPersistence()
+    {
+        {
+            auto backend = make();
+            QSignalSpy changed(backend.get(), &LauncherBackend::profilesChanged);
+            backend->addProfile("Steve", "steve", QString());
+            backend->addProfile("Ely", "ely@example.com", "pw", "elyby");
+            backend->addProfile("Odd", "odd", QString(), "something-unknown");
+            QCOMPARE(changed.count(), 3);
+            QCOMPARE(backend->profileNames(), QStringList({"Steve", "Ely", "Odd"}));
+            QCOMPARE(backend->profileAt(1).value("authType").toString(), QStringLiteral("elyby"));
+            QCOMPARE(backend->profileAt(2).value("authType").toString(), QStringLiteral("offline"));
+            QVERIFY(backend->profileAt(9).isEmpty());
+
+            backend->updateProfile(0, "Steve2", "steve2", QString(), "offline");
+            backend->removeProfile(2);
+            backend->removeProfile(42);   // мимо — без последствий
+            QCOMPARE(backend->profileNames(), QStringList({"Steve2", "Ely"}));
+        }
+        const QJsonArray stored = QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::profilesFile())).array();
+        QCOMPARE(stored.size(), 2);
+        QVERIFY(!stored.at(0).toObject().value("clientToken").toString().isEmpty());
+        QVERIFY(stored.at(0).toObject().value("id").toInt() != stored.at(1).toObject().value("id").toInt());
+
+        auto reloaded = make();
+        QCOMPARE(reloaded->profileNames(), QStringList({"Steve2", "Ely"}));
+        QCOMPARE(reloaded->profileAt(1).value("login").toString(), QStringLiteral("ely@example.com"));
+    }
+
+    void elyTokenDroppedWhenCredentialsChange()
+    {
+        Fixtures::write(LauncherPaths::profilesFile(), QJsonDocument(QJsonArray{QJsonObject{
+            {"id", 1}, {"name", "Ely"}, {"login", "a"}, {"password", "p"}, {"authType", "elyby"},
+            {"clientToken", "c"}, {"accessToken", "tok"}, {"uuid", "u"}, {"resolvedName", "Nick"}}}).toJson());
+        auto backend = make();
+        backend->updateProfile(0, "Ely renamed", "a", "p", "elyby");   // только имя — токен живёт
+        QCOMPARE(QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::profilesFile()))
+                     .array().at(0).toObject().value("accessToken").toString(), QStringLiteral("tok"));
+        backend->updateProfile(0, "Ely renamed", "a", "new-password", "elyby");
+        const QJsonObject p = QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::profilesFile())).array().at(0).toObject();
+        QVERIFY(p.value("accessToken").toString().isEmpty());
+        QVERIFY(p.value("resolvedName").toString().isEmpty());
+        QCOMPARE(p.value("clientToken").toString(), QStringLiteral("c"));
+    }
+
+    void customBuildsAndActiveSwitch()
+    {
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->addCustomBuild("Alpha", "play.example.com");
+        backend->addCustomBuild("Beta", QString());
+        QCOMPARE(backend->customBuildNames(), QStringList({"Alpha", "Beta"}));
+        QCOMPARE(backend->activeBuildIndex(), 0);   // настройка пуста — активна первая
+        QCOMPARE(backend->activeBuildName(), QStringLiteral("Alpha"));
+        QVERIFY(!backend->downloading());           // без версии игры ставить нечего
+
+        // Правка версии сбрасывает выбранную под старую версию сборку модлоадера.
+        backend->updateCustomBuild(0, {{"minecraftVersion", "1.20.1"}, {"loader", "fabric"},
+                                       {"loaderVersion", "0.16.10"}, {"resolvedVersionId", "fabric-loader-0.16.10-1.20.1"}});
+        QCOMPARE(backend->customBuildAt(0).value("launchVersionId").toString(), QStringLiteral("fabric-loader-0.16.10-1.20.1"));
+        backend->updateCustomBuild(0, {{"minecraftVersion", "1.21.1"}});
+        QVariantMap alpha = backend->customBuildAt(0);
+        QCOMPARE(alpha.value("loader").toString(), QStringLiteral("fabric"));
+        QVERIFY(alpha.value("loaderVersion").toString().isEmpty());
+        QVERIFY(alpha.value("resolvedVersionId").toString().isEmpty());
+        QCOMPARE(alpha.value("launchVersionId").toString(), QStringLiteral("1.21.1"));
+        QCOMPARE(backend->customBuildAt(1).value("launchVersionId").toString(), QStringLiteral("Beta"));   // по имени
+        QCOMPARE(backend->requiredJavaMajor(0), 21);
+        QCOMPARE(backend->requiredJavaMajor(5), 0);
+
+        // Переключение активной сборки уносит содержимое .minecraft в архив.
+        Fixtures::write(m_game + "/mods/alpha.jar", "a");
+        QSignalSpy active(backend.get(), &LauncherBackend::activeBuildChanged);
+        backend->setActiveBuildIndex(1);
+        QVERIFY(waitIdle(*backend));
+        QCOMPARE(backend->activeBuildIndex(), 1);
+        QVERIFY(active.count() > 0);
+        QVERIFY(!QFile::exists(m_game + "/mods/alpha.jar"));
+        QCOMPARE(backend->settings().value("activeBuildId").toInt(), Fixtures::readJsonFile(LauncherPaths::settingsFile()).value("activeBuildId").toInt());
+
+        const QVariantMap info = backend->customBuildRemovalInfo(0);
+        QCOMPARE(info.value("name").toString(), QStringLiteral("Alpha"));
+        QVERIFY(info.value("hasArchive").toBool());
+        QVERIFY(!info.value("active").toBool());
+
+        // Удаление активной — активной становится первая из оставшихся, её архив разворачивается.
+        backend->removeCustomBuild(1);
+        QVERIFY(waitIdle(*backend));
+        QCOMPARE(backend->customBuildNames(), QStringList{"Alpha"});
+        QCOMPARE(backend->activeBuildIndex(), 0);
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/alpha.jar"), QByteArray("a"));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+    }
+
+    void settingsPersistAndGameDirChange()
+    {
+        Fixtures::writeJson(LauncherPaths::settingsFile(),
+                            QJsonObject{{"gameDir", m_game}, {"language", "en"},
+                                        {"launcherName", "old"}, {"launcherVersion", "1.0"}});
+        const QString other = TestEnv::freshDir(QStringLiteral("other-game"));
+        {
+            auto backend = make();
+            QSignalSpy installedChanged(backend.get(), &LauncherBackend::installedVersionsChanged);
+            QSignalSpy settingsChanged(backend.get(), &LauncherBackend::settingsChanged);
+            backend->updateSettings({{"maxMemoryMb", 2048}, {"jvmArgs", "-XX:+UseZGC"}});
+            QCOMPARE(installedChanged.count(), 0);
+            backend->updateSettings({{"gameDir", other}});
+            QCOMPARE(installedChanged.count(), 1);
+            QCOMPARE(settingsChanged.count(), 2);
+            QCOMPARE(backend->settings().value("resolvedGameDir").toString(), QDir::toNativeSeparators(other));
+        }
+        const QJsonObject stored = Fixtures::readJsonFile(LauncherPaths::settingsFile());
+        QCOMPARE(stored.value("maxMemoryMb").toInt(), 2048);
+        QVERIFY(!stored.contains("launcherName"));    // устаревшие ключи вычищены
+        QVERIFY(!stored.contains("launcherVersion"));
+        auto reloaded = make();
+        QCOMPARE(reloaded->settings().value("jvmArgs").toString(), QStringLiteral("-XX:+UseZGC"));
+    }
+
+    void languageSettingSwitchesLocalization()
+    {
+        auto backend = make();
+        backend->updateSettings({{"language", "ru"}});
+        QCOMPARE(Localization::instance().language(), QStringLiteral("ru"));
+        backend->updateSettings({{"language", "en"}});
+        QCOMPARE(Localization::instance().language(), QStringLiteral("en"));
+    }
+
+    void legacyBuildsFileIsMigrated()
+    {
+        Fixtures::write(LauncherPaths::legacyCustomBuildsFile(), QJsonDocument(QJsonArray{
+            QJsonObject{{"id", 3}, {"name", "Old build"}, {"serverUrl", "mc.example.com"}, {"versionId", "1.12.2"}}}).toJson());
+        auto backend = make();
+        QCOMPARE(backend->customBuildNames(), QStringList{"Old build"});
+        QCOMPARE(backend->customBuildAt(0).value("minecraftVersion").toString(), QStringLiteral("1.12.2"));
+        QVERIFY(QFile::exists(LauncherPaths::customBuildsFile()));
+        QVERIFY(!QFile::exists(LauncherPaths::legacyCustomBuildsFile()));
+        QVERIFY(QFile::exists(LauncherPaths::legacyCustomBuildsFile() + ".migrated"));
+        // Новые сборки получают id после старых.
+        backend->addCustomBuild("New", QString());
+        const QJsonArray builds = QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::customBuildsFile())).array();
+        QCOMPARE(builds.at(1).toObject().value("id").toInt(), 4);
+    }
+
+    void corruptFilesAreSetAsideAndReported()
+    {
+        Fixtures::write(LauncherPaths::profilesFile(), "{ this is not json");
+        Fixtures::write(LauncherPaths::customBuildsFile(), "{\"object\": \"not an array\"}");
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        QVERIFY(errors.wait(2000));   // сообщение откладывается до подключения интерфейса
+        const QString message = errors.constFirst().constFirst().toString();
+        QVERIFY(message.contains(QDir::toNativeSeparators(LauncherPaths::profilesFile() + ".bak")));
+        QVERIFY(QFile::exists(LauncherPaths::profilesFile() + ".bak"));
+        QVERIFY(QFile::exists(LauncherPaths::customBuildsFile() + ".bak"));
+        // Свежие файлы созданы заново и валидны.
+        QVERIFY(QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::profilesFile())).isArray());
+        QVERIFY(QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::customBuildsFile())).isArray());
+        QVERIFY(backend->profileNames().isEmpty());
+    }
+
+    void unusableBuildRecordsAreSkipped()
+    {
+        Fixtures::write(LauncherPaths::customBuildsFile(), QJsonDocument(QJsonArray{
+            QJsonObject{{"id", 1}, {"name", "  "}}, QJsonObject{{"id", 2}, {"name", "Good"}}}).toJson());
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        QVERIFY(errors.wait(2000));
+        QCOMPARE(backend->customBuildNames(), QStringList{"Good"});
+    }
+
+    // --- версии ------------------------------------------------------------------
+
+    void versionCatalogInstallAndRemove()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        mojang.publish({.id = "1.19.4", .releaseTime = "2023-03-14T12:00:00+00:00"});
+        Fixtures::write(m_game + "/versions/my-pack/my-pack.json", "{\"mainClass\":\"x\"}");
+
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->refreshVersionCatalog();
+        QVERIFY(waitFor([&] { return backend->versionCatalog().size() == 3; }));
+        const QVariantList catalog = backend->versionCatalog();
+        QCOMPARE(catalog.at(0).toMap().value("id").toString(), QStringLiteral("1.20.1"));
+        QCOMPARE(catalog.at(0).toMap().value("category").toString(), QStringLiteral("release"));
+        QVERIFY(!catalog.at(0).toMap().value("installed").toBool());
+        QCOMPARE(catalog.at(2).toMap().value("id").toString(), QStringLiteral("my-pack"));   // неизвестная манифесту
+        QCOMPARE(catalog.at(2).toMap().value("category").toString(), QStringLiteral("other"));
+
+        QSignalSpy installed(backend.get(), &LauncherBackend::installedVersionsChanged);
+        QVERIFY(installVersion(*backend, "1.20.1"));
+        QVERIFY(installed.count() > 0);
+        QVERIFY(backend->installedVersions().contains("1.20.1"));
+        QVERIFY(backend->versionCatalog().at(0).toMap().value("installed").toBool());
+
+        backend->addCustomBuild("Uses 1.20.1", QString(), "1.20.1");
+        const QVariantMap info = backend->versionRemovalInfo("1.20.1");
+        QVERIFY(info.value("installed").toBool());
+        QVERIFY(info.value("sizeMb").toInt() >= 1);
+        QCOMPARE(info.value("builds").toStringList(), QStringList{"Uses 1.20.1"});
+
+        backend->removeVersion("1.20.1");
+        QVERIFY(!backend->isVersionInstalled("1.20.1"));
+        QVERIFY(!QDir(m_game + "/versions/1.20.1").exists());
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+    }
+
+    void addingBuildWithVersionStartsDownload()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        auto backend = make();
+        backend->addCustomBuild("Auto", QString(), "1.20.1");
+        QVERIFY(backend->downloading());
+        QCOMPARE(backend->downloadVersion(), QStringLiteral("1.20.1"));
+        QVERIFY(waitFor([&] { return backend->isVersionInstalled("1.20.1") && !backend->downloading(); }));
+        QVERIFY(backend->checkInstallation(0).isEmpty());
+    }
+
+    void checkInstallationMessages()
+    {
+        auto backend = make();
+        QCOMPARE(backend->checkInstallation(0), QStringList{Loc::text("common.status.noBuildSelected")});
+        backend->addCustomBuild("Missing", QString());
+        QStringList issues = backend->checkInstallation(0);
+        QCOMPARE(issues.size(), 1);
+        QVERIFY(!issues.constFirst().isEmpty());
+    }
+
+    void downloadFailureIsReported()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        mojang.overrideFile("versions/1.20.1/1.20.1.jar", FakeResponse::error(404));
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->installVersion("1.20.1");
+        QVERIFY(errors.wait(30000));
+        QVERIFY(errors.constFirst().constFirst().toString().startsWith(
+            Loc::text("version.error.downloadFailed").arg("1.20.1", QString()).section(u'%', 0, 0)));
+        QVERIFY(waitIdle(*backend));
+    }
+
+    // --- запуск --------------------------------------------------------------
+
+    void launchValidationErrors()
+    {
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->launchGame(0, 0);
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("launch.error.noProfile"));
+        backend->addProfile("Steve", "steve", QString());
+        backend->launchGame(0, 0);
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("launch.error.noBuild"));
+        backend->addCustomBuild("B", QString());
+        backend->launchGame(0, 0);
+        QCOMPARE(errors.constLast().constFirst().toString(),
+                 Loc::text("launch.error.noVersionsInstalled").arg(QDir::toNativeSeparators(m_game + "/versions")));
+        QVERIFY(!backend->busy());
+    }
+
+    void offlineLaunchRunsJava()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString argsFile = m_game + "/../game-args.txt";
+        const QString java = fakeJava("jdk-launch", {"args_file=" + argsFile, "stdout=[Render thread/INFO]: Setting user: Steve"});
+        writeSettings({{"javaPath", java}, {"maxMemoryMb", 3072}, {"jvmArgs", "-Dtest.flag=1"}});
+
+        auto backend = make();
+        QVERIFY(installVersion(*backend, "1.20.1"));
+        backend->addProfile("Steve", "steve", QString());
+        backend->addCustomBuild("Server build", "play.example.com:25570", "1.20.1");
+        QVERIFY(waitIdle(*backend));
+
+        QSignalSpy launched(backend.get(), &LauncherBackend::launched);
+        QSignalSpy finished(backend.get(), &LauncherBackend::gameFinished);
+        QSignalSpy output(backend.get(), &LauncherBackend::gameOutput);
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->launchGame(0, 0);
+        QVERIFY2(waitFor([&] { return launched.count() + errors.count() > 0; }), "нет ни launched, ни launchError");
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QCOMPARE(launched.constFirst().at(0).toString(), QStringLiteral("Steve"));
+        QCOMPARE(launched.constFirst().at(1).toString(), QStringLiteral("Server build"));
+        QVERIFY(waitFor([&] { return finished.count() == 1; }));
+        QVERIFY(!backend->gameRunning());
+        QVERIFY(!backend->busy());
+        QVERIFY(strings(output).contains("[Render thread/INFO]: Setting user: Steve"));
+
+        const QStringList args = QString::fromLocal8Bit(Fixtures::readFile(argsFile)).split('\n', Qt::SkipEmptyParts);
+        QVERIFY(args.contains("-Xmx3072M"));
+        QVERIFY(args.contains("-Dtest.flag=1"));
+        QVERIFY(args.contains("net.minecraft.client.main.Main"));
+        const qsizetype server = args.indexOf("--server");
+        QVERIFY(server > 0);
+        QCOMPARE(args.at(server + 1), QStringLiteral("play.example.com"));
+        QCOMPARE(args.at(server + 3), QStringLiteral("25570"));
+    }
+
+    void elyLaunchWithTwoFactor()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        m_net.route(kInjectorManifest, FakeResponse::json(QJsonObject{{"download_url", kInjectorJar}}));
+        m_net.route(kInjectorJar, FakeResponse::bytes("injector"));
+        m_net.route(kElyAuth, [](const FakeRequest &request) {
+            const QJsonObject in = QJsonDocument::fromJson(request.body).object();
+            if (in.value("password").toString() == QLatin1String("pw:654321"))
+                return FakeResponse::json(QJsonObject{{"accessToken", "ely-token"},
+                                                      {"selectedProfile", QJsonObject{{"id", "aaaa-bbbb"}, {"name", "ElyNick"}}}});
+            return FakeResponse::json(QJsonObject{{"errorMessage", "Account protected with two factor auth."}}, 401);
+        });
+        const QString argsFile = m_game + "/../ely-args.txt";
+        writeSettings({{"javaPath", fakeJava("jdk-ely", {"args_file=" + argsFile})}});
+
+        auto backend = make();
+        QVERIFY(installVersion(*backend, "1.20.1"));
+        backend->addProfile("Ely", "ely@example.com", "pw", "elyby");
+        backend->addCustomBuild("B", QString(), "1.20.1");
+        QVERIFY(waitIdle(*backend));
+
+        QSignalSpy twoFactor(backend.get(), &LauncherBackend::twoFactorRequired);
+        QSignalSpy launched(backend.get(), &LauncherBackend::launched);
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->launchGame(0, 0);
+        QVERIFY(waitFor([&] { return twoFactor.count() + errors.count() > 0; }));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QCOMPARE(twoFactor.constFirst().constFirst().toString(), QStringLiteral("Ely"));
+        QVERIFY(!backend->busy());   // ждём ввода кода
+
+        backend->submitTwoFactorCode("  ");
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("auth.ely.error.enterCode"));
+        errors.clear();
+        backend->submitTwoFactorCode("654321");
+        QVERIFY(waitFor([&] { return launched.count() + errors.count() > 0; }));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+
+        QTRY_VERIFY_WITH_TIMEOUT(QFile::exists(argsFile), 15000);
+        QTRY_VERIFY_WITH_TIMEOUT(!backend->gameRunning(), 15000);
+        const QStringList args = QString::fromLocal8Bit(Fixtures::readFile(argsFile)).split('\n', Qt::SkipEmptyParts);
+        QVERIFY(args.constFirst().startsWith("-javaagent:"));
+        QVERIFY(args.constFirst().endsWith("=ely.by"));
+        QVERIFY(args.contains("ElyNick"));
+        QVERIFY(args.contains("ely-token"));
+        // Токен и ник запомнены — в следующий раз пароль не понадобится.
+        const QJsonObject profile = QJsonDocument::fromJson(Fixtures::readFile(LauncherPaths::profilesFile())).array().at(0).toObject();
+        QCOMPARE(profile.value("accessToken").toString(), QStringLiteral("ely-token"));
+        QCOMPARE(profile.value("resolvedName").toString(), QStringLiteral("ElyNick"));
+        QCOMPARE(profile.value("uuid").toString(), QStringLiteral("aaaabbbb"));
+    }
+
+    void microsoftProfileWithFreshTokenLaunchesOffline()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString argsFile = m_game + "/../ms-args.txt";
+        writeSettings({{"javaPath", fakeJava("jdk-ms", {"args_file=" + argsFile})}});
+        Fixtures::write(LauncherPaths::profilesFile(), QJsonDocument(QJsonArray{QJsonObject{
+            {"id", 1}, {"name", "MS"}, {"authType", "microsoft"}, {"clientToken", "c"},
+            {"accessToken", "mc-token"}, {"refreshToken", "r"}, {"uuid", "069a79f444e94726a5befca90e38aaf5"},
+            {"resolvedName", "Notch"}, {"xuid", "253"}, {"userType", "msa"},
+            {"tokenExpiry", QDateTime::currentDateTimeUtc().addSecs(3600).toString(Qt::ISODate)}}}).toJson());
+
+        auto backend = make();
+        QVERIFY(installVersion(*backend, "1.20.1"));
+        backend->addCustomBuild("B", QString(), "1.20.1");
+        QVERIFY(waitIdle(*backend));
+        const int requestsBefore = m_net.requests().size();
+
+        QSignalSpy launched(backend.get(), &LauncherBackend::launched);
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->launchGame(0, 0);
+        QVERIFY(waitFor([&] { return launched.count() + errors.count() > 0; }));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QCOMPARE(m_net.requests().size(), requestsBefore);   // токен жив — в Microsoft не ходили
+        QTRY_VERIFY_WITH_TIMEOUT(QFile::exists(argsFile), 15000);
+        const QStringList args = QString::fromLocal8Bit(Fixtures::readFile(argsFile)).split('\n', Qt::SkipEmptyParts);
+        QVERIFY(args.contains("Notch"));
+        QVERIFY(args.contains("mc-token"));
+    }
+
+    void microsoftProfileWithoutSessionAsksRelogin()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        Fixtures::write(LauncherPaths::profilesFile(), QJsonDocument(QJsonArray{QJsonObject{
+            {"id", 1}, {"name", "MS"}, {"authType", "microsoft"}}}).toJson());
+        auto backend = make();
+        QVERIFY(installVersion(*backend, "1.20.1"));
+        backend->addCustomBuild("B", QString(), "1.20.1");
+        QVERIFY(waitIdle(*backend));
+
+        QSignalSpy relogin(backend.get(), &LauncherBackend::microsoftReloginRequired);
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->launchGame(0, 0);
+        QCOMPARE(relogin.count(), 1);
+        QCOMPARE(relogin.constFirst().constFirst().toInt(), 0);
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("auth.msa.error.profileNeedsLogin").arg("MS"));
+        QVERIFY(!backend->busy());
+    }
+
+    void microsoftLoginNeedsWebEngine()
+    {
+        auto backend = make();
+        QSignalSpy failed(backend.get(), &LauncherBackend::microsoftLoginFailed);
+        backend->startMicrosoftLogin(-1);
+        QCOMPARE(failed.count(), 1);
+        QCOMPARE(failed.constFirst().constFirst().toString(), Loc::text("auth.msa.error.noWebEngine"));
+
+        const QVariantMap redirect = backend->inspectMicrosoftRedirect(
+            "https://login.live.com/oauth20_desktop.srf?code=abc");
+        QVERIFY(redirect.value("matched").toBool());
+        QCOMPARE(redirect.value("code").toString(), QStringLiteral("abc"));
+        QVERIFY(!backend->inspectMicrosoftRedirect("https://example.com/").value("matched").toBool());
+    }
+
+    // --- Java ----------------------------------------------------------------
+
+    void javaCatalogInstallSelectRemove()
+    {
+        const QByteArray zip = Fixtures::zipBytes({{QStringLiteral("jdk-21/bin/") + Fixtures::javaExecutableName(), "bin"}});
+        m_net.route("https://api.adoptium.net/v3/info/available_releases",
+                    FakeResponse::json(QJsonObject{{"available_lts_releases", QJsonArray{21}}, {"available_releases", QJsonArray{21}}}));
+        m_net.route("https://api.adoptium.net/v3/assets/feature_releases/*", [zip](const FakeRequest &request) {
+            const QString arch = request.queryItems().queryItemValue("architecture");
+            const QJsonObject binary{
+                {"architecture", arch}, {"image_type", "jdk"},
+                {"package", QJsonObject{{"name", "jdk.zip"}, {"link", "https://github.com/adoptium/x/jdk.zip"},
+                                        {"checksum", Fixtures::sha256(zip)}, {"size", zip.size()}}}};
+            const QJsonArray releases{QJsonObject{
+                {"release_name", "jdk-21.0.2+13"}, {"timestamp", "2025-01-20T00:00:00Z"},
+                {"binaries", QJsonArray{binary}},
+                {"version_data", QJsonObject{{"major", 21}, {"openjdk_version", "21.0.2+13-LTS"}}}}};
+            return FakeResponse::json(QJsonDocument(releases).toJson());
+        });
+        m_net.route("https://github.com/adoptium/x/jdk.zip", FakeResponse::bytes(zip));
+
+        auto backend = make();
+        QSignalSpy installedSpy(backend.get(), &LauncherBackend::javaRuntimeInstalled);
+        backend->refreshJavaCatalog();
+        QVERIFY(waitFor([&] { return !backend->javaCatalog().isEmpty() && !backend->javaCatalogLoading(); }));
+        const QVariantMap row = backend->javaCatalog().constFirst().toMap();
+        QCOMPARE(row.value("major").toInt(), 21);
+        QVERIFY(row.value("lts").toBool());
+        QVERIFY(!row.value("installed").toBool());
+        const QString id = row.value("id").toString();
+        QVERIFY(!backend->javaRuntimeInfo(id).value("installed").toBool());
+
+        backend->installJavaRuntime(id);
+        QVERIFY(waitFor([&] { return installedSpy.count() == 1; }));
+        QCOMPARE(installedSpy.constFirst().constFirst().toString(), id);
+        QVERIFY(backend->javaRuntimeInfo(id).value("installed").toBool());
+        QVERIFY(backend->javaCatalog().constFirst().toMap().value("installed").toBool());
+
+        // Выбранная сборка Java попадает в настройки, а при удалении настройка очищается.
+        backend->updateSettings({{"javaRuntime", id}});
+        const QString javaPath = backend->javaRuntimeInfo(id).value("javaPath").toString();
+        QVERIFY(backend->detectedJava().join('\n').contains(javaPath));
+        backend->removeJavaRuntime(id);
+        QVERIFY(backend->settings().value("javaRuntime").toString().isEmpty());
+        QVERIFY(!backend->javaRuntimeInfo(id).value("installed").toBool());
+
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->installJavaRuntime("no-such-runtime");
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("java.error.buildNotInCatalog").arg("no-such-runtime"));
+    }
+
+    // --- сезонные сборки --------------------------------------------------------
+
+    void seasonalBuildEndToEnd()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+
+        // Java 17 уже скачана лаунчером — шаг Java пропускается.
+        InstalledJavaRuntime runtime;
+        runtime.id = QStringLiteral("temurin-jdk-17-test");
+        runtime.kind = QStringLiteral("jdk");
+        runtime.major = 17;
+        runtime.version = QStringLiteral("17.0.8");
+        runtime.javaPath = Fixtures::installFakeJava(JavaRuntimeStore::dirFor(runtime.id), "17.0.8");
+        QVERIFY(JavaRuntimeStore::writeMeta(runtime, nullptr));
+
+        const auto publishSeason = [&](int revision, const QMap<QString, QByteArray> &files) {
+            const QByteArray pack = Fixtures::zipBytes(files);
+            const QString url = QStringLiteral("https://launcher-builds.galeonworx.com/packs/season-6-r%1.zip").arg(revision);
+            m_net.route(url, FakeResponse::bytes(pack));
+            const QJsonObject entry{
+                {"id", "season-6"}, {"name", "Season 6"}, {"revision", revision}, {"minecraftVersion", "1.20.1"},
+                {"loader", ""}, {"loaderVersion", ""}, {"modCount", files.size()}, {"seasonStart", "2026-01-01"},
+                {"serverUrl", "season6.example.com"}, {"javaMajor", 17},
+                {"archive", QJsonObject{{"url", url}, {"size", pack.size()}, {"sha256", Fixtures::sha256(pack)}}}};
+            m_net.route(kSeasonalIndex, FakeResponse::json(QJsonObject{{"formatVersion", 1}, {"builds", QJsonArray{entry}}}));
+        };
+        publishSeason(1, {{"mods/a.jar", "a1"}, {"mods/old.jar", "old"}, {"config/c.toml", "c=1"}});
+
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        QSignalSpy done(backend.get(), &LauncherBackend::seasonalInstallFinished);
+        backend->refreshSeasonalCatalog();
+        QVERIFY(waitFor([&] { return backend->seasonalCatalog().size() == 1; }));
+        QVariantMap row = backend->seasonalCatalog().constFirst().toMap();
+        QCOMPARE(row.value("status").toString(), Loc::text("seasonal.status.notInstalled"));
+        QCOMPARE(row.value("loaderTitle").toString(), Loc::text("loader.label.vanilla"));
+        QCOMPARE(row.value("seasonStart").toString(), QStringLiteral("01.01.2026"));
+
+        backend->installSeasonalBuild("season-6");
+        QVERIFY(backend->seasonalInstalling());
+        QVERIFY(backend->busy());
+        QVERIFY(waitFor([&] { return done.count() + errors.count() > 0; }, 60000));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QCOMPARE(done.constFirst().at(0).toString(), QStringLiteral("season-6"));
+        QVERIFY(!backend->seasonalInstalling());
+        QVERIFY(waitIdle(*backend));
+
+        // Сборка заведена, активна, версия игры стоит, файлы пака разложены, ревизия записана.
+        QCOMPARE(backend->customBuildNames(), QStringList{"Season 6"});
+        QCOMPARE(backend->activeBuildIndex(), 0);
+        QVERIFY(backend->checkInstallation(0).isEmpty());
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/a.jar"), QByteArray("a1"));
+        QCOMPARE(Fixtures::readFile(m_game + "/config/c.toml"), QByteArray("c=1"));
+        const QVariantMap build = backend->customBuildAt(0);
+        QCOMPARE(build.value("seasonalId").toString(), QStringLiteral("season-6"));
+        QCOMPARE(build.value("seasonalRevision").toInt(), 1);
+        QCOMPARE(build.value("serverUrl").toString(), QStringLiteral("season6.example.com"));
+        const int buildId = Fixtures::readJsonFile(LauncherPaths::settingsFile()).value("activeBuildId").toInt();
+        const QJsonObject state = Fixtures::readJsonFile(LauncherPaths::seasonalStateFile(buildId));
+        QCOMPARE(state.value("revision").toInt(), 1);
+        QCOMPARE(state.value("entries").toArray().size(), 3);
+        QCOMPARE(backend->seasonalCatalog().constFirst().toMap().value("status").toString(),
+                 Loc::text("seasonal.status.installed"));
+
+        // Ревизия 2: мод old.jar из сборки убрали, a.jar обновили. Пользовательский мир не трогаем.
+        Fixtures::write(m_game + "/saves/MyWorld/level.dat", "mine");
+        publishSeason(2, {{"mods/a.jar", "a2"}, {"config/c.toml", "c=2"}});
+        backend->refreshSeasonalCatalog(true);
+        QVERIFY(waitFor([&] { return backend->seasonalCatalog().constFirst().toMap().value("updateAvailable").toBool(); }));
+        done.clear();
+        backend->installSeasonalBuild("season-6");
+        QVERIFY(waitFor([&] { return done.count() + errors.count() > 0; }, 60000));
+        QVERIFY2(errors.isEmpty(), qPrintable(strings(errors).join('\n')));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/a.jar"), QByteArray("a2"));
+        QVERIFY(!QFile::exists(m_game + "/mods/old.jar"));
+        QCOMPARE(Fixtures::readFile(m_game + "/saves/MyWorld/level.dat"), QByteArray("mine"));
+        QCOMPARE(backend->customBuildNames().size(), 1);   // та же запись, а не вторая
+        QCOMPARE(backend->customBuildAt(0).value("seasonalRevision").toInt(), 2);
+        // Служебный файл пака за собой не оставляем.
+        QVERIFY(QDir(LauncherPaths::buildDir(buildId)).entryList({".pack-*"}, QDir::Files | QDir::Hidden).isEmpty());
+    }
+
+    void seasonalPackChecksumFailureAborts()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        InstalledJavaRuntime runtime;
+        runtime.id = QStringLiteral("temurin-jdk-17-test2");
+        runtime.kind = QStringLiteral("jdk");
+        runtime.major = 17;
+        runtime.version = QStringLiteral("17.0.8");
+        runtime.javaPath = Fixtures::installFakeJava(JavaRuntimeStore::dirFor(runtime.id), "17.0.8");
+        QVERIFY(JavaRuntimeStore::writeMeta(runtime, nullptr));
+
+        const QString url = QStringLiteral("https://launcher-builds.galeonworx.com/packs/bad.zip");
+        m_net.route(url, FakeResponse::bytes("not what was promised"));
+        const QJsonObject entry{
+            {"id", "bad-season"}, {"name", "Bad"}, {"revision", 1}, {"minecraftVersion", "1.20.1"},
+            {"loader", ""}, {"javaMajor", 17},
+            {"archive", QJsonObject{{"url", url}, {"size", 21}, {"sha256", QString(64, u'0')}}}};
+        m_net.route(kSeasonalIndex, FakeResponse::json(QJsonObject{{"formatVersion", 1}, {"builds", QJsonArray{entry}}}));
+
+        auto backend = make();
+        QSignalSpy errors(backend.get(), &LauncherBackend::launchError);
+        backend->refreshSeasonalCatalog();
+        QVERIFY(waitFor([&] { return backend->seasonalCatalog().size() == 1; }));
+        backend->installSeasonalBuild("bad-season");
+        QVERIFY(waitFor([&] { return !backend->seasonalInstalling(); }, 60000));
+        const QString all = strings(errors).join('\n');
+        QVERIFY2(all.contains(Loc::text("seasonal.error.checksumMismatch")), qPrintable(all));
+        QVERIFY(!backend->busy());
+        QCOMPARE(backend->customBuildAt(0).value("seasonalRevision").toInt(), 0);   // не отмечена установленной
+
+        backend->installSeasonalBuild("unknown-id");
+        QCOMPARE(errors.constLast().constFirst().toString(), Loc::text("seasonal.error.notInCatalog").arg("unknown-id"));
+    }
+};
+
+BILAUNCHER_GUI_TEST_MAIN(TestLauncherBackend)
+#include "tst_launcherbackend.moc"
@@ -0,0 +1,410 @@
+#include "fakeinternet.h"
+
+#include "fixtures.h"
+
+#include <QEventLoop>
+#include <QHostAddress>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QNetworkProxy>
+#include <QSslConfiguration>
+#include <QSslKey>
+#include <QSslSocket>
+#include <QTimer>
+
+struct FakeInternet::Connection
+{
+    QSslSocket *socket = nullptr;
+    QByteArray buffer;
+    QString tunnelHost;     // непусто — внутри CONNECT-туннеля (https)
+};
+
+namespace {
+
+QByteArray reasonPhrase(int status)
+{
+    switch (status) {
+    case 200: return "OK";
+    case 201: return "Created";
+    case 204: return "No Content";
+    case 301: return "Moved Permanently";
+    case 302: return "Found";
+    case 304: return "Not Modified";
+    case 400: return "Bad Request";
+    case 401: return "Unauthorized";
+    case 403: return "Forbidden";
+    case 404: return "Not Found";
+    case 410: return "Gone";
+    case 429: return "Too Many Requests";
+    case 500: return "Internal Server Error";
+    case 502: return "Bad Gateway";
+    case 503: return "Service Unavailable";
+    default:  return "Status";
+    }
+}
+
+} // namespace
+
+QUrl FakeRequest::url() const
+{
+    QUrl result;
+    result.setScheme(scheme);
+    result.setHost(host);
+    result.setPath(path);
+    if (!query.isEmpty())
+        result.setQuery(query);
+    return result;
+}
+
+FakeResponse FakeResponse::json(const QByteArray &body, int status)
+{
+    FakeResponse response;
+    response.status = status;
+    response.body = body;
+    response.contentType = "application/json";
+    return response;
+}
+
+FakeResponse FakeResponse::json(const QJsonObject &object, int status)
+{
+    return json(QJsonDocument(object).toJson(QJsonDocument::Compact), status);
+}
+
+FakeResponse FakeResponse::text(const QByteArray &body, int status)
+{
+    FakeResponse response;
+    response.status = status;
+    response.body = body;
+    response.contentType = "text/plain; charset=utf-8";
+    return response;
+}
+
+FakeResponse FakeResponse::bytes(const QByteArray &body)
+{
+    FakeResponse response;
+    response.body = body;
+    return response;
+}
+
+FakeResponse FakeResponse::error(int status, const QByteArray &body)
+{
+    FakeResponse response = text(body.isEmpty() ? reasonPhrase(status) : body, status);
+    return response;
+}
+
+FakeInternet::FakeInternet(QObject *parent)
+    : QTcpServer(parent)
+{
+    m_fallback = FakeResponse::error(404, "fake internet: no route");
+}
+
+FakeInternet::~FakeInternet()
+{
+    stop();
+}
+
+bool FakeInternet::tlsAvailable(QString *why)
+{
+    if (!QSslSocket::supportsSsl()) {
+        if (why)
+            *why = QStringLiteral("в этой сборке Qt нет рабочего TLS-бэкенда");
+        return false;
+    }
+    return true;
+}
+
+bool FakeInternet::start(QString *error)
+{
+    if (m_started)
+        return true;
+    if (!tlsAvailable(error))
+        return false;
+
+    m_certificate = Fixtures::read(QStringLiteral("tls/cert.pem"));
+    m_key = Fixtures::read(QStringLiteral("tls/key.pem"));
+
+    if (!listen(QHostAddress::LocalHost, 0)) {
+        if (error)
+            *error = errorString();
+        return false;
+    }
+
+    QNetworkProxy::setApplicationProxy(
+        QNetworkProxy(QNetworkProxy::HttpProxy, QStringLiteral("127.0.0.1"), serverPort()));
+
+    QSslConfiguration ssl = QSslConfiguration::defaultConfiguration();
+    ssl.setPeerVerifyMode(QSslSocket::VerifyNone);
+    QSslConfiguration::setDefaultConfiguration(ssl);
+
+    m_started = true;
+
+    // Самопроверка: TLS-бэкенд может не уметь серверный режим (бывает на
+    // отдельных сборках Qt под Windows/macOS). Лучше узнать сразу и внятно,
+    // чем получить десятки непонятных падений в тестах сервисов.
+    const QString probe = QStringLiteral("https://selftest.fake-internet.test/ping");
+    route(probe, FakeResponse::text("pong"));
+    QNetworkAccessManager manager;
+    QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(probe)));
+    QEventLoop loop;
+    QTimer::singleShot(10000, &loop, &QEventLoop::quit);
+    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
+    if (!reply->isFinished())
+        loop.exec();
+    const bool ok = reply->isFinished() && reply->error() == QNetworkReply::NoError
+                    && reply->readAll() == "pong";
+    const QString why = reply->isFinished() ? reply->errorString() : QStringLiteral("таймаут 10 с");
+    delete reply;
+    reset();
+    if (!ok) {
+        stop();
+        if (error)
+            *error = QStringLiteral("TLS через локальный прокси не заработал (%1), TLS-бэкенд: %2")
+                         .arg(why, QSslSocket::activeBackend());
+        return false;
+    }
+    return true;
+}
+
+void FakeInternet::stop()
+{
+    if (!m_started)
+        return;
+    // Никуда наружу и после остановки: прокси на закрытый порт.
+    close();
+    m_started = false;
+}
+
+void FakeInternet::route(const QString &pattern, const Handler &handler)
+{
+    unroute(pattern);
+    const QUrl url(pattern.endsWith(u'*') ? pattern.chopped(1) : pattern);
+    Route route;
+    route.pattern = pattern;
+    route.host = url.host().toLower();
+    route.path = url.path().isEmpty() ? QStringLiteral("/") : url.path();
+    route.prefix = pattern.endsWith(u'*');
+    route.handler = handler;
+    m_routes << route;
+}
+
+void FakeInternet::route(const QString &pattern, const FakeResponse &response)
+{
+    route(pattern, [response](const FakeRequest &) { return response; });
+}
+
+void FakeInternet::unroute(const QString &pattern)
+{
+    m_routes.removeIf([&](const Route &route) { return route.pattern == pattern; });
+}
+
+void FakeInternet::reset()
+{
+    m_routes.clear();
+    m_requests.clear();
+    m_unmatched.clear();
+    m_fallback = FakeResponse::error(404, "fake internet: no route");
+}
+
+QList<FakeRequest> FakeInternet::requests() const
+{
+    return m_requests;
+}
+
+int FakeInternet::hits(const QString &url) const
+{
+    const QUrl wanted(url);
+    int count = 0;
+    for (const FakeRequest &request : m_requests) {
+        if (request.host.compare(wanted.host(), Qt::CaseInsensitive) == 0
+            && request.path == wanted.path())
+            ++count;
+    }
+    return count;
+}
+
+QStringList FakeInternet::unmatched() const
+{
+    return m_unmatched;
+}
+
+QStringList FakeInternet::requestedUrls() const
+{
+    QStringList result;
+    for (const FakeRequest &request : m_requests)
+        result << request.url().toString();
+    return result;
+}
+
+void FakeInternet::incomingConnection(qintptr descriptor)
+{
+    auto *socket = new QSslSocket(this);
+    if (!socket->setSocketDescriptor(descriptor)) {
+        delete socket;
+        return;
+    }
+
+    auto *connection = new Connection;
+    connection->socket = socket;
+
+    connect(socket, &QSslSocket::readyRead, this, [this, connection] { onReadyRead(connection); });
+    connect(socket, &QSslSocket::sslErrors, socket, [socket](const QList<QSslError> &) {
+        socket->ignoreSslErrors();
+    });
+    // Удаляем отложенно: disconnected может прийти синхронно посреди processBuffer().
+    connect(socket, &QSslSocket::disconnected, this, [socket, connection] {
+        socket->deleteLater();
+        QObject::connect(socket, &QObject::destroyed, [connection] { delete connection; });
+    });
+}
+
+void FakeInternet::onReadyRead(Connection *connection)
+{
+    connection->buffer += connection->socket->readAll();
+    processBuffer(connection);
+}
+
+void FakeInternet::processBuffer(Connection *connection)
+{
+    for (;;) {
+        const qsizetype headerEnd = connection->buffer.indexOf("\r\n\r\n");
+        if (headerEnd < 0)
+            return;
+
+        const QList<QByteArray> lines = connection->buffer.left(headerEnd).split('\n');
+        const QList<QByteArray> requestLine = lines.value(0).trimmed().split(' ');
+        if (requestLine.size() < 2) {
+            connection->socket->abort();
+            return;
+        }
+
+        FakeRequest request;
+        request.method = requestLine.at(0);
+        for (qsizetype i = 1; i < lines.size(); ++i) {
+            const QByteArray line = lines.at(i).trimmed();
+            const qsizetype colon = line.indexOf(':');
+            if (colon > 0)
+                request.headers.insert(line.left(colon).trimmed().toLower(),
+                                       line.mid(colon + 1).trimmed());
+        }
+
+        const qsizetype bodySize = request.headers.value("content-length", "0").toLongLong();
+        if (connection->buffer.size() < headerEnd + 4 + bodySize)
+            return;   // тело ещё не дошло
+        request.body = connection->buffer.mid(headerEnd + 4, bodySize);
+        connection->buffer.remove(0, headerEnd + 4 + bodySize);
+
+        const QByteArray target = requestLine.at(1);
+
+        if (request.method == "CONNECT" && connection->tunnelHost.isEmpty()) {
+            QString host = QString::fromLatin1(target);
+            host = host.left(host.lastIndexOf(u':')).toLower();
+            connection->tunnelHost = host;
+            connection->socket->write("HTTP/1.1 200 Connection Established\r\n\r\n");
+            connection->socket->flush();
+            startTls(connection);
+            continue;
+        }
+
+        if (!connection->tunnelHost.isEmpty()) {
+            request.scheme = QStringLiteral("https");
+            request.host = connection->tunnelHost;
+            const QUrl relative(QString::fromLatin1(target));
+            request.path = relative.path(QUrl::FullyDecoded);
+            request.query = relative.query(QUrl::FullyEncoded);
+        } else {
+            // Простой http через прокси — адрес в absolute-form.
+            const QUrl absolute(QString::fromLatin1(target));
+            request.scheme = absolute.scheme();
+            request.host = absolute.host().toLower();
+            request.path = absolute.path(QUrl::FullyDecoded);
+            request.query = absolute.query(QUrl::FullyEncoded);
+        }
+        if (request.path.isEmpty())
+            request.path = QStringLiteral("/");
+
+        dispatch(connection, request);
+    }
+}
+
+void FakeInternet::startTls(Connection *connection)
+{
+    QSslSocket *socket = connection->socket;
+    socket->setLocalCertificate(QSslCertificate(m_certificate, QSsl::Pem));
+    socket->setPrivateKey(QSslKey(m_key, QSsl::Rsa, QSsl::Pem));
+    socket->setPeerVerifyMode(QSslSocket::VerifyNone);
+    socket->startServerEncryption();
+}
+
+const FakeInternet::Route *FakeInternet::match(const FakeRequest &request) const
+{
+    // Последний добавленный маршрут главнее: тест может перекрыть общий частным.
+    for (qsizetype i = m_routes.size() - 1; i >= 0; --i) {
+        const Route &route = m_routes.at(i);
+        if (route.host != request.host)
+            continue;
+        if (route.prefix ? request.path.startsWith(route.path) : request.path == route.path)
+            return &route;
+    }
+    return nullptr;
+}
+
+void FakeInternet::dispatch(Connection *connection, FakeRequest request)
+{
+    m_requests << request;
+    const QString url = request.url().toString();
+
+    FakeResponse response;
+    if (const Route *route = match(request)) {
+        response = route->handler(request);
+    } else {
+        m_unmatched << url;
+        qWarning("FakeInternet: нет маршрута для %s %s", request.method.constData(),
+                 qPrintable(url));
+        response = m_fallback;
+    }
+
+    const bool keepAlive = request.header("connection").toLower() != "close";
+    QPointer<QTcpSocket> socket(connection->socket);
+    if (response.hang)
+        return;
+    if (response.delayMs > 0) {
+        QTimer::singleShot(response.delayMs, this,
+                           [this, socket, response, keepAlive] { respond(socket, response, keepAlive); });
+    } else {
+        respond(socket, response, keepAlive);
+    }
+    emit requestServed(url);
+}
+
+void FakeInternet::respond(QPointer<QTcpSocket> socket, const FakeResponse &response, bool keepAlive)
+{
+    if (!socket || socket->state() != QAbstractSocket::ConnectedState)
+        return;
+    if (response.drop) {
+        socket->abort();
+        return;
+    }
+
+    QByteArray head = "HTTP/1.1 " + QByteArray::number(response.status) + ' '
+                      + reasonPhrase(response.status) + "\r\n";
+    head += "Content-Type: " + response.contentType + "\r\n";
+    head += "Content-Length: " + QByteArray::number(response.body.size()) + "\r\n";
+    for (const auto &[name, value] : response.headers)
+        head += name + ": " + value + "\r\n";
+    const bool close = !keepAlive || response.truncateTo >= 0;
+    head += close ? "Connection: close\r\n" : "Connection: keep-alive\r\n";
+    head += "\r\n";
+
+    socket->write(head);
+    if (response.truncateTo >= 0) {
+        socket->write(response.body.left(response.truncateTo));
+        socket->flush();
+        socket->disconnectFromHost();
+        return;
+    }
+    socket->write(response.body);
+    if (close)
+        socket->disconnectFromHost();
+}
@@ -0,0 +1,136 @@
+#pragma once
+
+// «Фейковый интернет» для тестов сетевых сервисов без правки их кода.
+//
+// Сервисы лаунчера ходят на захардкоженные https-адреса через собственные
+// QNetworkAccessManager. Прокси и SSL-конфигурация по умолчанию у Qt общие
+// на весь процесс, поэтому start():
+//   - ставит QNetworkProxy::setApplicationProxy() на локальный порт;
+//   - отключает проверку сертификата в QSslConfiguration::defaultConfiguration().
+// Дальше каждое https-соединение приходит сюда как CONNECT host:443; сокет
+// переводится в TLS с тестовым самоподписанным сертификатом и обслуживается
+// как обычный HTTP/1.1 — по таблице маршрутов (host + path).
+//
+// Запрос на неизвестный адрес получает 404 и попадает в unmatched(): тест
+// может проверить, что код не ушёл куда-то, куда не ожидали.
+
+#include <QByteArray>
+#include <QHash>
+#include <QList>
+#include <QMutex>
+#include <QObject>
+#include <QPair>
+#include <QPointer>
+#include <QString>
+#include <QStringList>
+#include <QTcpServer>
+#include <QUrl>
+#include <QUrlQuery>
+
+#include <functional>
+
+class QSslSocket;
+class QTcpSocket;
+
+struct FakeRequest
+{
+    QByteArray method;
+    QString scheme;          // https | http
+    QString host;
+    QString path;
+    QString query;           // без «?»
+    QHash<QByteArray, QByteArray> headers;   // имена в нижнем регистре
+    QByteArray body;
+
+    QUrl url() const;
+    QUrlQuery queryItems() const { return QUrlQuery(query); }
+    QUrlQuery formItems() const { return QUrlQuery(QString::fromUtf8(body)); }
+    QByteArray header(const QByteArray &name) const { return headers.value(name.toLower()); }
+};
+
+struct FakeResponse
+{
+    int status = 200;
+    QByteArray body;
+    QByteArray contentType = "application/octet-stream";
+    QList<QPair<QByteArray, QByteArray>> headers;
+    int delayMs = 0;               // ответить с задержкой
+    bool hang = false;             // не отвечать вовсе (для отмены и таймаутов)
+    bool drop = false;             // оборвать соединение без ответа
+    int truncateTo = -1;           // объявить полный размер, отдать столько байт и оборвать
+
+    static FakeResponse json(const QByteArray &body, int status = 200);
+    static FakeResponse json(const class QJsonObject &object, int status = 200);
+    static FakeResponse text(const QByteArray &body, int status = 200);
+    static FakeResponse bytes(const QByteArray &body);
+    static FakeResponse error(int status, const QByteArray &body = {});
+};
+
+class FakeInternet : public QTcpServer
+{
+    Q_OBJECT
+
+public:
+    using Handler = std::function<FakeResponse(const FakeRequest &)>;
+
+    explicit FakeInternet(QObject *parent = nullptr);
+    ~FakeInternet() override;
+
+    // Слушает 127.0.0.1 и перенаправляет на себя весь трафик процесса.
+    // При ошибке пишет причину в error (например, нет TLS-бэкенда с поддержкой сервера).
+    bool start(QString *error = nullptr);
+    void stop();
+
+    // Есть ли TLS вообще (без него сетевые тесты пропускаются).
+    static bool tlsAvailable(QString *why = nullptr);
+
+    // Маршрут: "https://host/path" — точное совпадение пути (query не учитывается),
+    // "https://host/prefix/*" — всё, что начинается с prefix/.
+    void route(const QString &pattern, const Handler &handler);
+    void route(const QString &pattern, const FakeResponse &response);
+    void unroute(const QString &pattern);
+
+    // Ответ на всё, что не подошло ни к одному маршруту (по умолчанию 404).
+    void setFallback(const FakeResponse &response) { m_fallback = response; }
+
+    // Сбросить маршруты и журнал.
+    void reset();
+
+    QList<FakeRequest> requests() const;
+    // Сколько раз был запрошен адрес "https://host/path" (query не учитывается).
+    int hits(const QString &url) const;
+    QStringList unmatched() const;
+    QStringList requestedUrls() const;
+
+signals:
+    void requestServed(const QString &url);
+
+protected:
+    void incomingConnection(qintptr descriptor) override;
+
+private:
+    struct Connection;
+    struct Route
+    {
+        QString pattern;
+        QString host;
+        QString path;
+        bool prefix = false;
+        Handler handler;
+    };
+
+    void onReadyRead(Connection *connection);
+    void processBuffer(Connection *connection);
+    void dispatch(Connection *connection, FakeRequest request);
+    void respond(QPointer<QTcpSocket> socket, const FakeResponse &response, bool keepAlive);
+    void startTls(Connection *connection);
+    const Route *match(const FakeRequest &request) const;
+
+    QList<Route> m_routes;
+    FakeResponse m_fallback;
+    QList<FakeRequest> m_requests;
+    QStringList m_unmatched;
+    QByteArray m_certificate;
+    QByteArray m_key;
+    bool m_started = false;
+};
@@ -0,0 +1,194 @@
+#include "fakemojang.h"
+
+#include "fixtures.h"
+
+#include "minecraftversion.h"
+
+#include <QJsonArray>
+#include <QJsonDocument>
+
+namespace {
+
+const QString kMeta = QStringLiteral("https://piston-meta.mojang.com/v1/packages/");
+const QString kData = QStringLiteral("https://piston-data.mojang.com/v1/objects/");
+const QString kLibraries = QStringLiteral("https://libraries.minecraft.net/");
+const QString kResources = QStringLiteral("https://resources.download.minecraft.net/");
+
+QJsonObject download(const QString &url, const QByteArray &data, const QString &path = {})
+{
+    QJsonObject object{{"url", url}, {"sha1", Fixtures::sha1(data)}, {"size", data.size()}};
+    if (!path.isEmpty())
+        object.insert("path", path);
+    return object;
+}
+
+} // namespace
+
+FakeMojang::FakeMojang(FakeInternet &net)
+    : m_net(net)
+{
+}
+
+QString FakeMojang::manifestUrl()
+{
+    return QStringLiteral("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json");
+}
+
+QString FakeMojang::addObject(const QString &relativePath, const QByteArray &data)
+{
+    QString url;
+    if (relativePath.startsWith(QLatin1String("libraries/")))
+        url = kLibraries + relativePath.mid(int(sizeof("libraries/") - 1));
+    else if (relativePath.startsWith(QLatin1String("assets/objects/")))
+        url = kResources + relativePath.mid(int(sizeof("assets/objects/") - 1));
+    else
+        url = kData + Fixtures::sha1(data) + u'/' + relativePath.section(u'/', -1);
+
+    m_files.insert(relativePath, {url, data});
+    m_net.route(url, FakeResponse::bytes(data));
+    return url;
+}
+
+void FakeMojang::overrideFile(const QString &relativePath, const FakeResponse &response)
+{
+    m_net.route(m_files.value(relativePath).url, response);
+}
+
+QString FakeMojang::fileUrl(const QString &relativePath) const
+{
+    return m_files.value(relativePath).url;
+}
+
+void FakeMojang::publish(const VersionSpec &spec)
+{
+    QHash<QString, QByteArray> expected;
+    QJsonObject json{{"id", spec.id}, {"type", spec.type}, {"releaseTime", spec.releaseTime}};
+
+    if (!spec.inheritsFrom.isEmpty()) {
+        json.insert("inheritsFrom", spec.inheritsFrom);
+        json.insert("mainClass", "net.fabricmc.loader.impl.launch.knot.KnotClient");
+        const QString libPath = QStringLiteral("net/fabricmc/fabric-loader/0.16.10/fabric-loader-0.16.10.jar");
+        const QByteArray libData = "fabric-loader-" + spec.id.toUtf8();
+        const QString url = addObject("libraries/" + libPath, libData);
+        json.insert("libraries", QJsonArray{QJsonObject{
+                                     {"name", "net.fabricmc:fabric-loader:0.16.10"},
+                                     {"downloads", QJsonObject{{"artifact", download(url, libData, libPath)}}}}});
+        expected.insert("libraries/" + libPath, libData);
+    } else {
+        json.insert("mainClass", "net.minecraft.client.main.Main");
+        json.insert("arguments", QJsonObject{
+            {"game", QJsonArray{"--username", "${auth_player_name}", "--version", "${version_name}",
+                                "--gameDir", "${game_directory}", "--assetsDir", "${assets_root}",
+                                "--assetIndex", "${assets_index_name}", "--uuid", "${auth_uuid}",
+                                "--accessToken", "${auth_access_token}", "--userType", "${user_type}",
+                                "--versionType", "${version_type}"}},
+            {"jvm", QJsonArray{"-Djava.library.path=${natives_directory}", "-cp", "${classpath}"}}});
+        json.insert("javaVersion", QJsonObject{{"component", "java-runtime-gamma"}, {"majorVersion", spec.javaMajor}});
+
+        // client.jar
+        const QString clientPath = "versions/" + spec.id + u'/' + spec.id + ".jar";
+        const QByteArray clientData = "client-jar-of-" + spec.id.toUtf8();
+        const QString clientUrl = addObject(clientPath, clientData);
+        json.insert("downloads", QJsonObject{{"client", download(clientUrl, clientData)}});
+        expected.insert(clientPath, clientData);
+
+        // Обычная библиотека и натив под текущую платформу.
+        const QString native = VersionLoader::nativeClassifier();
+        const QString libPath = QStringLiteral("com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar");
+        const QByteArray libData = "brigadier";
+        const QString nativePath = QStringLiteral("org/lwjgl/lwjgl/3.3.1/lwjgl-3.3.1-%1.jar").arg(native);
+        const QByteArray nativeData = Fixtures::zipBytes({{"liblwjgl.so", "so"}, {"lwjgl.dll", "dll"},
+                                                          {"liblwjgl.dylib", "dylib"}});
+        const QString libUrl = addObject("libraries/" + libPath, libData);
+        const QString nativeUrl = addObject("libraries/" + nativePath, nativeData);
+        json.insert("libraries", QJsonArray{
+            QJsonObject{{"name", "com.mojang:brigadier:1.1.8"},
+                        {"downloads", QJsonObject{{"artifact", download(libUrl, libData, libPath)}}}},
+            QJsonObject{{"name", "org.lwjgl:lwjgl:3.3.1:" + native},
+                        {"downloads", QJsonObject{{"artifact", download(nativeUrl, nativeData, nativePath)}}},
+                        {"rules", QJsonArray{QJsonObject{{"action", "allow"},
+                                                         {"os", QJsonObject{{"name", VersionLoader::osName()}}}}}}}});
+        expected.insert("libraries/" + libPath, libData);
+        expected.insert("libraries/" + nativePath, nativeData);
+
+        // Ассеты.
+        const QString indexId = spec.legacyAssets ? QStringLiteral("legacy") : spec.id + "-assets";
+        QJsonObject objects;
+        qint64 total = 0;
+        for (const QString &name : {QStringLiteral("minecraft/sounds/click.ogg"), QStringLiteral("icons/icon_16x16.png")}) {
+            const QByteArray data = (name + "@" + spec.id).toUtf8();
+            const QString hash = Fixtures::sha1(data);
+            const QString objectPath = "assets/objects/" + hash.left(2) + u'/' + hash;
+            addObject(objectPath, data);
+            objects.insert(name, QJsonObject{{"hash", hash}, {"size", data.size()}});
+            expected.insert(objectPath, data);
+            if (spec.legacyAssets)
+                expected.insert("assets/virtual/legacy/" + name, data);
+            total += data.size();
+        }
+        QJsonObject index{{"objects", objects}};
+        if (spec.legacyAssets)
+            index.insert("virtual", true);
+        const QByteArray indexData = QJsonDocument(index).toJson(QJsonDocument::Compact);
+        const QString indexPath = "assets/indexes/" + indexId + ".json";
+        const QString indexUrl = addObject(indexPath, indexData);
+        QJsonObject assetIndex = download(indexUrl, indexData);
+        assetIndex.insert("id", indexId);
+        assetIndex.insert("totalSize", total);
+        json.insert("assetIndex", assetIndex);
+        json.insert("assets", indexId);
+        expected.insert(indexPath, indexData);
+
+        // Конфиг логирования.
+        const QByteArray logData = "<Configuration/>";
+        const QString logPath = QStringLiteral("assets/log_configs/client-1.12.xml");
+        const QString logUrl = addObject(logPath, logData);
+        QJsonObject logFile = download(logUrl, logData);
+        logFile.insert("id", "client-1.12.xml");
+        json.insert("logging", QJsonObject{{"client", QJsonObject{
+                                               {"argument", "-Dlog4j.configurationFile=${path}"},
+                                               {"file", logFile}, {"type", "log4j2-xml"}}}});
+        expected.insert(logPath, logData);
+    }
+
+    const QByteArray jsonData = QJsonDocument(json).toJson(QJsonDocument::Compact);
+    m_versionJson.insert(spec.id, jsonData);
+    expected.insert("versions/" + spec.id + u'/' + spec.id + ".json", jsonData);
+    m_expected.insert(spec.id, expected);
+    m_net.route(versionJsonUrl(spec.id), FakeResponse::json(jsonData));
+
+    m_specs.removeIf([&](const VersionSpec &s) { return s.id == spec.id; });
+    m_specs << spec;
+    routeManifest();
+}
+
+QString FakeMojang::versionJsonUrl(const QString &id) const
+{
+    return kMeta + Fixtures::sha1(m_versionJson.value(id)) + u'/' + id + ".json";
+}
+
+QByteArray FakeMojang::versionJson(const QString &id) const
+{
+    return m_versionJson.value(id);
+}
+
+void FakeMojang::routeManifest()
+{
+    QJsonArray versions;
+    for (const VersionSpec &spec : std::as_const(m_specs)) {
+        if (!spec.listed)
+            continue;
+        versions << QJsonObject{{"id", spec.id},
+                                {"type", spec.type},
+                                {"url", versionJsonUrl(spec.id)},
+                                {"sha1", Fixtures::sha1(m_versionJson.value(spec.id))},
+                                {"releaseTime", spec.releaseTime},
+                                {"time", spec.releaseTime}};
+    }
+    m_net.route(manifestUrl(), FakeResponse::json(QJsonObject{{"versions", versions}}));
+}
+
+QHash<QString, QByteArray> FakeMojang::expectedFiles(const QString &id) const
+{
+    return m_expected.value(id);
+}
@@ -0,0 +1,64 @@
+#pragma once
+
+// Миниатюрный Mojang для FakeInternet: манифест версий, json версий, client.jar,
+// библиотеки (в т.ч. натив под текущую ОС), индекс ассетов, сами ассеты и
+// конфиг логирования. Содержимое крошечное, но устроено как настоящее —
+// VersionInstaller и GameLauncher работают с ним без поблажек.
+
+#include "fakeinternet.h"
+
+#include <QByteArray>
+#include <QHash>
+#include <QJsonObject>
+#include <QString>
+#include <QStringList>
+
+class FakeMojang
+{
+public:
+    struct VersionSpec
+    {
+        QString id;
+        QString type = QStringLiteral("release");
+        QString inheritsFrom;            // непусто — «дочерняя» версия без своих файлов
+        bool legacyAssets = false;       // индекс с virtual: true (как у 1.6 и старше)
+        int javaMajor = 17;
+        QString releaseTime = QStringLiteral("2023-06-12T13:25:51+00:00");
+        bool listed = true;              // попадает ли в манифест
+    };
+
+    explicit FakeMojang(FakeInternet &net);
+
+    // Публикует версию: json + все файлы, на которые он ссылается.
+    void publish(const VersionSpec &spec);
+    // Переопубликовать манифест (после publish всех версий вызывается автоматически).
+    void routeManifest();
+
+    // Подменить ответ на конкретный файл (по относительному пути внутри .minecraft,
+    // например "libraries/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar").
+    void overrideFile(const QString &relativePath, const FakeResponse &response);
+
+    // Что должно лечь на диск после установки: относительный путь → содержимое.
+    QHash<QString, QByteArray> expectedFiles(const QString &id) const;
+    // URL json версии и URL конкретного файла.
+    QString versionJsonUrl(const QString &id) const;
+    QString fileUrl(const QString &relativePath) const;
+    QByteArray versionJson(const QString &id) const;
+
+    static QString manifestUrl();
+
+private:
+    struct File
+    {
+        QString url;
+        QByteArray data;
+    };
+
+    QString addObject(const QString &relativePath, const QByteArray &data);
+
+    FakeInternet &m_net;
+    QList<VersionSpec> m_specs;
+    QHash<QString, QByteArray> m_versionJson;               // id → json
+    QHash<QString, QHash<QString, QByteArray>> m_expected;  // id → (путь → данные)
+    QHash<QString, File> m_files;                           // относительный путь → файл
+};
@@ -0,0 +1,204 @@
+#include "fixtures.h"
+
+#include "minecraftversion.h"
+
+#include <QBuffer>
+#include <QCryptographicHash>
+#include <QDir>
+#include <QDirIterator>
+#include <QFile>
+#include <QFileInfo>
+#include <QProcess>
+#include <QTemporaryDir>
+#include <QtCore/private/qzipreader_p.h>
+#include <QtCore/private/qzipwriter_p.h>
+
+QString Fixtures::path(const QString &relative)
+{
+    return QStringLiteral(BILAUNCHER_FIXTURES_DIR) + u'/' + relative;
+}
+
+QByteArray Fixtures::read(const QString &relative)
+{
+    QFile file(path(relative));
+    if (!file.open(QIODevice::ReadOnly))
+        qFatal("Нет фикстуры %s", qPrintable(file.fileName()));
+    return file.readAll();
+}
+
+QJsonObject Fixtures::readJson(const QString &relative)
+{
+    return QJsonDocument::fromJson(read(relative)).object();
+}
+
+QString Fixtures::otherOsName()
+{
+    return VersionLoader::osName() == QLatin1String("windows") ? QStringLiteral("linux")
+                                                               : QStringLiteral("windows");
+}
+
+QByteArray Fixtures::applyTemplate(QByteArray text)
+{
+    text.replace("%OS%", VersionLoader::osName().toUtf8());
+    text.replace("%OTHER%", otherOsName().toUtf8());
+    text.replace("%ARCH%", VersionLoader::osArch().toUtf8());
+    text.replace("%NATIVE%", VersionLoader::nativeClassifier().toUtf8());
+    return text;
+}
+
+QByteArray Fixtures::readTemplate(const QString &relative)
+{
+    return applyTemplate(read(relative));
+}
+
+bool Fixtures::write(const QString &filePath, const QByteArray &data)
+{
+    QDir().mkpath(QFileInfo(filePath).absolutePath());
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
+        return false;
+    return file.write(data) == data.size();
+}
+
+bool Fixtures::writeJson(const QString &filePath, const QJsonObject &object)
+{
+    return write(filePath, QJsonDocument(object).toJson(QJsonDocument::Indented));
+}
+
+QByteArray Fixtures::readFile(const QString &filePath)
+{
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly))
+        return {};
+    return file.readAll();
+}
+
+QJsonObject Fixtures::readJsonFile(const QString &filePath)
+{
+    return QJsonDocument::fromJson(readFile(filePath)).object();
+}
+
+QByteArray Fixtures::zipBytes(const QMap<QString, QByteArray> &entries)
+{
+    QBuffer buffer;
+    buffer.open(QIODevice::WriteOnly);
+    {
+        QZipWriter writer(&buffer);
+        writer.setCompressionPolicy(QZipWriter::AutoCompress);
+        for (auto it = entries.cbegin(); it != entries.cend(); ++it) {
+            if (it.key().endsWith(u'/'))
+                writer.addDirectory(it.key());
+            else
+                writer.addFile(it.key(), it.value());
+        }
+        writer.close();
+    }
+    return buffer.data();
+}
+
+bool Fixtures::makeZip(const QString &zipPath, const QMap<QString, QByteArray> &entries)
+{
+    return write(zipPath, zipBytes(entries));
+}
+
+QStringList Fixtures::zipEntries(const QString &zipPath)
+{
+    QZipReader reader(zipPath);
+    QStringList result;
+    for (const QZipReader::FileInfo &info : reader.fileInfoList()) {
+        if (info.isFile)
+            result << info.filePath;
+    }
+    result.sort();
+    return result;
+}
+
+bool Fixtures::makeTarGz(const QString &archivePath, const QMap<QString, QByteArray> &entries)
+{
+    QTemporaryDir staging;
+    if (!staging.isValid())
+        return false;
+    QStringList tops;
+    for (auto it = entries.cbegin(); it != entries.cend(); ++it) {
+        if (!write(staging.path() + u'/' + it.key(), it.value()))
+            return false;
+        const QString top = it.key().section(u'/', 0, 0);
+        if (!tops.contains(top))
+            tops << top;
+    }
+    QDir().mkpath(QFileInfo(archivePath).absolutePath());
+
+    QProcess tar;
+    tar.setWorkingDirectory(staging.path());
+#if defined(Q_OS_WIN)
+    // Системный bsdtar по полному пути: GNU tar из Git, который бывает раньше в PATH,
+    // принимает «C:» за имя удалённого хоста (та же история в release.yml).
+    const QString program = qEnvironmentVariable("SystemRoot") + QStringLiteral("\\System32\\tar.exe");
+#else
+    const QString program = QStringLiteral("tar");
+#endif
+    tar.start(program,
+              QStringList{QStringLiteral("-czf"), QDir::toNativeSeparators(archivePath)} + tops);
+    return tar.waitForFinished(30000) && tar.exitStatus() == QProcess::NormalExit
+           && tar.exitCode() == 0;
+}
+
+QString Fixtures::sha1(const QByteArray &data)
+{
+    return QString::fromLatin1(QCryptographicHash::hash(data, QCryptographicHash::Sha1).toHex());
+}
+
+QString Fixtures::sha256(const QByteArray &data)
+{
+    return QString::fromLatin1(QCryptographicHash::hash(data, QCryptographicHash::Sha256).toHex());
+}
+
+QStringList Fixtures::listTree(const QString &dir)
+{
+    QStringList result;
+    QDirIterator it(dir, QDir::Files | QDir::Hidden | QDir::NoDotAndDotDot,
+                    QDirIterator::Subdirectories);
+    const QDir base(dir);
+    while (it.hasNext())
+        result << base.relativeFilePath(it.next());
+    result.sort();
+    return result;
+}
+
+QString Fixtures::javaExecutableName()
+{
+#if defined(Q_OS_WIN)
+    return QStringLiteral("java.exe");
+#else
+    return QStringLiteral("java");
+#endif
+}
+
+void Fixtures::configureFakeJava(const QString &javaPath, const QString &version,
+                                 const QStringList &config)
+{
+    QStringList lines{QStringLiteral("version=") + version};
+    lines += config;
+    write(QFileInfo(javaPath).absolutePath() + QStringLiteral("/fake-java.cfg"),
+          lines.join(u'\n').toUtf8() + '\n');
+}
+
+QString Fixtures::installFakeJava(const QString &dir, const QString &version,
+                                  const QStringList &config)
+{
+    const QString binDir = dir + QStringLiteral("/bin");
+    QDir().mkpath(binDir);
+    const QString java = binDir + u'/' + javaExecutableName();
+    QFile::remove(java);
+    if (!QFile::copy(QStringLiteral(BILAUNCHER_FAKE_JAVA), java))
+        qFatal("Не удалось скопировать fake_java в %s", qPrintable(java));
+    QFile::setPermissions(java, QFile::permissions(java) | QFileDevice::ExeOwner
+                                    | QFileDevice::ExeGroup | QFileDevice::ExeOther);
+#if defined(Q_OS_WIN)
+    const QString javaw = binDir + QStringLiteral("/javaw.exe");
+    QFile::remove(javaw);
+    QFile::copy(java, javaw);
+#endif
+    configureFakeJava(java, version, config);
+    return java;
+}
@@ -0,0 +1,60 @@
+#pragma once
+
+// Фикстуры и мелкие помощники для подготовки файлов в песочнице.
+
+#include <QByteArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QMap>
+#include <QString>
+#include <QStringList>
+
+namespace Fixtures {
+
+// Абсолютный путь к tests/fixtures/<relative>.
+QString path(const QString &relative);
+
+// Содержимое фикстуры; при отсутствии файла тест падает через qFatal.
+QByteArray read(const QString &relative);
+QJsonObject readJson(const QString &relative);
+
+// Фикстура-шаблон: %OS%, %OTHER%, %ARCH%, %NATIVE% заменяются на значения
+// текущей платформы (имя ОС в терминах Mojang, «чужая» ОС, архитектура,
+// классификатор нативов LWJGL) — один json годится для всех трёх ОС.
+QByteArray readTemplate(const QString &relative);
+QByteArray applyTemplate(QByteArray text);
+QString otherOsName();
+
+// Пишет файл, создавая недостающие папки.
+bool write(const QString &path, const QByteArray &data);
+bool writeJson(const QString &path, const QJsonObject &object);
+QByteArray readFile(const QString &path);
+QJsonObject readJsonFile(const QString &path);
+
+// Zip из пар «путь внутри архива → содержимое» (через QZipWriter, как в коде лаунчера).
+bool makeZip(const QString &zipPath, const QMap<QString, QByteArray> &entries);
+QByteArray zipBytes(const QMap<QString, QByteArray> &entries);
+// Список файлов в zip — как его видит QZipReader (ведущие «.» и «/» он срезает).
+QStringList zipEntries(const QString &zipPath);
+
+// tar.gz через системный tar (есть и на Windows 10+, и на Unix).
+bool makeTarGz(const QString &archivePath, const QMap<QString, QByteArray> &entries);
+
+QString sha1(const QByteArray &data);
+QString sha256(const QByteArray &data);
+
+// Все файлы под папкой (относительные пути, «/» в качестве разделителя), отсортированы.
+QStringList listTree(const QString &dir);
+
+// Подставная java (см. tests/fake_java). Копирует бинарник в <dir>/bin/java[.exe]
+// (на Windows ещё и javaw.exe) и пишет рядом fake-java.cfg из строк config.
+// Возвращает путь к java.
+QString installFakeJava(const QString &dir, const QString &version,
+                        const QStringList &config = {});
+// Переписать fake-java.cfg у уже установленной подставной java.
+void configureFakeJava(const QString &javaPath, const QString &version,
+                       const QStringList &config);
+
+QString javaExecutableName();
+
+} // namespace Fixtures
@@ -0,0 +1,39 @@
+#pragma once
+
+// Помощники для тестов сетевых сервисов.
+
+#include "fakeinternet.h"
+
+#include <QString>
+#include <QtTest/QTest>
+
+// В initTestCase(): поднять FakeInternet или пропустить весь тест-класс.
+// С BILAUNCHER_REQUIRE_FAKE_INTERNET=1 (так в CI на Linux) недоступность —
+// ошибка, а не пропуск: иначе сломанный перехват тихо выключил бы все сетевые тесты.
+#define BILAUNCHER_START_FAKE_INTERNET(net)                                                        \
+    do {                                                                                           \
+        QString startError_;                                                                       \
+        if (!(net).start(&startError_)) {                                                          \
+            const QString message_ = QStringLiteral("FakeInternet недоступен: ") + startError_;    \
+            if (qEnvironmentVariableIntValue("BILAUNCHER_REQUIRE_FAKE_INTERNET"))                   \
+                QFAIL(qPrintable(message_));                                                       \
+            QSKIP(qPrintable(message_));                                                           \
+        }                                                                                          \
+    } while (false)
+
+// Результат колбэка вида (bool ok, QString warning).
+struct CallResult
+{
+    int calls = 0;
+    bool ok = false;
+    QString warning;
+
+    auto callback()
+    {
+        return [this](bool okValue, const QString &warningValue) {
+            ++calls;
+            ok = okValue;
+            warning = warningValue;
+        };
+    }
+};
@@ -0,0 +1,115 @@
+#include "testenv.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QFile>
+#include <QTemporaryDir>
+
+#include <cstdio>
+#include <cstdlib>
+
+#if defined(Q_OS_WIN)
+#include <qt_windows.h>
+#include <stdlib.h>   // _wputenv_s
+#endif
+
+namespace {
+
+QTemporaryDir *g_sandbox = nullptr;
+
+[[noreturn]] void abortSetup(const QString &message)
+{
+    const QString line = QStringLiteral("TestEnv: ") + message + u'\n';
+#if defined(Q_OS_WIN)
+    // В живую консоль пишем UTF-16 напрямую: кодовая страница консоли тогда не важна.
+    const HANDLE handle = GetStdHandle(STD_ERROR_HANDLE);
+    DWORD mode = 0;
+    if (handle != INVALID_HANDLE_VALUE && GetConsoleMode(handle, &mode)) {
+        DWORD written = 0;
+        WriteConsoleW(handle, reinterpret_cast<const wchar_t *>(line.utf16()),
+                      DWORD(line.size()), &written, nullptr);
+        std::exit(2);
+    }
+#endif
+    // Вывод в трубу (ctest, CI) — UTF-8, как его и читает ctest. Локальная 8-битная
+    // кодировка Windows (cp1252/cp1251) превращала кириллицу в «???».
+    std::fputs(line.toUtf8().constData(), stderr);
+    std::fflush(stderr);
+    std::exit(2);
+}
+
+} // namespace
+
+void TestEnv::prepareSandbox()
+{
+    g_sandbox = new QTemporaryDir(QDir::tempPath() + QStringLiteral("/bilauncher-test-XXXXXX"));
+    if (!g_sandbox->isValid())
+        abortSetup(QStringLiteral("не удалось создать временную папку"));
+
+    const QString home = QDir::toNativeSeparators(g_sandbox->path());
+    setEnvPath("HOME", home);
+    setEnvPath("USERPROFILE", home);
+    // LauncherPaths: на Windows QDir::homePath() HOME/USERPROFILE не читает, а эту
+    // переменную лаунчер читает везде. Дочерние процессы получают её по наследству.
+    setEnvPath("BILAUNCHER_HOME", home);
+    // Чужая Java из окружения машины не должна влиять на выбор Java в тестах.
+    qunsetenv("JAVA_HOME");
+
+    std::atexit([] {
+        delete g_sandbox;
+        g_sandbox = nullptr;
+    });
+}
+
+void TestEnv::finishSetup()
+{
+    QCoreApplication::setApplicationName(QStringLiteral("BiLauncher"));
+    QCoreApplication::setOrganizationName(QStringLiteral("GaleonDev"));
+
+    const QString root = QDir::cleanPath(LauncherPaths::rootDir());
+    const QString sandbox = QDir::cleanPath(g_sandbox->path());
+    const QString game = QDir::cleanPath(LauncherPaths::defaultMinecraftDir());
+    // Ни одна папка лаунчера не должна указывать на настоящий профиль: resetLauncherRoot()
+    // стирает rootDir() целиком.
+    for (const QString &path : {root, game}) {
+        if (!path.startsWith(sandbox + u'/'))
+            abortSetup(QStringLiteral("путь лаунчера %1 вне песочницы %2 — отказываюсь запускаться")
+                           .arg(QDir::toNativeSeparators(path), QDir::toNativeSeparators(sandbox)));
+    }
+
+    if (!Localization::instance().load())
+        abortSetup(QStringLiteral("не загрузился каталог переводов"));
+    Localization::instance().setLanguage(QStringLiteral("en"));
+}
+
+void TestEnv::setEnvPath(const char *name, const QString &path)
+{
+    // На Windows qputenv() пишет в ANSI-кодировке и испортил бы, например,
+    // кириллическое имя пользователя во временном пути.
+#if defined(Q_OS_WIN)
+    _wputenv_s(reinterpret_cast<const wchar_t *>(QString::fromLatin1(name).utf16()),
+               reinterpret_cast<const wchar_t *>(path.utf16()));
+#else
+    qputenv(name, QFile::encodeName(path));
+#endif
+}
+
+QString TestEnv::homeDir()
+{
+    return g_sandbox->path();
+}
+
+QString TestEnv::freshDir(const QString &name)
+{
+    const QString path = g_sandbox->path() + QStringLiteral("/work/") + name;
+    QDir(path).removeRecursively();
+    QDir().mkpath(path);
+    return path;
+}
+
+void TestEnv::resetLauncherRoot()
+{
+    QDir(LauncherPaths::rootDir()).removeRecursively();
+}
@@ -0,0 +1,55 @@
+#pragma once
+
+// Общая обвязка тестов: песочница для домашней папки и main для QtTest.
+//
+// LauncherPaths строит все пути от домашней папки. Каждый тестовый процесс до
+// создания QCoreApplication заводит свою временную папку и направляет туда
+// BILAUNCHER_HOME (её LauncherPaths читает на всех ОС), а заодно HOME и
+// USERPROFILE (их читает QDir::homePath() на Linux и macOS). На Windows
+// QDir::homePath() переменные окружения игнорирует, поэтому без BILAUNCHER_HOME
+// там не обойтись. Реальные папка лаунчера и .minecraft машины, на которой гоняются
+// тесты, не трогаются: если путь лаунчера всё же оказался вне песочницы,
+// процесс сразу завершается с кодом 2.
+
+#include <QCoreApplication>
+#include <QString>
+#include <QtTest/QTest>
+
+namespace TestEnv {
+
+// До QCoreApplication: временная папка и подмена BILAUNCHER_HOME/HOME/USERPROFILE.
+void prepareSandbox();
+
+// После QCoreApplication: проверка, что пути лаунчера ушли в песочницу,
+// загрузка переводов, английский язык (тексты ошибок не зависят от локали машины).
+void finishSetup();
+
+// Переменная окружения с путём, без потерь символов вне ANSI-кодировки на Windows.
+void setEnvPath(const char *name, const QString &path);
+
+// Корень песочницы — домашняя папка, от которой LauncherPaths строит пути в тестах.
+QString homeDir();
+
+// Свежая пустая папка внутри песочницы (для .minecraft, архивов и т. п.).
+QString freshDir(const QString &name);
+
+// Стирает папку лаунчера (LauncherPaths::rootDir()) — между тестами.
+void resetLauncherRoot();
+
+} // namespace TestEnv
+
+#define BILAUNCHER_TEST_MAIN_IMPL(AppType, TestObject)        \
+    int main(int argc, char *argv[])                          \
+    {                                                         \
+        TestEnv::prepareSandbox();                            \
+        AppType app(argc, argv);                              \
+        TestEnv::finishSetup();                               \
+        TestObject tc;                                        \
+        QTEST_SET_MAIN_SOURCE_PATH                            \
+        return QTest::qExec(&tc, argc, argv);                 \
+    }
+
+#define BILAUNCHER_TEST_MAIN(TestObject) BILAUNCHER_TEST_MAIN_IMPL(QCoreApplication, TestObject)
+
+// Тесту с GUI нужно самому подключить <QGuiApplication>.
+#define BILAUNCHER_GUI_TEST_MAIN(TestObject) BILAUNCHER_TEST_MAIN_IMPL(QGuiApplication, TestObject)
@@ -0,0 +1,137 @@
+// Подставная «java» для тестов. Без Qt, чтобы её копию можно было положить
+// в любую папку и запустить без поиска библиотек Qt.
+//
+// Поведение задаётся файлом fake-java.cfg рядом с исполняемым файлом,
+// по строке «ключ=значение»:
+//   version=21.0.2           что печатать на «-version» (в stderr, как настоящая java)
+//   exit=0                   код выхода обычного запуска
+//   sleep_ms=0               сколько «работать» перед выходом
+//   args_file=<путь>         куда записать аргументы, по одному на строку
+//   dump_env=<ИМЯ>           дописать в args_file строку «env:ИМЯ=значение» (можно несколько)
+//   stdout=<строка>          что напечатать в stdout (можно несколько)
+//   create=<путь>\t<текст>   создать файл с текстом; относительный путь — от рабочей папки
+//   crash=1                  завершиться аварийно (abort)
+
+#include <chrono>
+#include <cstdlib>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <string>
+#include <thread>
+#include <vector>
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif defined(__APPLE__)
+#include <mach-o/dyld.h>
+#endif
+
+namespace fs = std::filesystem;
+
+namespace {
+
+fs::path executablePath(const char *argv0)
+{
+#if defined(_WIN32)
+    wchar_t buffer[MAX_PATH * 4];
+    const DWORD size = GetModuleFileNameW(nullptr, buffer, DWORD(std::size(buffer)));
+    return fs::path(std::wstring(buffer, size));
+#elif defined(__APPLE__)
+    char buffer[4096];
+    uint32_t size = sizeof(buffer);
+    if (_NSGetExecutablePath(buffer, &size) == 0)
+        return fs::canonical(buffer);
+    return fs::absolute(argv0);
+#else
+    std::error_code ec;
+    const fs::path self = fs::read_symlink("/proc/self/exe", ec);
+    return ec ? fs::absolute(argv0) : self;
+#endif
+}
+
+} // namespace
+
+int main(int argc, char *argv[])
+{
+    std::string version = "17.0.8";
+    int exitCode = 0;
+    int sleepMs = 0;
+    bool crash = false;
+    std::string argsFile;
+    std::vector<std::string> dumpEnv;
+    std::vector<std::string> stdoutLines;
+    std::vector<std::pair<std::string, std::string>> creates;
+
+    std::ifstream config(executablePath(argv[0]).parent_path() / "fake-java.cfg");
+    for (std::string line; std::getline(config, line);) {
+        if (!line.empty() && line.back() == '\r')
+            line.pop_back();
+        const auto eq = line.find('=');
+        if (eq == std::string::npos)
+            continue;
+        const std::string key = line.substr(0, eq);
+        const std::string value = line.substr(eq + 1);
+        if (key == "version")
+            version = value;
+        else if (key == "exit")
+            exitCode = std::atoi(value.c_str());
+        else if (key == "sleep_ms")
+            sleepMs = std::atoi(value.c_str());
+        else if (key == "crash")
+            crash = value == "1";
+        else if (key == "args_file")
+            argsFile = value;
+        else if (key == "dump_env")
+            dumpEnv.push_back(value);
+        else if (key == "stdout")
+            stdoutLines.push_back(value);
+        else if (key == "create") {
+            const auto tab = value.find('\t');
+            creates.emplace_back(value.substr(0, tab),
+                                 tab == std::string::npos ? std::string() : value.substr(tab + 1));
+        }
+    }
+
+    for (int i = 1; i < argc; ++i) {
+        if (std::string(argv[i]) == "-version") {
+            std::cerr << "openjdk version \"" << version << "\" 2024-01-16\n"
+                      << "OpenJDK Runtime Environment (fake)\n";
+            return 0;
+        }
+    }
+
+    if (!argsFile.empty()) {
+        std::ofstream out(argsFile, std::ios::trunc);
+        for (int i = 1; i < argc; ++i)
+            out << argv[i] << '\n';
+        for (const std::string &name : dumpEnv) {
+            const char *value = std::getenv(name.c_str());
+            out << "env:" << name << '=' << (value ? value : "") << '\n';
+        }
+    }
+
+    for (const auto &[path, text] : creates) {
+        const fs::path target(path);
+        std::error_code ec;
+        if (target.has_parent_path())
+            fs::create_directories(target.parent_path(), ec);
+        std::ofstream(target, std::ios::trunc | std::ios::binary) << text;
+    }
+
+    for (const std::string &line : stdoutLines)
+        std::cout << line << '\n';
+    std::cout.flush();
+
+    if (sleepMs > 0)
+        std::this_thread::sleep_for(std::chrono::milliseconds(sleepMs));
+    if (crash) {
+#if defined(_WIN32)
+        // QProcess считает аварией коды 0x8xxxxxxx–0xCxxxxxxx; abort() дал бы код 3.
+        TerminateProcess(GetCurrentProcess(), 0xC0000005);
+#endif
+        std::abort();
+    }
+    return exitCode;
+}
@@ -0,0 +1,9 @@
+[
+  {"loader": {"separator": ".", "build": 9, "maven": "net.fabricmc:fabric-loader:0.16.9", "version": "0.16.9", "stable": true},
+   "intermediary": {"maven": "net.fabricmc:intermediary:1.20.1", "version": "1.20.1", "stable": true}},
+  {"loader": {"separator": ".", "build": 10, "maven": "net.fabricmc:fabric-loader:0.16.10", "version": "0.16.10", "stable": true},
+   "intermediary": {"maven": "net.fabricmc:intermediary:1.20.1", "version": "1.20.1", "stable": true}},
+  {"loader": {"separator": "+", "build": 1, "maven": "net.fabricmc:fabric-loader:0.17.0-beta.1", "version": "0.17.0-beta.1", "stable": false},
+   "intermediary": {"maven": "net.fabricmc:intermediary:1.20.1", "version": "1.20.1", "stable": true}},
+  {"loader": {"version": ""}}
+]
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<metadata>
+  <groupId>net.minecraftforge</groupId>
+  <artifactId>forge</artifactId>
+  <versioning>
+    <latest>1.21.1-52.0.10</latest>
+    <release>1.21.1-52.0.10</release>
+    <versions>
+      <version>1.7.10-10.13.4.1614-1.7.10</version>
+      <version>1.20.1-47.3.0</version>
+      <version>1.20.1-47.4.0</version>
+      <version>1.20.1-47.4.1</version>
+      <version>1.21.1-52.0.10</version>
+      <version>1.21.1-52.0.2-beta</version>
+      <version>broken-</version>
+    </versions>
+  </versioning>
+</metadata>
@@ -0,0 +1,2 @@
+{"homepage": "https://files.minecraftforge.net/net/minecraftforge/forge/",
+ "promos": {"1.20.1-latest": "47.4.1", "1.20.1-recommended": "47.4.0", "1.21.1-latest": "52.0.10"}}
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<metadata>
+  <groupId>net.neoforged</groupId>
+  <artifactId>forge</artifactId>
+  <versioning>
+    <versions>
+      <version>1.20.1-47.1.106</version>
+      <version>1.20.1-47.1.79</version>
+    </versions>
+  </versioning>
+</metadata>
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<metadata>
+  <groupId>net.neoforged</groupId>
+  <artifactId>neoforge</artifactId>
+  <versioning>
+    <versions>
+      <version>20.4.80-beta</version>
+      <version>20.4.237</version>
+      <version>21.0.10</version>
+      <version>21.1.200</version>
+      <version>21.1.248</version>
+      <version>26.1.0.5</version>
+      <version>26.1.1.3</version>
+    </versions>
+  </versioning>
+</metadata>
@@ -0,0 +1,4 @@
+[
+  {"loader": {"separator": ".", "build": 21, "maven": "org.quiltmc:quilt-loader:0.26.4-beta.1", "version": "0.26.4-beta.1"}},
+  {"loader": {"separator": ".", "build": 20, "maven": "org.quiltmc:quilt-loader:0.26.3", "version": "0.26.3"}}
+]
@@ -0,0 +1,16 @@
+{
+  "latest": {"release": "1.21.8", "snapshot": "25w33a"},
+  "versions": [
+    {"id": "1.20.1", "type": "release", "url": "https://piston-meta.mojang.com/v1/packages/aaaa/1.20.1.json",
+     "time": "2023-06-12T13:25:51+00:00", "releaseTime": "2023-06-12T13:25:51+00:00", "sha1": "aaaa", "complianceLevel": 1},
+    {"id": "25w33a", "type": "snapshot", "url": "https://piston-meta.mojang.com/v1/packages/cccc/25w33a.json",
+     "time": "2025-08-13T12:00:00+00:00", "releaseTime": "2025-08-13T12:00:00+00:00", "sha1": "cccc", "complianceLevel": 1},
+    {"id": "1.21.8", "type": "release", "url": "https://piston-meta.mojang.com/v1/packages/bbbb/1.21.8.json",
+     "time": "2025-07-17T12:00:00+00:00", "releaseTime": "2025-07-17T12:00:00+00:00", "sha1": "bbbb", "complianceLevel": 1},
+    {"id": "b1.7.3", "type": "old_beta", "url": "https://piston-meta.mojang.com/v1/packages/dddd/b1.7.3.json",
+     "time": "2011-07-08T00:00:00+00:00", "releaseTime": "2011-07-08T00:00:00+00:00", "sha1": "dddd", "complianceLevel": 0},
+    {"id": "insecure", "type": "release", "url": "http://piston-meta.mojang.com/insecure.json",
+     "releaseTime": "2024-01-01T00:00:00+00:00", "sha1": "eeee"},
+    {"type": "release", "url": "https://piston-meta.mojang.com/noid.json", "releaseTime": "2024-01-01T00:00:00+00:00"}
+  ]
+}
@@ -0,0 +1,240 @@
+{
+ "formatVersion": 1,
+ "builds": [
+  {
+   "id": "season-4",
+   "name": "Сезон 4",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-03-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/s4.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   },
+   "seasonEnd": "2025-06-01"
+  },
+  {
+   "id": "season-5",
+   "name": "Сезон 5: Пустоши",
+   "revision": 3,
+   "minecraftVersion": "1.21.1",
+   "loader": "fabric",
+   "loaderVersion": "0.16.10",
+   "modCount": 120,
+   "seasonStart": "2025-07-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 21,
+   "description": "  Пустоши  ",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/s5.zip",
+    "size": 123456,
+    "sha256": "ABCDEF0000000000000000000000000000000000000000000000000000000000"
+   }
+  },
+  {
+   "id": "vanilla-plus",
+   "name": "Vanilla+",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "",
+   "loaderVersion": "",
+   "modCount": 10,
+   "seasonStart": "2025-05-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/v.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "Bad-ID",
+   "name": "caps",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "no-name",
+   "name": "   ",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "zero-rev",
+   "name": "X",
+   "revision": 0,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "bad-mc",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "../1.20",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "bad-loader",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "liteloader",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "no-loader-version",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "bad-sha",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "xyz"
+   }
+  },
+  {
+   "id": "neg-size",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": -1,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "foreign-host",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "https://evil.example/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  },
+  {
+   "id": "http-scheme",
+   "name": "X",
+   "revision": 1,
+   "minecraftVersion": "1.20.1",
+   "loader": "forge",
+   "loaderVersion": "47.4.0",
+   "modCount": 10,
+   "seasonStart": "2025-01-01",
+   "serverUrl": "play.example.com",
+   "javaMajor": 17,
+   "description": "d",
+   "archive": {
+    "url": "http://launcher-builds.galeonworx.com/packs/x.zip",
+    "size": 100,
+    "sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+   }
+  }
+ ]
+}
@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC6zCCAdOgAwIBAgIJALwPNtuB/leeMA0GCSqGSIb3DQEBCwUAMB0xGzAZBgNV
+BAMMEmZha2UtaW50ZXJuZXQudGVzdDAgFw0yNjEwMTEyMDQ4NTZaGA8yMTI2MDkx
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+9YFYH9P/I0jsHDT/VK+6PF2JTdErqWfCxryDuUgheLw1/W8T+5CVVCvb4Hr0fsP3
+0o/cCfPR9wdsqGalv6dl3cuAWCRqEq1lNVLQVbY1cg==
+-----END CERTIFICATE-----
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQC8UBteu5TVZT26
+0tr9JIEhfxdRCzyuO6YqgrXdFU8qWRIaWfm6bPQxklqz3lDAcN/yzSopHbA7IVmA
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+Mv+y9lT/Hf6ZSiiti8EQGQ==
+-----END PRIVATE KEY-----
@@ -0,0 +1,9 @@
+{
+  "id": "fabric-loader-0.15.0-1.20.1", "inheritsFrom": "1.20.1", "type": "release",
+  "mainClass": "net.fabricmc.loader.impl.launch.knot.KnotClient",
+  "arguments": {"game": [], "jvm": ["-DFabricMcEmu= net.minecraft.client.main.Main "]},
+  "libraries": [
+    {"name": "net.fabricmc:fabric-loader:0.15.0", "url": "https://maven.fabricmc.net/"},
+    {"name": "com.mojang:brigadier:9.9.9", "url": "https://maven.fabricmc.net/"}
+  ]
+}
@@ -0,0 +1,16 @@
+{
+  "id": "1.7.10", "mainClass": "net.minecraft.client.main.Main",
+  "minecraftArguments": "--username ${auth_player_name}  --session ${auth_session} --gameDir ${game_directory}",
+  "assets": "1.7.10",
+  "libraries": [
+    {"name": "org.lwjgl.lwjgl:lwjgl-platform:2.9.1",
+     "natives": {"linux": "natives-linux", "windows": "natives-windows-${arch}", "osx": "natives-osx"},
+     "extract": {"exclude": ["META-INF/"]},
+     "downloads": {"classifiers": {
+        "natives-linux": {"path": "lw/natives-linux.jar", "url": "https://l/nl.jar", "sha1": "1", "size": 1},
+        "natives-windows-64": {"path": "lw/natives-windows-64.jar", "url": "https://l/nw.jar", "sha1": "2", "size": 2},
+        "natives-windows-32": {"path": "lw/natives-windows-32.jar", "url": "https://l/nw32.jar", "sha1": "3", "size": 3},
+        "natives-osx": {"path": "lw/natives-osx.jar", "url": "https://l/no.jar", "sha1": "4", "size": 4}}}},
+    {"name": "net.minecraft:launchwrapper:1.12", "url": "https://libraries.example/maven"}
+  ]
+}
@@ -0,0 +1,42 @@
+{
+  "id": "1.20.1",
+  "type": "release",
+  "mainClass": "net.minecraft.client.main.Main",
+  "assets": "5",
+  "assetIndex": {"id": "5", "url": "https://piston-meta.mojang.com/5.json", "sha1": "aa", "size": 1},
+  "javaVersion": {"component": "java-runtime-gamma", "majorVersion": 17},
+  "logging": {"client": {"argument": "-Dlog4j.configurationFile=${path}",
+                         "file": {"id": "client-1.12.xml", "url": "https://x/client-1.12.xml"}}},
+  "arguments": {
+    "game": ["--username", "${auth_player_name}", "--version", "${version_name}",
+             "--gameDir", "${game_directory}", "--assetsDir", "${assets_root}",
+             "--assetIndex", "${assets_index_name}", "--uuid", "${auth_uuid}",
+             "--accessToken", "${auth_access_token}", "--userType", "${user_type}",
+             "--versionType", "${version_type}",
+             {"rules": [{"action": "allow", "features": {"is_demo_user": true}}], "value": "--demo"},
+             {"rules": [{"action": "allow", "features": {"has_custom_resolution": true}}],
+              "value": ["--width", "${resolution_width}", "--height", "${resolution_height}"]},
+             {"rules": [{"action": "allow", "features": {"is_quick_play_multiplayer": true}}],
+              "value": ["--quickPlayMultiplayer", "${quickPlayMultiplayer}"]}],
+    "jvm": [{"rules": [{"action": "allow", "os": {"name": "%OS%"}}], "value": "-Dthis.os=yes"},
+            {"rules": [{"action": "allow", "os": {"name": "%OTHER%"}}], "value": "-Dother.os=yes"},
+            "-Djava.library.path=${natives_directory}", "-cp", "${classpath}"]
+  },
+  "libraries": [
+    {"name": "com.mojang:brigadier:1.1.8",
+     "downloads": {"artifact": {"path": "com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar",
+                                "url": "https://libraries.minecraft.net/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar",
+                                "sha1": "5244ce82c3337bba4a196a3ce858bfaecc74404a", "size": 77392}}},
+    {"name": "org.lwjgl:lwjgl:3.3.1",
+     "downloads": {"artifact": {"path": "org/lwjgl/lwjgl/3.3.1/lwjgl-3.3.1.jar", "url": "https://l/lwjgl.jar", "sha1": "s1", "size": 1}}},
+    {"name": "org.lwjgl:lwjgl:3.3.1:%NATIVE%",
+     "downloads": {"artifact": {"path": "org/lwjgl/lwjgl/3.3.1/lwjgl-3.3.1-%NATIVE%.jar", "url": "https://l/native.jar", "sha1": "s2", "size": 2}},
+     "rules": [{"action": "allow", "os": {"name": "%OS%"}}]},
+    {"name": "org.lwjgl:lwjgl:3.3.1:natives-other",
+     "downloads": {"artifact": {"path": "org/lwjgl/lwjgl/3.3.1/lwjgl-3.3.1-natives-other.jar", "url": "https://l/o.jar", "sha1": "s3", "size": 3}},
+     "rules": [{"action": "allow", "os": {"name": "%OTHER%"}}]},
+    {"name": "only.other:lib:1.0",
+     "downloads": {"artifact": {"path": "only/other/lib/1.0/lib-1.0.jar", "url": "https://l/x.jar", "sha1": "s4", "size": 4}},
+     "rules": [{"action": "allow"}, {"action": "disallow", "os": {"name": "%OS%"}}]}
+  ]
+}
@@ -0,0 +1,15 @@
+# Сетевые сервисы против FakeInternet (локальный прокси + TLS, без настоящей сети).
+foreach(test IN ITEMS
+        tst_fakeinternet
+        tst_versionmanifestservice
+        tst_seasonalbuildservice
+        tst_modloaderversionservice
+        tst_javaruntimeservice
+        tst_authservice
+        tst_msaauthservice
+        tst_versioninstaller
+        tst_seasonalpackdownloader
+        tst_javainstaller
+        tst_modloaderinstaller)
+    bilauncher_add_test(${test} LABEL net SOURCES ${test}.cpp)
+endforeach()
@@ -0,0 +1,298 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "authservice.h"
+#include "localization.h"
+
+#include <QJsonDocument>
+#include <QSignalSpy>
+
+namespace {
+
+const QString kAuth = QStringLiteral("https://authserver.ely.by/auth/authenticate");
+const QString kValidate = QStringLiteral("https://authserver.ely.by/auth/validate");
+const QString kRefresh = QStringLiteral("https://authserver.ely.by/auth/refresh");
+const QString kInjectorManifest = QStringLiteral("https://authlib-injector.yushi.moe/artifact/latest.json");
+const QString kInjectorJar = QStringLiteral("https://authlib-injector.yushi.moe/artifact/53/authlib-injector-1.2.5.jar");
+
+QJsonObject body(const FakeRequest &request)
+{
+    return QJsonDocument::fromJson(request.body).object();
+}
+
+QJsonObject profileResponse(const QString &token, const QString &clientToken)
+{
+    return QJsonObject{{"accessToken", token},
+                       {"clientToken", clientToken},
+                       {"selectedProfile", QJsonObject{{"id", "ffffffff-ffff-ffff-ffff-ffffffffffff"},
+                                                       {"name", "ElyPlayer"}}}};
+}
+
+// Сервер Ely.by в миниатюре: пароль «secret», у пользователя «2fa» — ещё код 123456.
+FakeResponse elyAuthenticate(const FakeRequest &request)
+{
+    const QJsonObject in = body(request);
+    const QString user = in.value("username").toString();
+    const QString password = in.value("password").toString();
+    if (user == QLatin1String("2fa")) {
+        if (password == QLatin1String("secret:123456"))
+            return FakeResponse::json(profileResponse("token-2fa", in.value("clientToken").toString()));
+        if (password == QLatin1String("secret"))
+            return FakeResponse::json(QJsonObject{{"error", "ForbiddenOperationException"},
+                                                  {"errorMessage", "Account protected with two factor auth."}}, 401);
+    }
+    if (password == QLatin1String("secret"))
+        return FakeResponse::json(profileResponse("token-" + user, in.value("clientToken").toString()));
+    return FakeResponse::json(QJsonObject{{"error", "ForbiddenOperationException"},
+                                          {"errorMessage", "Invalid credentials. Invalid username or password."}}, 401);
+}
+
+struct Captured
+{
+    int calls = 0;
+    AuthResult result;
+    auto callback()
+    {
+        return [this](const AuthResult &r) { ++calls; result = r; };
+    }
+};
+
+} // namespace
+
+class TestAuthService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_dir;
+
+    static bool wait(Captured &c) { return QTest::qWaitFor([&] { return c.calls > 0; }, 15000); }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        m_net.reset();
+        m_net.route(kAuth, elyAuthenticate);
+        m_dir = TestEnv::freshDir(QStringLiteral("injector"));
+    }
+
+    void passwordLogin()
+    {
+        AuthService service;
+        QSignalSpy progress(&service, &AuthService::progress);
+        Captured c;
+        service.loginElyBy("steve", "secret", "client-1", QString(), c.callback());
+        QVERIFY(wait(c));
+        QVERIFY2(c.result.ok, qPrintable(c.result.error));
+        QCOMPARE(c.result.playerName, QStringLiteral("ElyPlayer"));
+        QCOMPARE(c.result.uuid, QStringLiteral("ffffffffffffffffffffffffffffffff"));   // без дефисов
+        QCOMPARE(c.result.accessToken, QStringLiteral("token-steve"));
+        QCOMPARE(c.result.clientToken, QStringLiteral("client-1"));
+        QCOMPARE(c.result.userType, QStringLiteral("ELYBY"));
+        QCOMPARE(progress.count(), 1);
+
+        const QJsonObject sent = body(m_net.requests().constFirst());
+        QCOMPARE(sent.value("username").toString(), QStringLiteral("steve"));
+        QCOMPARE(sent.value("clientToken").toString(), QStringLiteral("client-1"));
+        QCOMPARE(sent.value("requestUser").toBool(), true);
+        QCOMPARE(m_net.requests().constFirst().header("content-type"), QByteArray("application/json"));
+    }
+
+    void emptyClientTokenIsGenerated()
+    {
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", QString(), QString(), c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(c.result.ok);
+        QVERIFY(!c.result.clientToken.isEmpty());
+        QCOMPARE(body(m_net.requests().constFirst()).value("clientToken").toString(), c.result.clientToken);
+    }
+
+    void wrongPasswordAndEmptyPassword()
+    {
+        AuthService service;
+        Captured wrong;
+        service.loginElyBy("steve", "nope", "c", QString(), wrong.callback());
+        QVERIFY(wait(wrong));
+        QVERIFY(!wrong.result.ok);
+        QVERIFY(!wrong.result.twoFactorRequired);
+        QCOMPARE(wrong.result.error, QStringLiteral("Invalid credentials. Invalid username or password."));
+
+        Captured empty;
+        service.loginElyBy("steve", QString(), "c", QString(), empty.callback());
+        QCOMPARE(empty.calls, 1);   // сразу, без сети
+        QCOMPARE(empty.result.error, Loc::text("auth.ely.error.noPassword"));
+        QCOMPARE(m_net.requests().size(), 1);
+    }
+
+    void twoFactorFlow()
+    {
+        AuthService service;
+        Captured first;
+        service.loginElyBy("2fa", "secret", "c", QString(), first.callback());
+        QVERIFY(wait(first));
+        QVERIFY(!first.result.ok);
+        QVERIFY(first.result.twoFactorRequired);
+        QCOMPARE(first.result.error, Loc::text("auth.ely.error.twoFactor"));
+
+        Captured second;
+        service.loginElyByWithTotp("2fa", "secret", "123456", "c", second.callback());
+        QVERIFY(wait(second));
+        QVERIFY2(second.result.ok, qPrintable(second.result.error));
+        QCOMPARE(second.result.accessToken, QStringLiteral("token-2fa"));
+        // Код уходит через двоеточие после пароля — так требует Ely.by.
+        QCOMPARE(body(m_net.requests().constLast()).value("password").toString(), QStringLiteral("secret:123456"));
+    }
+
+    void validTokenSkipsPassword()
+    {
+        m_net.route(kValidate, FakeResponse::json("{}"));
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", "stored-token", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(c.result.ok);
+        QCOMPARE(c.result.accessToken, QStringLiteral("stored-token"));
+        QCOMPARE(m_net.hits(kAuth), 0);
+        QCOMPARE(body(m_net.requests().constFirst()).value("accessToken").toString(), QStringLiteral("stored-token"));
+    }
+
+    void expiredTokenIsRefreshed()
+    {
+        m_net.route(kValidate, FakeResponse::json(QJsonObject{{"error", "ForbiddenOperationException"}}, 401));
+        m_net.route(kRefresh, [](const FakeRequest &request) {
+            const QJsonObject in = body(request);
+            return FakeResponse::json(profileResponse("refreshed-" + in.value("accessToken").toString(),
+                                                      in.value("clientToken").toString()));
+        });
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", "old", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(c.result.ok);
+        QCOMPARE(c.result.accessToken, QStringLiteral("refreshed-old"));
+        QCOMPARE(c.result.playerName, QStringLiteral("ElyPlayer"));
+        QCOMPARE(m_net.hits(kAuth), 0);
+    }
+
+    void failedRefreshFallsBackToPassword()
+    {
+        m_net.route(kValidate, FakeResponse::json("{}", 401));
+        m_net.route(kRefresh, FakeResponse::json("{}", 401));
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", "old", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(c.result.ok);
+        QCOMPARE(c.result.accessToken, QStringLiteral("token-steve"));
+        QCOMPARE(m_net.hits(kAuth), 1);
+    }
+
+    void transportErrorIsReported()
+    {
+        FakeResponse drop;
+        drop.drop = true;
+        m_net.route(kAuth, drop);
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", QString(), c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(!c.result.ok);
+        QVERIFY(c.result.error.startsWith(Loc::text("auth.ely.error.unreachable").section(u'%', 0, 0)));
+    }
+
+    void responseWithoutProfileIsError()
+    {
+        m_net.route(kAuth, FakeResponse::json(QJsonObject{{"accessToken", "t"}}));
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", QString(), c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(!c.result.ok);
+        QCOMPARE(c.result.error, Loc::text("auth.ely.error.noGameProfile"));
+    }
+
+    void serverErrorWithoutMessageShowsCode()
+    {
+        m_net.route(kAuth, FakeResponse::json("{}", 500));
+        AuthService service;
+        Captured c;
+        service.loginElyBy("steve", "secret", "c", QString(), c.callback());
+        QVERIFY(wait(c));
+        QCOMPARE(c.result.error, Loc::text("auth.error.serverCode").arg(500));
+    }
+
+    // --- authlib-injector -------------------------------------------------------
+
+    void injectorDownloadVerifyAndCache()
+    {
+        const QByteArray jar = "PK\x03\x04 fake authlib-injector";
+        m_net.route(kInjectorManifest, FakeResponse::json(QJsonObject{
+                                           {"build_number", 53}, {"version", "1.2.5"},
+                                           {"download_url", kInjectorJar},
+                                           {"checksums", QJsonObject{{"sha256", Fixtures::sha256(jar)}}}}));
+        m_net.route(kInjectorJar, FakeResponse::bytes(jar));
+
+        AuthService service;
+        QString path, error;
+        int calls = 0;
+        service.ensureAuthlibInjector(m_dir, [&](const QString &p, const QString &e) { ++calls; path = p; error = e; });
+        QTRY_COMPARE_WITH_TIMEOUT(calls, 1, 15000);
+        QVERIFY2(error.isEmpty(), qPrintable(error));
+        QCOMPARE(path, m_dir + "/authlib-injector.jar");
+        QCOMPARE(Fixtures::readFile(path), jar);
+
+        // Второй раз — сразу из файла.
+        calls = 0;
+        service.ensureAuthlibInjector(m_dir, [&](const QString &p, const QString &e) { ++calls; path = p; error = e; });
+        QCOMPARE(calls, 1);
+        QCOMPARE(m_net.hits(kInjectorJar), 1);
+    }
+
+    void injectorChecksumMismatch()
+    {
+        m_net.route(kInjectorManifest, FakeResponse::json(QJsonObject{
+                                           {"download_url", kInjectorJar},
+                                           {"checksums", QJsonObject{{"sha256", QString(64, u'0')}}}}));
+        m_net.route(kInjectorJar, FakeResponse::bytes("tampered"));
+        AuthService service;
+        QString path, error;
+        int calls = 0;
+        service.ensureAuthlibInjector(m_dir, [&](const QString &p, const QString &e) { ++calls; path = p; error = e; });
+        QTRY_COMPARE_WITH_TIMEOUT(calls, 1, 15000);
+        QCOMPARE(error, Loc::text("auth.ely.error.injectorChecksum"));
+        QVERIFY(path.isEmpty());
+        QVERIFY(!QFile::exists(m_dir + "/authlib-injector.jar"));
+    }
+
+    void injectorManifestProblems()
+    {
+        AuthService service;
+        QString error;
+        int calls = 0;
+        const auto cb = [&](const QString &, const QString &e) { ++calls; error = e; };
+
+        m_net.route(kInjectorManifest, FakeResponse::json(QJsonObject{{"version", "1.2.5"}}));
+        service.ensureAuthlibInjector(m_dir, cb);
+        QTRY_COMPARE_WITH_TIMEOUT(calls, 1, 15000);
+        QCOMPARE(error, Loc::text("auth.ely.error.injectorNoUrl"));
+
+        m_net.route(kInjectorManifest, FakeResponse::error(503));
+        service.ensureAuthlibInjector(m_dir, cb);
+        QTRY_COMPARE_WITH_TIMEOUT(calls, 2, 15000);
+        QVERIFY(error.startsWith(Loc::text("auth.ely.error.injectorInfoFailed").section(u'%', 0, 0)));
+
+        m_net.route(kInjectorManifest, FakeResponse::json(QJsonObject{{"download_url", kInjectorJar}}));
+        m_net.route(kInjectorJar, FakeResponse::error(404));
+        service.ensureAuthlibInjector(m_dir, cb);
+        QTRY_COMPARE_WITH_TIMEOUT(calls, 3, 15000);
+        QVERIFY(error.startsWith(Loc::text("auth.ely.error.injectorDownloadFailed").section(u'%', 0, 0)));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestAuthService)
+#include "tst_authservice.moc"
@@ -0,0 +1,135 @@
+// Самопроверка FakeInternet: если она красная, остальные сетевые тесты
+// бессмысленны — значит, перехват трафика на этой платформе не работает.
+
+#include "testenv.h"
+#include "fakeinternet.h"
+
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QSignalSpy>
+
+class TestFakeInternet : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+    QNetworkReply *get(QNetworkAccessManager &manager, const QString &url)
+    {
+        return manager.get(QNetworkRequest(QUrl(url)));
+    }
+
+    static bool waitFinished(QNetworkReply *reply)
+    {
+        if (reply->isFinished())
+            return true;
+        QSignalSpy spy(reply, &QNetworkReply::finished);
+        return spy.wait(15000);
+    }
+
+private slots:
+    void initTestCase()
+    {
+        QString error;
+        if (!m_net.start(&error))
+            QSKIP(qPrintable(QStringLiteral("FakeInternet недоступен: ") + error));
+    }
+
+    void init() { m_net.reset(); }
+
+    void httpsGetIsIntercepted()
+    {
+        m_net.route(QStringLiteral("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json"),
+                    FakeResponse::json(QByteArrayLiteral("{\"ok\":true}")));
+        QNetworkAccessManager manager;
+        QScopedPointer<QNetworkReply> reply(
+            get(manager, QStringLiteral("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json?x=1")));
+        QVERIFY(waitFinished(reply.data()));
+        QCOMPARE(reply->error(), QNetworkReply::NoError);
+        QCOMPARE(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(), 200);
+        QCOMPARE(reply->readAll(), QByteArrayLiteral("{\"ok\":true}"));
+        QCOMPARE(m_net.hits(QStringLiteral("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json")), 1);
+        QCOMPARE(m_net.requests().constFirst().query, QStringLiteral("x=1"));
+    }
+
+    void postBodyAndHeaders()
+    {
+        m_net.route(QStringLiteral("https://authserver.ely.by/auth/authenticate"),
+                    [](const FakeRequest &request) {
+                        return FakeResponse::json(request.body, request.method == "POST" ? 200 : 405);
+                    });
+        QNetworkAccessManager manager;
+        QNetworkRequest request(QUrl(QStringLiteral("https://authserver.ely.by/auth/authenticate")));
+        request.setHeader(QNetworkRequest::ContentTypeHeader, QStringLiteral("application/json"));
+        QScopedPointer<QNetworkReply> reply(manager.post(request, QByteArrayLiteral("{\"a\":1}")));
+        QVERIFY(waitFinished(reply.data()));
+        QCOMPARE(reply->readAll(), QByteArrayLiteral("{\"a\":1}"));
+        QCOMPARE(m_net.requests().constFirst().header("content-type"), QByteArrayLiteral("application/json"));
+    }
+
+    void prefixRoutesAndKeepAlive()
+    {
+        m_net.route(QStringLiteral("https://resources.download.minecraft.net/*"),
+                    [](const FakeRequest &request) { return FakeResponse::text(request.path.toUtf8()); });
+        QNetworkAccessManager manager;
+        for (int i = 0; i < 5; ++i) {
+            const QString path = QStringLiteral("/ab/ab%1").arg(i);
+            QScopedPointer<QNetworkReply> reply(
+                get(manager, QStringLiteral("https://resources.download.minecraft.net") + path));
+            QVERIFY(waitFinished(reply.data()));
+            QCOMPARE(reply->readAll(), path.toUtf8());
+        }
+        QCOMPARE(m_net.requests().size(), 5);
+    }
+
+    void unknownRouteIs404AndRecorded()
+    {
+        QNetworkAccessManager manager;
+        QTest::ignoreMessage(QtWarningMsg, QRegularExpression(QStringLiteral("FakeInternet: нет маршрута")));
+        QScopedPointer<QNetworkReply> reply(get(manager, QStringLiteral("https://example.invalid/x")));
+        QVERIFY(waitFinished(reply.data()));
+        QCOMPARE(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(), 404);
+        QCOMPARE(m_net.unmatched(), QStringList{QStringLiteral("https://example.invalid/x")});
+    }
+
+    void errorStatusesAndDrop()
+    {
+        m_net.route(QStringLiteral("https://a.test/500"), FakeResponse::error(500));
+        m_net.route(QStringLiteral("https://a.test/drop"), [] {
+            FakeResponse response;
+            response.drop = true;
+            return response;
+        }());
+        m_net.route(QStringLiteral("https://a.test/short"), [] {
+            FakeResponse response = FakeResponse::bytes(QByteArray(1000, 'x'));
+            response.truncateTo = 10;
+            return response;
+        }());
+
+        QNetworkAccessManager manager;
+        QScopedPointer<QNetworkReply> r500(get(manager, QStringLiteral("https://a.test/500")));
+        QVERIFY(waitFinished(r500.data()));
+        QCOMPARE(r500->error(), QNetworkReply::InternalServerError);
+
+        QScopedPointer<QNetworkReply> drop(get(manager, QStringLiteral("https://a.test/drop")));
+        QVERIFY(waitFinished(drop.data()));
+        QVERIFY(drop->error() != QNetworkReply::NoError);
+
+        QScopedPointer<QNetworkReply> shortReply(get(manager, QStringLiteral("https://a.test/short")));
+        QVERIFY(waitFinished(shortReply.data()));
+        QVERIFY(shortReply->error() != QNetworkReply::NoError);
+    }
+
+    void plainHttpThroughProxy()
+    {
+        m_net.route(QStringLiteral("http://plain.test/hello"), FakeResponse::text("hi"));
+        QNetworkAccessManager manager;
+        QScopedPointer<QNetworkReply> reply(get(manager, QStringLiteral("http://plain.test/hello")));
+        QVERIFY(waitFinished(reply.data()));
+        QCOMPARE(reply->readAll(), QByteArrayLiteral("hi"));
+        QCOMPARE(m_net.requests().constFirst().scheme, QStringLiteral("http"));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestFakeInternet)
+#include "tst_fakeinternet.moc"
@@ -0,0 +1,292 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "javainstaller.h"
+#include "javalocator.h"
+#include "javaruntime.h"
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QFileInfo>
+#include <QJsonDocument>
+#include <QSignalSpy>
+
+namespace {
+
+const QString kTemurin = QStringLiteral("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21/");
+const QString kMojangManifest = QStringLiteral("https://piston-meta.mojang.com/v1/packages/x/manifest.json");
+const QString kMojangFiles = QStringLiteral("https://piston-data.mojang.com/v1/objects/");
+
+JavaRuntimeEntry temurinEntry(const QString &archive, const QByteArray &data)
+{
+    JavaRuntimeEntry entry;
+    entry.id = QStringLiteral("temurin-jdk-21.0.2_13-test-") + QString(archive).replace(u'.', u'-');
+    entry.kind = JavaRuntimeKind::Jdk;
+    entry.major = 21;
+    entry.version = QStringLiteral("21.0.2+13");
+    entry.archive = archive;
+    entry.url = QUrl(kTemurin + "OpenJDK21U-jdk." + archive);
+    entry.checksum = Fixtures::sha256(data);
+    entry.size = data.size();
+    return entry;
+}
+
+// Раскладка архива Temurin: один корневой каталог с bin/java внутри.
+QMap<QString, QByteArray> jdkTree()
+{
+    return {{QStringLiteral("jdk-21.0.2+13/bin/") + Fixtures::javaExecutableName(), "#!/bin/sh\necho java\n"},
+            {QStringLiteral("jdk-21.0.2+13/lib/modules"), QByteArray(2048, 'm')},
+            {QStringLiteral("jdk-21.0.2+13/release"), "JAVA_VERSION=\"21.0.2\""}};
+}
+
+} // namespace
+
+class TestJavaInstaller : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_work;
+
+    struct Run
+    {
+        explicit Run(JavaInstaller &installer)
+            : started(&installer, &JavaInstaller::started)
+            , finished(&installer, &JavaInstaller::finished)
+            , failed(&installer, &JavaInstaller::failed)
+            , canceled(&installer, &JavaInstaller::canceled)
+        {}
+        bool waitEnd()
+        {
+            return QTest::qWaitFor([&] { return finished.count() + failed.count() + canceled.count() > 0; }, 30000);
+        }
+        QString failure() const { return failed.isEmpty() ? QString() : failed.constFirst().at(1).toString(); }
+        QSignalSpy started, finished, failed, canceled;
+    };
+
+    void verifyRegistered(const JavaRuntimeEntry &entry, const Run &run)
+    {
+        QCOMPARE(run.finished.count(), 1);
+        QCOMPARE(run.finished.constFirst().at(0).toString(), entry.id);
+        const QString javaPath = run.finished.constFirst().at(1).toString();
+        QVERIFY(QFileInfo(javaPath).isFile());
+        QVERIFY(javaPath.startsWith(JavaRuntimeStore::dirFor(entry.id) + u'/'));
+#if !defined(Q_OS_WIN)
+        QVERIFY(QFileInfo(javaPath).isExecutable());
+#endif
+        const auto installed = JavaRuntimeStore::find(entry.id);
+        QVERIFY(installed.has_value());
+        QCOMPARE(installed->major, entry.major);
+        QCOMPARE(installed->version, entry.version);
+        QCOMPARE(installed->kind, javaKindKey(entry.kind));
+        // Лаунчер видит её при поиске Java.
+        QStringList canonical;
+        for (const QString &path : JavaLocator::findAll(m_work))
+            canonical << QFileInfo(path).canonicalFilePath();
+        QVERIFY(canonical.contains(QFileInfo(javaPath).canonicalFilePath()));
+        // Скачанный архив за собой не оставляем.
+        QVERIFY(QDir(LauncherPaths::javaDownloadDir()).entryList(QDir::Files).isEmpty());
+    }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+        m_work = TestEnv::freshDir(QStringLiteral("game"));
+    }
+
+    void installsZipArchive()
+    {
+        const QByteArray zip = Fixtures::zipBytes(jdkTree());
+        const JavaRuntimeEntry entry = temurinEntry("zip", zip);
+        m_net.route(entry.url.toString(), FakeResponse::bytes(zip));
+
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(installer.isRunning());
+        QCOMPARE(run.started.count(), 1);
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyRegistered(entry, run);
+        QVERIFY(!installer.isRunning());
+    }
+
+    void installsTarGzArchive()
+    {
+#if defined(Q_OS_WIN)
+        QSKIP("Temurin под Windows — только zip; tar.gz распаковывается системным tar из PATH");
+#endif
+        const QString archive = m_work + "/jdk.tar.gz";
+        if (!Fixtures::makeTarGz(archive, jdkTree()))
+            QSKIP("системный tar недоступен");
+        const QByteArray data = Fixtures::readFile(archive);
+        const JavaRuntimeEntry entry = temurinEntry("tar.gz", data);
+        m_net.route(entry.url.toString(), FakeResponse::bytes(data));
+
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyRegistered(entry, run);
+    }
+
+    void archiveChecksumMismatch()
+    {
+        const QByteArray zip = Fixtures::zipBytes(jdkTree());
+        JavaRuntimeEntry entry = temurinEntry("zip", zip);
+        entry.checksum = QString(64, u'0');
+        m_net.route(entry.url.toString(), FakeResponse::bytes(zip));
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("java.error.archiveChecksum"));
+        QVERIFY(!QDir(JavaRuntimeStore::dirFor(entry.id)).exists());
+    }
+
+    void archiveWithoutJavaFails()
+    {
+        const QByteArray zip = Fixtures::zipBytes({{"jdk/README", "no binaries here"}});
+        const JavaRuntimeEntry entry = temurinEntry("zip", zip);
+        m_net.route(entry.url.toString(), FakeResponse::bytes(zip));
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("java.error.noExecutable"));
+        QVERIFY(!JavaRuntimeStore::find(entry.id).has_value());
+    }
+
+    void zipSlipIsRejected()
+    {
+        const QByteArray zip = Fixtures::zipBytes({{"jdk/../../../escaped", "x"}});
+        const JavaRuntimeEntry entry = temurinEntry("zip", zip);
+        m_net.route(entry.url.toString(), FakeResponse::bytes(zip));
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("java.error.archiveBadPath").arg("jdk/../../../escaped"));
+        QVERIFY(!QFile::exists(LauncherPaths::rootDir() + "/escaped"));
+    }
+
+    void unknownFormatAndInvalidEntry()
+    {
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(JavaRuntimeEntry{});
+        QCOMPARE(run.failure(), Loc::text("java.error.buildUnavailable"));
+
+        JavaRuntimeEntry entry = temurinEntry("7z", "x");
+        Run run2(installer);
+        installer.install(entry);
+        QCOMPARE(run2.failure(), Loc::text("java.error.unknownArchiveFormat").arg("7z"));
+    }
+
+    void mojangComponent()
+    {
+        const QByteArray java = "#!/bin/sh\necho mojang-java\n";
+        const QByteArray lib = QByteArray(1024, 'l');
+        const QString binary = QStringLiteral("bin/") + Fixtures::javaExecutableName();
+        QJsonObject files{
+            {"bin", QJsonObject{{"type", "directory"}}},
+            {binary, QJsonObject{{"type", "file"}, {"executable", true},
+                                 {"downloads", QJsonObject{{"raw", QJsonObject{
+                                                   {"url", kMojangFiles + Fixtures::sha1(java) + "/java"},
+                                                   {"sha1", Fixtures::sha1(java)}, {"size", java.size()}}}}}}},
+            {"lib/modules", QJsonObject{{"type", "file"},
+                                        {"downloads", QJsonObject{{"raw", QJsonObject{
+                                                          {"url", kMojangFiles + Fixtures::sha1(lib) + "/modules"},
+                                                          {"sha1", Fixtures::sha1(lib)}, {"size", lib.size()}}}}}}},
+            {"lib/modules-link", QJsonObject{{"type", "link"}, {"target", "modules"}}}};
+        m_net.route(kMojangManifest, FakeResponse::json(QJsonObject{{"files", files}}));
+        m_net.route(kMojangFiles + Fixtures::sha1(java) + "/java", FakeResponse::bytes(java));
+        int libAttempts = 0;
+        m_net.route(kMojangFiles + Fixtures::sha1(lib) + "/modules", [&](const FakeRequest &) {
+            return ++libAttempts == 1 ? FakeResponse::error(503) : FakeResponse::bytes(lib);   // временный сбой
+        });
+
+        JavaRuntimeEntry entry;
+        entry.id = QStringLiteral("mojang-java-runtime-delta");
+        entry.kind = JavaRuntimeKind::Mojang;
+        entry.major = 21;
+        entry.version = QStringLiteral("21.0.7");
+        entry.component = QStringLiteral("java-runtime-delta");
+        entry.archive = QStringLiteral("mojang");
+        entry.url = QUrl(kMojangManifest);
+
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyRegistered(entry, run);
+        QCOMPARE(libAttempts, 2);
+        const QString dir = JavaRuntimeStore::dirFor(entry.id);
+        QCOMPARE(Fixtures::readFile(dir + "/lib/modules"), lib);
+        QVERIFY(QFileInfo::exists(dir + "/lib/modules-link"));
+    }
+
+    void mojangManifestEscapingIsRejected()
+    {
+        m_net.route(kMojangManifest, FakeResponse::json(QJsonObject{
+                                         {"files", QJsonObject{{"../../evil", QJsonObject{{"type", "directory"}}}}}}));
+        JavaRuntimeEntry entry;
+        entry.id = QStringLiteral("mojang-evil");
+        entry.kind = JavaRuntimeKind::Mojang;
+        entry.major = 17;
+        entry.version = QStringLiteral("17");
+        entry.archive = QStringLiteral("mojang");
+        entry.url = QUrl(kMojangManifest);
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("java.error.manifestBadPath").arg("../../evil"));
+    }
+
+    void cancelDuringDownload()
+    {
+        FakeResponse hang;
+        hang.hang = true;
+        const JavaRuntimeEntry entry = temurinEntry("zip", "whatever");
+        m_net.route(entry.url.toString(), hang);
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QTRY_COMPARE_WITH_TIMEOUT(m_net.hits(entry.url.toString()), 1, 15000);
+        installer.cancel();
+        QVERIFY(run.waitEnd());
+        QVERIFY(!QDir(JavaRuntimeStore::dirFor(entry.id)).exists());
+        QVERIFY(!installer.isRunning());
+        QVERIFY(run.failed.isEmpty());
+        // abort() синхронно доводит ответ до handleArchiveFinished(), который уже
+        // шлёт canceled; затем cancel() видит m_reply == nullptr и шлёт его ещё раз.
+        QEXPECT_FAIL("", "canceled приходит дважды: из handleArchiveFinished() и из cancel()", Continue);
+        QCOMPARE(run.canceled.count(), 1);
+    }
+
+    void reinstallReplacesOld()
+    {
+        const QByteArray zip = Fixtures::zipBytes(jdkTree());
+        const JavaRuntimeEntry entry = temurinEntry("zip", zip);
+        Fixtures::write(JavaRuntimeStore::dirFor(entry.id) + "/stale/file", "old");
+        m_net.route(entry.url.toString(), FakeResponse::bytes(zip));
+        JavaInstaller installer;
+        Run run(installer);
+        installer.install(entry);
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        QVERIFY(!QFile::exists(JavaRuntimeStore::dirFor(entry.id) + "/stale/file"));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestJavaInstaller)
+#include "tst_javainstaller.moc"
@@ -0,0 +1,319 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "javaruntime.h"
+#include "javaruntimeservice.h"
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QJsonArray>
+#include <QSignalSpy>
+#include <QSysInfo>
+
+namespace {
+
+const QString kReleases = QStringLiteral("https://api.adoptium.net/v3/info/available_releases");
+const QString kFeature = QStringLiteral("https://api.adoptium.net/v3/assets/feature_releases/*");
+const QString kMojang = QStringLiteral(
+    "https://piston-meta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json");
+
+bool VersionLoaderOsIsWindows()
+{
+#if defined(Q_OS_WIN)
+    return true;
+#else
+    return false;
+#endif
+}
+
+QString hostAdoptiumArch()
+{
+    const QString arch = QSysInfo::currentCpuArchitecture();
+    if (arch == QLatin1String("arm64"))
+        return QStringLiteral("aarch64");
+    if (arch == QLatin1String("x86_64"))
+        return QStringLiteral("x64");
+    return arch;
+}
+
+// Один релиз Temurin в формате Adoptium API.
+QJsonObject release(int major, const QString &arch, const QString &openjdk, int security,
+                    const QString &timestamp, const QString &os)
+{
+    const QString ext = os == QLatin1String("windows") ? QStringLiteral("zip") : QStringLiteral("tar.gz");
+    QJsonArray binaries;
+    for (const QString type : {QStringLiteral("jdk"), QStringLiteral("jre"), QStringLiteral("testimage")}) {
+        const QString name = QStringLiteral("OpenJDK%1U-%2_%3_%4_hotspot.%5").arg(major).arg(type, arch, os, ext);
+        binaries << QJsonObject{
+            {"architecture", arch}, {"image_type", type}, {"os", os},
+            {"package", QJsonObject{{"name", name},
+                                    {"link", "https://github.com/adoptium/temurin/releases/download/x/" + name},
+                                    {"checksum", QString(64, u'c')},
+                                    {"size", 190000000}}}};
+    }
+    return QJsonObject{
+        {"release_name", QStringLiteral("jdk-%1").arg(openjdk)},
+        {"timestamp", timestamp},
+        {"binaries", binaries},
+        {"version_data", QJsonObject{{"major", major}, {"security", security},
+                                     {"openjdk_version", openjdk + "-LTS"}, {"semver", openjdk}}}};
+}
+
+QByteArray mojangAll()
+{
+    const QJsonObject components{
+        {"java-runtime-delta", QJsonArray{QJsonObject{
+             {"manifest", QJsonObject{{"url", "https://piston-meta.mojang.com/v1/packages/d/manifest.json"},
+                                      {"sha1", "dddd"}, {"size", 1000}}},
+             {"version", QJsonObject{{"name", "21.0.7"}, {"released", "2025-04-15T00:00:00+00:00"}}}}}},
+        {"jre-legacy", QJsonArray{QJsonObject{
+             {"manifest", QJsonObject{{"url", "https://piston-meta.mojang.com/v1/packages/l/manifest.json"},
+                                      {"sha1", "llll"}, {"size", 1000}}},
+             {"version", QJsonObject{{"name", "8u51"}, {"released", "2015-07-15T00:00:00+00:00"}}}}}},
+        {"java-runtime-alpha", QJsonArray{}},
+        {"minecraft-java-exe", QJsonArray{QJsonObject{
+             {"manifest", QJsonObject{{"url", "https://piston-meta.mojang.com/v1/packages/e/manifest.json"}}},
+             {"version", QJsonObject{{"name", "7.0"}}}}}},
+        {"insecure", QJsonArray{QJsonObject{
+             {"manifest", QJsonObject{{"url", "http://piston-meta.mojang.com/x.json"}}},
+             {"version", QJsonObject{{"name", "17.0.1"}}}}}}};
+    QJsonObject root;
+    for (const char *platform : {"gamecore", "linux", "linux-i386", "mac-os", "mac-os-arm64",
+                                 "windows-arm64", "windows-x64", "windows-x86"})
+        root.insert(QLatin1String(platform), components);
+    return QJsonDocument(root).toJson(QJsonDocument::Compact);
+}
+
+} // namespace
+
+class TestJavaRuntimeService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+    // Отвечает релизами на запрошенную архитектуру/ОС; без «missingForArch» — для всех.
+    void routeAdoptium(const QString &missingForArch = QString())
+    {
+        m_net.route(kReleases, FakeResponse::json(QJsonObject{
+                                   {"available_lts_releases", QJsonArray{8, 17, 21}},
+                                   {"available_releases", QJsonArray{8, 17, 21, 24}}}));
+        m_net.route(kFeature, [missingForArch](const FakeRequest &request) {
+            const int major = request.path.section(u'/', -2, -2).toInt();
+            const QString arch = request.queryItems().queryItemValue("architecture");
+            const QString os = request.queryItems().queryItemValue("os");
+            if (arch == missingForArch)
+                return FakeResponse::json("[]");
+            QJsonArray list;
+            if (major == 8) {
+                list << release(8, arch, "1.8.0_452-b09", 452, "2025-04-20T00:00:00Z", os);
+            } else {
+                list << release(major, arch, QStringLiteral("%1.0.2+13").arg(major), 2, "2025-01-20T00:00:00Z", os)
+                     << release(major, arch, QStringLiteral("%1.0.1+12").arg(major), 1, "2024-10-20T00:00:00Z", os);
+            }
+            return FakeResponse::json(QJsonDocument(list).toJson());
+        });
+    }
+
+    static bool load(JavaRuntimeService &service, CallResult &r, bool force = false)
+    {
+        service.ensureLoaded(r.callback(), force);
+        return QTest::qWaitFor([&] { return r.calls > 0; }, 20000);
+    }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+    }
+
+    void mergesAdoptiumAndMojang()
+    {
+        routeAdoptium();
+        m_net.route(kMojang, FakeResponse::json(mojangAll()));
+
+        JavaRuntimeService service;
+        QSignalSpy changed(&service, &JavaRuntimeService::catalogChanged);
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY2(r.ok, qPrintable(r.warning));
+        QVERIFY(r.warning.isEmpty());
+        QCOMPARE(changed.count(), 1);
+        QVERIFY(!service.isRefreshing());
+
+        // Запросы к Adoptium — с параметрами текущей машины.
+        const QList<FakeRequest> requests = m_net.requests();
+        int featureRequests = 0;
+        for (const FakeRequest &request : requests) {
+            if (!request.path.startsWith("/v3/assets/feature_releases/"))
+                continue;
+            ++featureRequests;
+            QCOMPARE(request.queryItems().queryItemValue("architecture"), hostAdoptiumArch());
+            QCOMPARE(request.queryItems().queryItemValue("image_type"), QString());
+            QCOMPARE(request.queryItems().queryItemValue("vendor"), QStringLiteral("eclipse"));
+        }
+        QCOMPARE(featureRequests, 4);
+
+        const QList<JavaRuntimeEntry> jdks = service.entries(JavaRuntimeKind::Jdk);
+        const QList<JavaRuntimeEntry> jres = service.entries(JavaRuntimeKind::Jre);
+        QCOMPARE(jdks.size(), 7);   // 8 — один релиз, 17/21/24 — по два
+        QCOMPARE(jres.size(), 7);
+        // Свежие major первыми, внутри — по дате.
+        QCOMPARE(jdks.first().major, 24);
+        QCOMPARE(jdks.first().version, QStringLiteral("24.0.2+13"));
+        QCOMPARE(jdks.last().major, 8);
+        QCOMPARE(jdks.last().version, QStringLiteral("8u452"));
+
+        const JavaRuntimeEntry jdk21 = jdks.at(2);
+        QCOMPARE(jdk21.major, 21);
+        QCOMPARE(jdk21.version, QStringLiteral("21.0.2+13"));   // «-LTS» отрезан
+        QVERIFY(jdk21.lts);
+        QVERIFY(!jdks.first().lts);                              // 24 — не LTS
+        QCOMPARE(jdk21.architecture, hostAdoptiumArch());
+        QCOMPARE(jdk21.size, qint64(190000000));
+        QCOMPARE(jdk21.archive, VersionLoaderOsIsWindows() ? QStringLiteral("zip") : QStringLiteral("tar.gz"));
+        QCOMPARE(jdk21.id, JavaRuntimeStore::sanitizeId("temurin-jdk-21.0.2+13-" + hostAdoptiumArch()));
+        QVERIFY(service.find(jdk21.id).has_value());
+
+        // Mojang: java-runtime-delta (21) и jre-legacy (8); пустые, exe и http — выброшены.
+        const QList<JavaRuntimeEntry> mojang = service.entries(JavaRuntimeKind::Mojang);
+        QCOMPARE(mojang.size(), 2);
+        const auto delta = service.find("mojang-java-runtime-delta");
+        QVERIFY(delta.has_value());
+        QCOMPARE(delta->major, 21);
+        QCOMPARE(delta->component, QStringLiteral("java-runtime-delta"));
+        QCOMPARE(delta->archive, QStringLiteral("mojang"));
+        QCOMPARE(delta->checksum, QStringLiteral("dddd"));
+        QCOMPARE(service.find("mojang-jre-legacy")->major, 8);
+
+        QVERIFY(QFile::exists(LauncherPaths::javaCatalogFile()));
+    }
+
+    void bestForPrefersSmallestSuitableMajorThenJdk()
+    {
+        routeAdoptium();
+        m_net.route(kMojang, FakeResponse::json(mojangAll()));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+
+        QVERIFY(!service.bestFor(0).has_value());
+        QVERIFY(!service.bestFor(99).has_value());
+        const auto for17 = service.bestFor(17);
+        QVERIFY(for17.has_value());
+        QCOMPARE(for17->major, 17);
+        QCOMPARE(for17->kind, JavaRuntimeKind::Jdk);
+        QCOMPARE(for17->version, QStringLiteral("17.0.2+13"));   // самый свежий релиз
+        QCOMPARE(service.bestFor(18)->major, 21);
+        QCOMPARE(service.bestFor(8)->major, 8);
+    }
+
+    void partialFailureStillProducesCatalog()
+    {
+        routeAdoptium();
+        m_net.route(kMojang, FakeResponse::error(500));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY(r.ok);
+        QVERIFY(r.warning.startsWith(Loc::text("java.error.mojangRuntimesFailed").section(u'%', 0, 0)));
+        QVERIFY(service.entries(JavaRuntimeKind::Mojang).isEmpty());
+        QVERIFY(!service.entries(JavaRuntimeKind::Jdk).isEmpty());
+    }
+
+    void adoptiumDownMojangUp()
+    {
+        m_net.route(kReleases, FakeResponse::error(503));
+        m_net.route(kMojang, FakeResponse::json(mojangAll()));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY(r.ok);
+        QVERIFY(!r.warning.isEmpty());
+        QCOMPARE(service.entries(JavaRuntimeKind::Mojang).size(), 2);
+        QVERIFY(service.entries(JavaRuntimeKind::Jdk).isEmpty());
+    }
+
+    void everythingDownWithoutCacheFails()
+    {
+        m_net.route(kReleases, FakeResponse::error(503));
+        m_net.route(kMojang, FakeResponse::error(503));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY(!r.ok);
+        QVERIFY(r.warning.contains("; "));   // оба предупреждения склеены
+        QVERIFY(!service.hasData());
+    }
+
+    void everythingDownWithCacheUsesCache()
+    {
+        routeAdoptium();
+        m_net.route(kMojang, FakeResponse::json(mojangAll()));
+        {
+            JavaRuntimeService service;
+            CallResult r;
+            QVERIFY(load(service, r));
+        }
+        m_net.reset();
+        m_net.route(kReleases, FakeResponse::error(503));
+        m_net.route(kMojang, FakeResponse::error(503));
+
+        JavaRuntimeService service;
+        CallResult cached;
+        QVERIFY(load(service, cached));
+        QVERIFY(cached.ok);
+        QVERIFY(m_net.requests().isEmpty());   // кеш свежий — сети нет
+        QCOMPARE(service.entries(JavaRuntimeKind::Jdk).size(), 7);
+
+        CallResult forced;
+        QVERIFY(load(service, forced, true));
+        QVERIFY(forced.ok);
+        QVERIFY(!forced.warning.isEmpty());
+        QCOMPARE(service.entries(JavaRuntimeKind::Jdk).size(), 7);
+    }
+
+    void cacheForOtherPlatformIsIgnored()
+    {
+        QJsonObject entry;
+        entry["id"] = "x";
+        entry["kind"] = "jdk";
+        entry["major"] = 17;
+        entry["url"] = "https://x/y.zip";
+        QJsonObject cache;
+        cache["platform"] = "amiga-os";
+        cache["fetchedAt"] = QDateTime::currentDateTimeUtc().toString(Qt::ISODate);
+        cache["entries"] = QJsonArray{entry};
+        Fixtures::writeJson(LauncherPaths::javaCatalogFile(), cache);
+        m_net.route(kReleases, FakeResponse::error(503));
+        m_net.route(kMojang, FakeResponse::error(503));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY(!service.hasData());
+        QVERIFY(!r.ok);
+    }
+
+    void aarch64FallsBackToX64()
+    {
+        if (hostAdoptiumArch() != QLatin1String("aarch64"))
+            QSKIP("запасной x64 запрашивается только на ARM-машинах");
+        routeAdoptium(QStringLiteral("aarch64"));
+        m_net.route(kMojang, FakeResponse::json(mojangAll()));
+        JavaRuntimeService service;
+        CallResult r;
+        QVERIFY(load(service, r));
+        QVERIFY(r.ok);
+        const QList<JavaRuntimeEntry> jdks = service.entries(JavaRuntimeKind::Jdk);
+        QVERIFY(!jdks.isEmpty());
+        for (const JavaRuntimeEntry &entry : jdks)
+            QCOMPARE(entry.architecture, QStringLiteral("x64"));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestJavaRuntimeService)
+#include "tst_javaruntimeservice.moc"
@@ -0,0 +1,273 @@
+#include "testenv.h"
+#include "fakemojang.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+#include "minecraftversion.h"
+#include "modloaderinstaller.h"
+#include "modloaderversionservice.h"
+#include "versioninstaller.h"
+#include "versionmanifestservice.h"
+#include "zlibreference.h"
+
+#include <QDir>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QSignalSpy>
+
+namespace {
+
+const QString kFabricList = QStringLiteral("https://meta.fabricmc.net/v2/versions/loader/1.20.1");
+const QString kFabricProfile = QStringLiteral("https://meta.fabricmc.net/v2/versions/loader/1.20.1/0.16.10/profile/json");
+const QString kForgeMeta = QStringLiteral("https://maven.minecraftforge.net/net/minecraftforge/forge/maven-metadata.xml");
+const QString kForgePromos = QStringLiteral("https://files.minecraftforge.net/maven/net/minecraftforge/forge/promotions_slim.json");
+const QString kForgeInstaller = QStringLiteral(
+    "https://maven.minecraftforge.net/net/minecraftforge/forge/1.20.1-47.4.0/forge-1.20.1-47.4.0-installer.jar");
+
+QByteArray fabricProfile(const QString &inherits = QStringLiteral("1.20.1"))
+{
+    // Профиль Fabric: дочерняя версия с собственной библиотекой из Maven Fabric.
+    const QJsonObject json{
+        {"id", "fabric-loader-0.16.10-1.20.1"},
+        {"inheritsFrom", inherits},
+        {"type", "release"},
+        {"mainClass", "net.fabricmc.loader.impl.launch.knot.KnotClient"},
+        {"arguments", QJsonObject{{"game", QJsonArray{}}, {"jvm", QJsonArray{"-DFabricMcEmu= net.minecraft.client.main.Main "}}}},
+        {"libraries", QJsonArray{QJsonObject{{"name", "net.fabricmc:fabric-loader:0.16.10"},
+                                             {"url", "https://maven.fabricmc.net/"}}}}};
+    return QJsonDocument(json).toJson(QJsonDocument::Compact);
+}
+
+} // namespace
+
+class TestModLoaderInstaller : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_game;
+
+    struct Rig
+    {
+        VersionManifestService manifest;
+        ModLoaderVersionService meta;
+        VersionInstaller versions{&manifest};
+        ModLoaderInstaller installer{&meta, &versions};
+        QSignalSpy finished{&installer, &ModLoaderInstaller::finished};
+        QSignalSpy failed{&installer, &ModLoaderInstaller::failed};
+        QSignalSpy canceled{&installer, &ModLoaderInstaller::canceled};
+        QSignalSpy log{&installer, &ModLoaderInstaller::log};
+
+        bool waitEnd()
+        {
+            return QTest::qWaitFor([&] { return finished.count() + failed.count() + canceled.count() > 0; }, 30000);
+        }
+        QString failure() const { return failed.isEmpty() ? QString() : failed.constFirst().at(1).toString(); }
+    };
+
+    void routeForge()
+    {
+        m_net.route(kForgeMeta, FakeResponse::bytes(Fixtures::read("loaders/forge-maven-metadata.xml")));
+        m_net.route(kForgePromos, FakeResponse::json(Fixtures::read("loaders/forge-promotions_slim.json")));
+        m_net.route(kForgeInstaller, FakeResponse::bytes("PK fake forge installer"));
+    }
+
+    // Подставная java, которая ведёт себя как установщик Forge: кладёт профиль версии.
+    QString forgeLikeJava(const QStringList &extra = {})
+    {
+        const QString id = QStringLiteral("1.20.1-forge-47.4.0");
+        const QString json = QStringLiteral(
+            "{\"id\":\"%1\",\"inheritsFrom\":\"1.20.1\",\"mainClass\":\"cpw.mods.bootstraplauncher.BootstrapLauncher\"}").arg(id);
+        QStringList config{"args_file=" + m_game + "/installer-args.txt",
+                           "dump_env=LD_PRELOAD",
+                           "stdout=Extracting json",
+                           "stdout=The client installed successfully"};
+        config << "create=" + m_game + "/versions/" + id + u'/' + id + ".json\t" + json;
+        config += extra;
+        return Fixtures::installFakeJava(m_game + "/jdk17", "17.0.8", config);
+    }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        m_net.route(kFabricList, FakeResponse::json(Fixtures::read("loaders/fabric-1.20.1.json")));
+        m_net.route("https://maven.fabricmc.net/net/fabricmc/fabric-loader/0.16.10/fabric-loader-0.16.10.jar",
+                    FakeResponse::bytes("fabric-loader-jar"));
+    }
+
+    void fabricInstallsBaseThenProfile()
+    {
+        m_net.route(kFabricProfile, FakeResponse::json(fabricProfile()));
+        Rig rig;
+        QSignalSpy started(&rig.installer, &ModLoaderInstaller::started);
+        rig.installer.install(m_game, ModLoader::Fabric, "1.20.1", "0.16.10", QString());
+        QVERIFY(rig.installer.isRunning());
+        QCOMPARE(started.count(), 1);
+        QVERIFY(rig.waitEnd());
+        QVERIFY2(rig.failed.isEmpty(), qPrintable(rig.failure()));
+        const QList<QVariant> done = rig.finished.constFirst();
+        QCOMPARE(done.at(0).toString(), QStringLiteral("fabric"));
+        QCOMPARE(done.at(1).toString(), QStringLiteral("1.20.1"));
+        QCOMPARE(done.at(2).toString(), QStringLiteral("0.16.10"));
+        QCOMPARE(done.at(3).toString(), QStringLiteral("fabric-loader-0.16.10-1.20.1"));
+        QVERIFY(!rig.installer.isRunning());
+
+        // Ваниль докачана, профиль сохранён, библиотека загрузчика на месте.
+        QVERIFY(QFile::exists(m_game + "/versions/1.20.1/1.20.1.jar"));
+        QVERIFY(QFile::exists(m_game + "/versions/fabric-loader-0.16.10-1.20.1/fabric-loader-0.16.10-1.20.1.json"));
+        QCOMPARE(Fixtures::readFile(m_game + "/libraries/net/fabricmc/fabric-loader/0.16.10/fabric-loader-0.16.10.jar"),
+                 QByteArray("fabric-loader-jar"));
+        const MinecraftVersion v = VersionLoader::load(m_game, "fabric-loader-0.16.10-1.20.1", {}, nullptr);
+        QVERIFY(v.isValid());
+    }
+
+    void fabricProfileForWrongGameIsRejected()
+    {
+        m_net.route(kFabricProfile, FakeResponse::json(fabricProfile("1.19.4")));
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Fabric, "1.20.1", "0.16.10", QString());
+        QVERIFY(rig.waitEnd());
+        QCOMPARE(rig.failure(), Loc::text("loader.error.descriptionWrongMinecraft")
+                                    .arg(loaderTitle(ModLoader::Fabric), "1.19.4", "1.20.1"));
+        QVERIFY(!QDir(m_game + "/versions/fabric-loader-0.16.10-1.20.1").exists());
+    }
+
+    void fabricProfileWithUnsafeIdIsRejected()
+    {
+        m_net.route(kFabricProfile, FakeResponse::json(QJsonObject{{"id", "../evil"}, {"inheritsFrom", "1.20.1"}}));
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Fabric, "1.20.1", "0.16.10", QString());
+        QVERIFY(rig.waitEnd());
+        QCOMPARE(rig.failure(), Loc::text("loader.error.descriptionBadId").arg(loaderTitle(ModLoader::Fabric)));
+    }
+
+    void validationErrors()
+    {
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Fabric, "1.20.1", " ", QString());
+        QCOMPARE(rig.failure(), Loc::text("loader.error.noVersionSelected").arg(loaderTitle(ModLoader::Fabric)));
+        QVERIFY(!rig.installer.isRunning());
+    }
+
+    void secondInstallWhileBusy()
+    {
+        FakeResponse slow = FakeResponse::json(fabricProfile());
+        slow.delayMs = 500;
+        m_net.route(kFabricProfile, slow);
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Fabric, "1.20.1", "0.16.10", QString());
+        rig.installer.install(m_game, ModLoader::Quilt, "1.20.1", "0.26.3", QString());
+        QCOMPARE(rig.failed.count(), 1);
+        QCOMPARE(rig.failure(), Loc::text("loader.error.installInProgress"));
+        QTRY_COMPARE_WITH_TIMEOUT(rig.finished.count(), 1, 30000);
+    }
+
+    void forgeRunsInstallerWithJava()
+    {
+        routeForge();
+        const QString java = forgeLikeJava();
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "47.4.0", java);
+        QVERIFY(rig.waitEnd());
+        QVERIFY2(rig.failed.isEmpty(), qPrintable(rig.failure()));
+        QCOMPARE(rig.finished.constFirst().at(3).toString(), QStringLiteral("1.20.1-forge-47.4.0"));
+
+        // Установщик запущен как java -jar <installer> --installClient <папка игры>.
+        const QStringList args = QString::fromLocal8Bit(Fixtures::readFile(m_game + "/installer-args.txt"))
+                                     .split(u'\n', Qt::SkipEmptyParts);
+        QCOMPARE(args.value(0), QStringLiteral("-jar"));
+        QCOMPARE(QFileInfo(args.value(1)).fileName(), QStringLiteral("forge-47.4.0-installer.jar"));
+        QCOMPARE(args.value(2), QStringLiteral("--installClient"));
+        QCOMPARE(args.value(3), QDir::toNativeSeparators(m_game));
+        // Заглушка launcher_profiles.json, без которой установщик Forge отказывается работать.
+        QVERIFY(Fixtures::readJsonFile(m_game + "/launcher_profiles.json").contains("profiles"));
+        // Вывод установщика идёт в журнал.
+        QStringList lines;
+        for (const auto &call : rig.log)
+            lines << call.constFirst().toString();
+        QVERIFY(lines.contains("The client installed successfully"));
+        QVERIFY(QFile::exists(LauncherPaths::loaderDownloadDir() + "/forge-47.4.0-install.log"));
+    }
+
+    void forgeInstallerFailureCleansUp()
+    {
+        routeForge();
+        const QString java = forgeLikeJava({"exit=1", "stdout=Processor failed, invalid outputs"});
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "47.4.0", java);
+        QVERIFY(rig.waitEnd());
+        const QString failure = rig.failure();
+        QVERIFY(failure.startsWith(Loc::text("loader.error.installerExitCode").arg(loaderTitle(ModLoader::Forge)).arg(1)));
+        QVERIFY(failure.contains("Processor failed"));   // хвост лога в сообщении
+        // Версию, которую успел создать упавший установщик, убираем.
+        QVERIFY(!QDir(m_game + "/versions/1.20.1-forge-47.4.0").exists());
+        QVERIFY(QDir(m_game + "/versions/1.20.1").exists());
+    }
+
+    void forgeInstallerProducingNothing()
+    {
+        routeForge();
+        const QString java = Fixtures::installFakeJava(m_game + "/jdk17-empty", "17.0.8", {"stdout=did nothing"});
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "47.4.0", java);
+        QVERIFY(rig.waitEnd());
+        QVERIFY(rig.failure().startsWith(Loc::text("loader.error.noVersionProduced").section(u'%', 0, 0)));
+    }
+
+    void forgeUnknownVersionIsIncompatible()
+    {
+        routeForge();
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "1.0.0", QString());
+        QVERIFY(rig.waitEnd());
+        QCOMPARE(rig.failure(), Loc::text("loader.error.incompatible").arg(loaderTitle(ModLoader::Forge), "1.0.0", "1.20.1"));
+    }
+
+    void zlibNgEnvironmentOnLinux()
+    {
+#if !defined(Q_OS_LINUX)
+        QSKIP("LD_PRELOAD с эталонным zlib — только Linux");
+#else
+        routeForge();
+        const QString java = forgeLikeJava();
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "47.4.0", java);
+        QVERIFY(rig.waitEnd());
+        const QStringList args = QString::fromLocal8Bit(Fixtures::readFile(m_game + "/installer-args.txt"))
+                                     .split(u'\n', Qt::SkipEmptyParts);
+        const QString preload = args.filter("env:LD_PRELOAD=").value(0).mid(int(sizeof("env:LD_PRELOAD=") - 1));
+        if (ZlibReference::systemIsZlibNg() && !ZlibReference::bundledPath().isEmpty())
+            QVERIFY(preload.startsWith(ZlibReference::bundledPath()));
+        else
+            QCOMPARE(preload, qEnvironmentVariable("LD_PRELOAD"));
+#endif
+    }
+
+    void cancelDuringInstallerDownload()
+    {
+        routeForge();
+        FakeResponse hang;
+        hang.hang = true;
+        m_net.route(kForgeInstaller, hang);
+        Rig rig;
+        rig.installer.install(m_game, ModLoader::Forge, "1.20.1", "47.4.0", QString());
+        QTRY_COMPARE_WITH_TIMEOUT(m_net.hits(kForgeInstaller), 1, 30000);
+        rig.installer.cancel();
+        QVERIFY(rig.waitEnd());
+        QCOMPARE(rig.canceled.count(), 1);
+        QVERIFY(rig.failed.isEmpty());
+        QVERIFY(!rig.installer.isRunning());
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestModLoaderInstaller)
+#include "tst_modloaderinstaller.moc"
@@ -0,0 +1,274 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+#include "modloaderversionservice.h"
+
+#include <QSignalSpy>
+
+namespace {
+const QString kFabric = QStringLiteral("https://meta.fabricmc.net/v2/versions/loader/1.20.1");
+const QString kQuilt = QStringLiteral("https://meta.quiltmc.org/v3/versions/loader/1.20.1");
+const QString kForgeMeta = QStringLiteral("https://maven.minecraftforge.net/net/minecraftforge/forge/maven-metadata.xml");
+const QString kForgePromos = QStringLiteral("https://files.minecraftforge.net/maven/net/minecraftforge/forge/promotions_slim.json");
+const QString kNeoMeta = QStringLiteral("https://maven.neoforged.net/releases/net/neoforged/neoforge/maven-metadata.xml");
+const QString kNeoLegacyMeta = QStringLiteral("https://maven.neoforged.net/releases/net/neoforged/forge/maven-metadata.xml");
+
+FakeResponse xml(const QByteArray &body)
+{
+    FakeResponse response = FakeResponse::bytes(body);
+    response.contentType = "application/xml";
+    return response;
+}
+
+QStringList loaderVersions(const QList<LoaderVersionEntry> &list)
+{
+    QStringList out;
+    for (const LoaderVersionEntry &entry : list)
+        out << entry.loaderVersion;
+    return out;
+}
+} // namespace
+
+class TestModLoaderVersionService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+    void routeAll()
+    {
+        m_net.route(kFabric, FakeResponse::json(Fixtures::read("loaders/fabric-1.20.1.json")));
+        m_net.route(kQuilt, FakeResponse::json(Fixtures::read("loaders/quilt-1.20.1.json")));
+        m_net.route(kForgeMeta, xml(Fixtures::read("loaders/forge-maven-metadata.xml")));
+        m_net.route(kForgePromos, FakeResponse::json(Fixtures::read("loaders/forge-promotions_slim.json")));
+        m_net.route(kNeoMeta, xml(Fixtures::read("loaders/neoforge-maven-metadata.xml")));
+        m_net.route(kNeoLegacyMeta, xml(Fixtures::read("loaders/neoforge-legacy-maven-metadata.xml")));
+    }
+
+    static bool load(ModLoaderVersionService &service, ModLoader loader, const QString &game,
+                     CallResult &r, bool force = false)
+    {
+        service.ensureLoaded(loader, game, r.callback(), force);
+        return QTest::qWaitFor([&] { return r.calls > 0; }, 15000);
+    }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+        routeAll();
+    }
+
+    void fabric()
+    {
+        ModLoaderVersionService service;
+        QSignalSpy changed(&service, &ModLoaderVersionService::versionsChanged);
+        CallResult r;
+        QVERIFY(load(service, ModLoader::Fabric, "1.20.1", r));
+        QVERIFY2(r.ok, qPrintable(r.warning));
+
+        const QList<LoaderVersionEntry> list = service.versions(ModLoader::Fabric, "1.20.1");
+        // Новые первыми: 0.16.10 > 0.16.9 (числовое сравнение, не строковое); пустые версии выброшены.
+        QCOMPARE(loaderVersions(list), QStringList({"0.17.0-beta.1", "0.16.10", "0.16.9"}));
+        QCOMPARE(list.at(1).versionId, QStringLiteral("fabric-loader-0.16.10-1.20.1"));
+        QCOMPARE(list.at(1).gameVersion, QStringLiteral("1.20.1"));
+        QVERIFY(list.at(1).stable);
+        QVERIFY(!list.at(0).stable);
+        QVERIFY(list.at(1).installerUrl.isEmpty());
+        QCOMPARE(changed.count(), 1);
+        QCOMPARE(changed.constFirst().at(0).toString(), QStringLiteral("fabric"));
+        QCOMPARE(changed.constFirst().at(1).toString(), QStringLiteral("1.20.1"));
+
+        QVERIFY(service.find(ModLoader::Fabric, "1.20.1", "0.16.9").has_value());
+        QVERIFY(!service.find(ModLoader::Fabric, "1.20.1", "9.9.9").has_value());
+        QVERIFY(service.versions(ModLoader::Fabric, "1.19.2").isEmpty());
+        QVERIFY(QFile::exists(LauncherPaths::loaderCacheFile("fabric")));
+    }
+
+    void quiltStabilityHeuristic()
+    {
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::Quilt, "1.20.1", r));
+        QVERIFY(r.ok);
+        const QList<LoaderVersionEntry> list = service.versions(ModLoader::Quilt, "1.20.1");
+        QCOMPARE(loaderVersions(list), QStringList({"0.26.4-beta.1", "0.26.3"}));
+        QCOMPARE(list.at(0).versionId, QStringLiteral("quilt-loader-0.26.4-beta.1-1.20.1"));
+        QVERIFY(!list.at(0).stable);   // поля stable нет — решает «beta» в номере
+        QVERIFY(list.at(1).stable);
+    }
+
+    void forgeMergesPromotions()
+    {
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::Forge, "1.20.1", r));
+        QVERIFY2(r.ok, qPrintable(r.warning));
+        QCOMPARE(m_net.hits(kForgeMeta), 1);
+        QCOMPARE(m_net.hits(kForgePromos), 1);
+
+        const QList<LoaderVersionEntry> v1201 = service.versions(ModLoader::Forge, "1.20.1");
+        QCOMPARE(loaderVersions(v1201), QStringList({"47.4.1", "47.4.0", "47.3.0"}));
+        for (const LoaderVersionEntry &entry : v1201)
+            QCOMPARE(entry.recommended, entry.loaderVersion == QLatin1String("47.4.0"));
+        QCOMPARE(v1201.at(1).installerUrl,
+                 QUrl("https://maven.minecraftforge.net/net/minecraftforge/forge/1.20.1-47.4.0/forge-1.20.1-47.4.0-installer.jar"));
+        QVERIFY(v1201.at(1).versionId.isEmpty());   // id Forge узнаём только после установки
+
+        // Весь каталог Forge — одним запросом, по всем версиям игры.
+        const QList<LoaderVersionEntry> v1211 = service.versions(ModLoader::Forge, "1.21.1");
+        QCOMPARE(loaderVersions(v1211), QStringList({"52.0.10", "52.0.2-beta"}));
+        QVERIFY(!v1211.at(1).stable);
+        QCOMPARE(loaderVersions(service.versions(ModLoader::Forge, "1.7.10")),
+                 QStringList{"10.13.4.1614-1.7.10"});
+
+        // Другая версия игры у Forge не требует нового запроса.
+        CallResult again;
+        QVERIFY(load(service, ModLoader::Forge, "1.21.1", again));
+        QCOMPARE(m_net.hits(kForgeMeta), 1);
+    }
+
+    void forgeWithoutPromotionsStillWorks()
+    {
+        m_net.route(kForgePromos, FakeResponse::error(500));
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::Forge, "1.20.1", r));
+        QVERIFY(r.ok);
+        for (const LoaderVersionEntry &entry : service.versions(ModLoader::Forge, "1.20.1"))
+            QVERIFY(!entry.recommended);
+    }
+
+    void neoForgeBothSchemes()
+    {
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::NeoForge, "1.21.1", r));
+        QVERIFY2(r.ok, qPrintable(r.warning));
+
+        QCOMPARE(loaderVersions(service.versions(ModLoader::NeoForge, "1.21.1")),
+                 QStringList({"21.1.248", "21.1.200"}));
+        QCOMPARE(loaderVersions(service.versions(ModLoader::NeoForge, "1.21")), QStringList{"21.0.10"});
+        QCOMPARE(loaderVersions(service.versions(ModLoader::NeoForge, "1.20.4")),
+                 QStringList({"20.4.237", "20.4.80-beta"}));
+        // Новая нумерация (год.выпуск.патч.сборка).
+        QCOMPARE(loaderVersions(service.versions(ModLoader::NeoForge, "26.1")), QStringList{"26.1.0.5"});
+        QCOMPARE(loaderVersions(service.versions(ModLoader::NeoForge, "26.1.1")), QStringList{"26.1.1.3"});
+        QCOMPARE(service.find(ModLoader::NeoForge, "1.21.1", "21.1.248")->installerUrl,
+                 QUrl("https://maven.neoforged.net/releases/net/neoforged/neoforge/21.1.248/neoforge-21.1.248-installer.jar"));
+    }
+
+    void neoForgeLegacyArtifactArrivesLast()
+    {
+        // Ранние сборки под 1.20.1 — из старого артефакта net.neoforged:forge.
+        FakeResponse legacySlow = xml(Fixtures::read("loaders/neoforge-legacy-maven-metadata.xml"));
+        legacySlow.delayMs = 400;
+        m_net.route(kNeoLegacyMeta, legacySlow);
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::NeoForge, "1.20.1", r));
+        QVERIFY(r.ok);
+        const QList<LoaderVersionEntry> legacy = service.versions(ModLoader::NeoForge, "1.20.1");
+        QCOMPARE(loaderVersions(legacy), QStringList({"47.1.106", "47.1.79"}));
+        QCOMPARE(legacy.at(0).installerUrl,
+                 QUrl("https://maven.neoforged.net/releases/net/neoforged/forge/1.20.1-47.1.106/forge-1.20.1-47.1.106-installer.jar"));
+    }
+
+    void neoForgeLegacyArtifactArrivesFirst()
+    {
+        // Тот же каталог, но маленький legacy-ответ приходит раньше основного.
+        FakeResponse primarySlow = xml(Fixtures::read("loaders/neoforge-maven-metadata.xml"));
+        primarySlow.delayMs = 400;
+        m_net.route(kNeoMeta, primarySlow);
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::NeoForge, "1.20.1", r));
+        QVERIFY(r.ok);
+        QCOMPARE(service.versions(ModLoader::NeoForge, "1.21.1").size(), 2);
+        // В startRefresh() основной ответ делает state->merged = parsed и затирает
+        // уже слитые записи legacy — версии NeoForge для 1.20.1 пропадают.
+        QEXPECT_FAIL("", "гонка: основной maven-metadata NeoForge затирает уже пришедший legacy", Continue);
+        QCOMPARE(service.versions(ModLoader::NeoForge, "1.20.1").size(), 2);
+    }
+
+    void primaryFailureIsError()
+    {
+        m_net.route(kNeoMeta, FakeResponse::error(503));
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::NeoForge, "1.21.1", r));
+        QVERIFY(!r.ok);
+        QVERIFY(r.warning.contains(loaderTitle(ModLoader::NeoForge)));
+
+        m_net.route(kForgeMeta, xml("<metadata><versioning><versions></versions></versioning></metadata>"));
+        CallResult empty;
+        QVERIFY(load(service, ModLoader::Forge, "1.20.1", empty));
+        QVERIFY(!empty.ok);
+        QCOMPARE(empty.warning, Loc::text("loader.error.versionsUnparsable").arg(loaderTitle(ModLoader::Forge)));
+
+        m_net.route(kFabric, FakeResponse::json("{\"not\": \"an array\"}"));
+        CallResult notArray;
+        QVERIFY(load(service, ModLoader::Fabric, "1.20.1", notArray));
+        QVERIFY(!notArray.ok);
+        QCOMPARE(notArray.warning, Loc::text("loader.error.versionsUnparsable").arg(loaderTitle(ModLoader::Fabric)));
+    }
+
+    void cachePerLoaderAndOfflineFallback()
+    {
+        {
+            ModLoaderVersionService service;
+            CallResult r;
+            QVERIFY(load(service, ModLoader::Fabric, "1.20.1", r));
+        }
+        QCOMPARE(m_net.hits(kFabric), 1);
+
+        ModLoaderVersionService service;
+        CallResult cached;
+        QVERIFY(load(service, ModLoader::Fabric, "1.20.1", cached));
+        QVERIFY(cached.ok);
+        QCOMPARE(m_net.hits(kFabric), 1);   // свежий кеш
+        QCOMPARE(service.versions(ModLoader::Fabric, "1.20.1").size(), 3);
+
+        // Сеть легла, принудительное обновление: данные остаются, ok с предупреждением.
+        m_net.route(kFabric, FakeResponse::error(502));
+        CallResult offline;
+        QVERIFY(load(service, ModLoader::Fabric, "1.20.1", offline, true));
+        QVERIFY(offline.ok);
+        QVERIFY(!offline.warning.isEmpty());
+        QCOMPARE(service.versions(ModLoader::Fabric, "1.20.1").size(), 3);
+    }
+
+    void emptyGameVersionIsNoop()
+    {
+        ModLoaderVersionService service;
+        CallResult r;
+        QVERIFY(load(service, ModLoader::Fabric, "  ", r));
+        QVERIFY(r.ok);
+        QVERIFY(m_net.requests().isEmpty());
+    }
+
+    void inFlightRequestsAreShared()
+    {
+        FakeResponse slow = FakeResponse::json(Fixtures::read("loaders/fabric-1.20.1.json"));
+        slow.delayMs = 300;
+        m_net.route(kFabric, slow);
+        ModLoaderVersionService service;
+        CallResult a, b;
+        service.ensureLoaded(ModLoader::Fabric, "1.20.1", a.callback());
+        QVERIFY(service.isRefreshing(ModLoader::Fabric, "1.20.1"));
+        QVERIFY(!service.isRefreshing(ModLoader::Fabric, "1.19.2"));
+        service.ensureLoaded(ModLoader::Fabric, "1.20.1", b.callback());
+        QTRY_VERIFY_WITH_TIMEOUT(a.calls == 1 && b.calls == 1, 15000);
+        QCOMPARE(m_net.hits(kFabric), 1);
+        QVERIFY(!service.isRefreshing(ModLoader::Fabric, "1.20.1"));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestModLoaderVersionService)
+#include "tst_modloaderversionservice.moc"
@@ -0,0 +1,262 @@
+#include "testenv.h"
+#include "nettest.h"
+
+#include "authservice.h"
+#include "localization.h"
+#include "msaauthservice.h"
+
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QSignalSpy>
+
+namespace {
+
+const QString kToken = QStringLiteral("https://login.live.com/oauth20_token.srf");
+const QString kXbl = QStringLiteral("https://user.auth.xboxlive.com/user/authenticate");
+const QString kXsts = QStringLiteral("https://xsts.auth.xboxlive.com/xsts/authorize");
+const QString kMcLogin = QStringLiteral("https://api.minecraftservices.com/authentication/login_with_xbox");
+const QString kEntitlements = QStringLiteral("https://api.minecraftservices.com/entitlements/mcstore");
+const QString kProfile = QStringLiteral("https://api.minecraftservices.com/minecraft/profile");
+
+QJsonObject jsonBody(const FakeRequest &request)
+{
+    return QJsonDocument::fromJson(request.body).object();
+}
+
+struct Captured
+{
+    int calls = 0;
+    AuthResult result;
+    auto callback()
+    {
+        return [this](const AuthResult &r) { ++calls; result = r; };
+    }
+};
+
+} // namespace
+
+class TestMsaAuthService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+    // Полностью рабочая цепочка Microsoft → Xbox → XSTS → Minecraft.
+    void routeHappyPath()
+    {
+        m_net.route(kToken, [](const FakeRequest &request) {
+            const QUrlQuery form = request.formItems();
+            const QString grant = form.queryItemValue("grant_type");
+            if (grant == QLatin1String("authorization_code") && form.queryItemValue("code") == QLatin1String("good-code"))
+                return FakeResponse::json(QJsonObject{{"access_token", "ms-access"}, {"refresh_token", "ms-refresh-2"}});
+            if (grant == QLatin1String("refresh_token") && form.queryItemValue("refresh_token") == QLatin1String("ms-refresh-1"))
+                return FakeResponse::json(QJsonObject{{"access_token", "ms-access"}, {"refresh_token", "ms-refresh-3"}});
+            return FakeResponse::json(QJsonObject{{"error", "invalid_grant"},
+                                                  {"error_description", "The provided value for the 'code' parameter is not valid."}}, 400);
+        });
+        m_net.route(kXbl, [](const FakeRequest &request) {
+            const QJsonObject props = jsonBody(request).value("Properties").toObject();
+            if (props.value("RpsTicket").toString() != QLatin1String("ms-access"))
+                return FakeResponse::error(400);
+            return FakeResponse::json(QJsonObject{{"Token", "xbl-token"}});
+        });
+        m_net.route(kXsts, [](const FakeRequest &request) {
+            const QJsonObject props = jsonBody(request).value("Properties").toObject();
+            if (props.value("UserTokens").toArray().first().toString() != QLatin1String("xbl-token"))
+                return FakeResponse::error(400);
+            const QJsonObject claims{{"xui", QJsonArray{QJsonObject{{"uhs", "user-hash"}, {"xid", "2535400000000000"}}}}};
+            return FakeResponse::json(QJsonObject{{"Token", "xsts-token"}, {"DisplayClaims", claims}});
+        });
+        m_net.route(kMcLogin, [](const FakeRequest &request) {
+            if (jsonBody(request).value("identityToken").toString() != QLatin1String("XBL3.0 x=user-hash;xsts-token"))
+                return FakeResponse::error(401);
+            return FakeResponse::json(QJsonObject{{"access_token", "mc-token"}, {"expires_in", 3600}});
+        });
+        m_net.route(kEntitlements, [](const FakeRequest &request) {
+            if (request.header("authorization") != "Bearer mc-token")
+                return FakeResponse::error(401);
+            return FakeResponse::json(QJsonObject{{"items", QJsonArray{QJsonObject{{"name", "game_minecraft"}}}}});
+        });
+        m_net.route(kProfile, [](const FakeRequest &request) {
+            if (request.header("authorization") != "Bearer mc-token")
+                return FakeResponse::error(401);
+            return FakeResponse::json(QJsonObject{{"id", "069a79f4-44e9-4726-a5be-fca90e38aaf5"}, {"name", "Notch"}});
+        });
+    }
+
+    static bool wait(Captured &c) { return QTest::qWaitFor([&] { return c.calls > 0; }, 15000); }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        m_net.reset();
+        routeHappyPath();
+    }
+
+    void fullChainWithCode()
+    {
+        MsaAuthService service;
+        QSignalSpy progress(&service, &MsaAuthService::progress);
+        Captured c;
+        const QDateTime before = QDateTime::currentDateTimeUtc();
+        service.loginWithCode("good-code", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY2(c.result.ok, qPrintable(c.result.error));
+        QCOMPARE(c.result.playerName, QStringLiteral("Notch"));
+        QCOMPARE(c.result.uuid, QStringLiteral("069a79f444e94726a5befca90e38aaf5"));
+        QCOMPARE(c.result.accessToken, QStringLiteral("mc-token"));
+        QCOMPARE(c.result.refreshToken, QStringLiteral("ms-refresh-2"));
+        QCOMPARE(c.result.xuid, QStringLiteral("2535400000000000"));
+        QCOMPARE(c.result.userType, QStringLiteral("msa"));
+        QCOMPARE(c.result.clientToken, MsaAuthService::clientId());
+        QVERIFY(!c.result.licenseMissing);
+        const qint64 lifetime = before.secsTo(c.result.expiresAt);
+        QVERIFY(lifetime > 3500 && lifetime <= 3600);
+        QVERIFY(progress.count() >= 5);
+
+        // Порядок шагов и формат запроса токена.
+        QCOMPARE(m_net.requestedUrls(), QStringList({kToken, kXbl, kXsts, kMcLogin, kEntitlements, kProfile}));
+        const FakeRequest tokenRequest = m_net.requests().constFirst();
+        QCOMPARE(tokenRequest.header("content-type"), QByteArray("application/x-www-form-urlencoded"));
+        QCOMPARE(tokenRequest.formItems().queryItemValue("client_id"), MsaAuthService::clientId());
+        QCOMPARE(jsonBody(m_net.requests().at(1)).value("RelyingParty").toString(), QStringLiteral("http://auth.xboxlive.com"));
+        QCOMPARE(jsonBody(m_net.requests().at(2)).value("RelyingParty").toString(), QStringLiteral("rp://api.minecraftservices.com/"));
+        QCOMPARE(jsonBody(m_net.requests().at(2)).value("Properties").toObject().value("SandboxId").toString(),
+                 QStringLiteral("RETAIL"));
+    }
+
+    void refreshTokenLogin()
+    {
+        MsaAuthService service;
+        Captured c;
+        service.loginWithRefreshToken("ms-refresh-1", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY2(c.result.ok, qPrintable(c.result.error));
+        QCOMPARE(c.result.refreshToken, QStringLiteral("ms-refresh-3"));   // новый refresh-токен сохраняется
+        QCOMPARE(m_net.requests().constFirst().formItems().queryItemValue("grant_type"), QStringLiteral("refresh_token"));
+    }
+
+    void emptyInputsFailImmediately()
+    {
+        MsaAuthService service;
+        Captured noCode;
+        service.loginWithCode(QString(), noCode.callback());
+        QCOMPARE(noCode.calls, 1);
+        QCOMPARE(noCode.result.error, Loc::text("auth.msa.error.noAuthCode"));
+        Captured noRefresh;
+        service.loginWithRefreshToken(QString(), noRefresh.callback());
+        QCOMPARE(noRefresh.calls, 1);
+        QCOMPARE(noRefresh.result.error, Loc::text("auth.msa.error.profileNotLinked"));
+        QVERIFY(m_net.requests().isEmpty());
+    }
+
+    void badCodeShowsMicrosoftDescription()
+    {
+        MsaAuthService service;
+        Captured c;
+        service.loginWithCode("bad-code", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(!c.result.ok);
+        QCOMPARE(c.result.error, QStringLiteral("The provided value for the 'code' parameter is not valid."));
+        QCOMPARE(m_net.requests().size(), 1);
+    }
+
+    void xstsErrors_data()
+    {
+        QTest::addColumn<double>("xerr");
+        QTest::addColumn<QString>("message");
+        QTest::addColumn<QString>("expected");
+        QTest::newRow("no xbox profile") << 2148916233.0 << "" << Loc::text("auth.msa.error.noXboxProfile");
+        QTest::newRow("country") << 2148916235.0 << "" << Loc::text("auth.msa.error.countryBlocked");
+        QTest::newRow("age 36") << 2148916236.0 << "" << Loc::text("auth.msa.error.ageVerification");
+        QTest::newRow("age 37") << 2148916237.0 << "" << Loc::text("auth.msa.error.ageVerification");
+        QTest::newRow("child") << 2148916238.0 << "" << Loc::text("auth.msa.error.childAccount");
+        QTest::newRow("unknown with message") << 1.0 << "Something odd" << "Something odd";
+        QTest::newRow("unknown without message") << 7.0 << "" << Loc::text("auth.msa.error.xboxRejected").arg(7);
+    }
+
+    void xstsErrors()
+    {
+        QFETCH(double, xerr);
+        QFETCH(QString, message);
+        QFETCH(QString, expected);
+        m_net.route(kXsts, FakeResponse::json(QJsonObject{{"XErr", xerr}, {"Message", message}}, 401));
+        MsaAuthService service;
+        Captured c;
+        service.loginWithCode("good-code", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(!c.result.ok);
+        QCOMPARE(c.result.error, expected);
+    }
+
+    void stepFailures_data()
+    {
+        QTest::addColumn<QString>("url");
+        QTest::addColumn<int>("status");
+        QTest::addColumn<QByteArray>("body");
+        QTest::addColumn<QString>("expected");
+        QTest::newRow("token without access_token") << kToken << 200 << QByteArray("{}") << Loc::text("auth.msa.error.noAccessToken");
+        QTest::newRow("xbl rejected") << kXbl << 400 << QByteArray("{}") << Loc::text("auth.msa.error.xboxTokenRejected").arg(400);
+        QTest::newRow("xbl no token") << kXbl << 200 << QByteArray("{}") << Loc::text("auth.msa.error.xboxNoToken");
+        QTest::newRow("xsts 500") << kXsts << 500 << QByteArray("{}") << Loc::text("auth.msa.error.xstsRejected").arg(500);
+        QTest::newRow("xsts no user") << kXsts << 200 << QByteArray("{\"Token\":\"t\"}") << Loc::text("auth.msa.error.xstsNoUser");
+        QTest::newRow("services rejected") << kMcLogin << 429 << QByteArray("{}") << Loc::text("auth.msa.error.servicesRejected").arg(429);
+        QTest::newRow("services no token") << kMcLogin << 200 << QByteArray("{}") << Loc::text("auth.msa.error.servicesNoToken");
+        QTest::newRow("profile 500") << kProfile << 500 << QByteArray("{}") << Loc::text("auth.msa.error.profileFetchFailed").arg(500);
+        QTest::newRow("profile empty") << kProfile << 200 << QByteArray("{}") << Loc::text("auth.msa.error.servicesNoProfile");
+    }
+
+    void stepFailures()
+    {
+        QFETCH(QString, url);
+        QFETCH(int, status);
+        QFETCH(QByteArray, body);
+        QFETCH(QString, expected);
+        m_net.route(url, FakeResponse::json(body, status));
+        MsaAuthService service;
+        Captured c;
+        service.loginWithCode("good-code", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(!c.result.ok);
+        QCOMPARE(c.result.error, expected);
+    }
+
+    void licenseChecks()
+    {
+        // Профиля нет, покупки тоже нет — нет лицензии.
+        m_net.route(kEntitlements, FakeResponse::json(QJsonObject{{"items", QJsonArray{}}}));
+        m_net.route(kProfile, FakeResponse::json("{}", 404));
+        MsaAuthService service;
+        Captured noLicense;
+        service.loginWithCode("good-code", noLicense.callback());
+        QVERIFY(wait(noLicense));
+        QVERIFY(!noLicense.result.ok);
+        QVERIFY(noLicense.result.licenseMissing);
+        QCOMPARE(noLicense.result.error, Loc::text("auth.msa.error.noLicence"));
+
+        // Покупка есть, но профиль (ник) ещё не создан.
+        m_net.route(kEntitlements, FakeResponse::json(QJsonObject{{"items", QJsonArray{QJsonObject{{"name", "x"}}}}}));
+        Captured noProfile;
+        service.loginWithCode("good-code", noProfile.callback());
+        QVERIFY(wait(noProfile));
+        QVERIFY(noProfile.result.licenseMissing);
+        QCOMPARE(noProfile.result.error, Loc::text("auth.msa.error.noProfileYet"));
+    }
+
+    void transportErrorAtMicrosoft()
+    {
+        FakeResponse drop;
+        drop.drop = true;
+        m_net.route(kToken, drop);
+        MsaAuthService service;
+        Captured c;
+        service.loginWithCode("good-code", c.callback());
+        QVERIFY(wait(c));
+        QVERIFY(c.result.error.startsWith(Loc::text("auth.msa.error.microsoftUnreachable").section(u'%', 0, 0)));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestMsaAuthService)
+#include "tst_msaauthservice.moc"
@@ -0,0 +1,197 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+#include "seasonalbuildservice.h"
+
+#include <QJsonArray>
+#include <QSignalSpy>
+
+namespace {
+const QUrl kBase(QStringLiteral("https://launcher-builds.galeonworx.com"));
+const QString kIndex = QStringLiteral("https://launcher-builds.galeonworx.com/index.json");
+}
+
+class TestSeasonalBuildService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+    }
+
+    void withoutBaseUrlFails()
+    {
+        SeasonalBuildService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 5000);
+        QVERIFY(!r.ok);
+        QCOMPARE(r.warning, Loc::text("seasonal.error.noServerUrl"));
+        QCOMPARE(service.lastError(), Loc::text("seasonal.error.noServerUrl"));
+        QVERIFY(m_net.requests().isEmpty());
+    }
+
+    void parsesValidatesAndSorts()
+    {
+        m_net.route(kIndex, FakeResponse::json(Fixtures::read("seasonal/index.json")));
+        SeasonalBuildService service;
+        service.setBaseUrl(kBase);
+        QCOMPARE(service.baseUrl(), kBase);
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY2(r.ok, qPrintable(r.warning));
+
+        QStringList ids;
+        for (const SeasonalBuildEntry &entry : service.builds())
+            ids << entry.id;
+        // Открытые сезоны первыми (новые выше), закрытые — после; всё невалидное отброшено.
+        QCOMPARE(ids, QStringList({"season-5", "vanilla-plus", "season-4"}));
+
+        const auto s5 = service.find("season-5");
+        QVERIFY(s5.has_value());
+        QVERIFY(s5->isValid());
+        QCOMPARE(s5->name, QStringLiteral("Сезон 5: Пустоши"));
+        QCOMPARE(s5->revision, 3);
+        QCOMPARE(s5->minecraftVersion, QStringLiteral("1.21.1"));
+        QCOMPARE(s5->loader, QStringLiteral("fabric"));
+        QCOMPARE(s5->loaderVersion, QStringLiteral("0.16.10"));
+        QCOMPARE(s5->javaMajor, 21);
+        QCOMPARE(s5->modCount, 120);
+        QCOMPARE(s5->description, QStringLiteral("Пустоши"));   // обрезаны пробелы
+        QCOMPARE(s5->seasonStart, QDate(2025, 7, 1));
+        QVERIFY(!s5->seasonEnd.isValid());
+        QCOMPARE(s5->archiveSize, qint64(123456));
+        QCOMPARE(s5->archiveSha256, QString("abcdef" + QString(58, u'0')));   // к нижнему регистру
+        QCOMPARE(s5->archiveUrl, QUrl("https://launcher-builds.galeonworx.com/packs/s5.zip"));
+        QCOMPARE(service.find("season-4")->seasonEnd, QDate(2025, 6, 1));
+        QVERIFY(service.find("vanilla-plus")->loader.isEmpty());
+
+        QVERIFY(QFile::exists(LauncherPaths::seasonalCatalogFile()));
+    }
+
+    void baseUrlPathIsKept()
+    {
+        m_net.route("https://launcher-builds.galeonworx.com/beta/index.json",
+                    FakeResponse::json(QJsonObject{{"formatVersion", 1}, {"builds", QJsonArray{}}}));
+        SeasonalBuildService service;
+        service.setBaseUrl(QUrl("https://launcher-builds.galeonworx.com/beta"));
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QCOMPARE(m_net.hits("https://launcher-builds.galeonworx.com/beta/index.json"), 1);
+        QVERIFY(!r.ok);
+        QCOMPARE(r.warning, Loc::text("seasonal.error.catalogEmpty"));
+    }
+
+    void formatVersionChecks_data()
+    {
+        QTest::addColumn<int>("format");
+        QTest::addColumn<QString>("error");
+        QTest::newRow("too new") << 2 << Loc::text("seasonal.error.formatTooNew").arg(2);
+        QTest::newRow("unknown") << 0 << Loc::text("seasonal.error.formatUnknown").arg(0);
+    }
+
+    void formatVersionChecks()
+    {
+        QFETCH(int, format);
+        QFETCH(QString, error);
+        QJsonObject catalog = Fixtures::readJson("seasonal/index.json");
+        catalog["formatVersion"] = format;
+        m_net.route(kIndex, FakeResponse::json(catalog));
+        SeasonalBuildService service;
+        service.setBaseUrl(kBase);
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(!r.ok);
+        QCOMPARE(r.warning, error);
+        QCOMPARE(service.lastError(), error);
+    }
+
+    void cacheIsBoundToBaseUrl()
+    {
+        m_net.route(kIndex, FakeResponse::json(Fixtures::read("seasonal/index.json")));
+        {
+            SeasonalBuildService service;
+            service.setBaseUrl(kBase);
+            CallResult r;
+            service.ensureLoaded(r.callback());
+            QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        }
+        // Тот же адрес — свежий кеш, без сети.
+        {
+            SeasonalBuildService service;
+            service.setBaseUrl(kBase);
+            CallResult r;
+            service.ensureLoaded(r.callback());
+            QVERIFY(service.hasData());
+            QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 5000);
+            QCOMPARE(m_net.hits(kIndex), 1);
+        }
+        // Другой адрес — чужой кеш не подхватывается.
+        SeasonalBuildService other;
+        other.setBaseUrl(QUrl("https://mirror.example"));
+        m_net.route("https://mirror.example/index.json", FakeResponse::error(503));
+        CallResult r;
+        other.ensureLoaded(r.callback());
+        QVERIFY(!other.hasData());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(!r.ok);
+        QVERIFY(r.warning.startsWith(Loc::text("seasonal.error.catalogFetchFailed").section(u'%', 0, 0)));
+    }
+
+    void setBaseUrlResetsData()
+    {
+        m_net.route(kIndex, FakeResponse::json(Fixtures::read("seasonal/index.json")));
+        SeasonalBuildService service;
+        service.setBaseUrl(kBase);
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(service.hasData());
+
+        QSignalSpy changed(&service, &SeasonalBuildService::buildsChanged);
+        service.setBaseUrl(kBase);   // тот же адрес — ничего не происходит
+        QCOMPARE(changed.count(), 0);
+        service.setBaseUrl(QUrl("https://mirror.example"));
+        QCOMPARE(changed.count(), 1);
+        QVERIFY(!service.hasData());
+        QVERIFY(!service.find("season-5").has_value());
+    }
+
+    void offlineWithCacheKeepsBuilds()
+    {
+        m_net.route(kIndex, FakeResponse::json(Fixtures::read("seasonal/index.json")));
+        {
+            SeasonalBuildService service;
+            service.setBaseUrl(kBase);
+            CallResult r;
+            service.ensureLoaded(r.callback());
+            QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        }
+        m_net.route(kIndex, FakeResponse::error(502));
+        SeasonalBuildService service;
+        service.setBaseUrl(kBase);
+        CallResult r;
+        service.ensureLoaded(r.callback(), /*forceRefresh=*/true);
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(r.ok);
+        QVERIFY(!r.warning.isEmpty());
+        QCOMPARE(service.builds().size(), 3);
+        QCOMPARE(service.lastError(), r.warning);
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestSeasonalBuildService)
+#include "tst_seasonalbuildservice.moc"
@@ -0,0 +1,139 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "localization.h"
+#include "seasonalpackdownloader.h"
+
+#include <QSignalSpy>
+
+namespace {
+const QString kPack = QStringLiteral("https://launcher-builds.galeonworx.com/packs/season-5-r3.zip");
+}
+
+class TestSeasonalPackDownloader : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_dir;
+
+    struct Run
+    {
+        explicit Run(SeasonalPackDownloader &d)
+            : started(&d, &SeasonalPackDownloader::started)
+            , finished(&d, &SeasonalPackDownloader::finished)
+            , failed(&d, &SeasonalPackDownloader::failed)
+            , canceled(&d, &SeasonalPackDownloader::canceled)
+        {}
+        bool waitEnd()
+        {
+            return QTest::qWaitFor([&] { return finished.count() + failed.count() + canceled.count() > 0; }, 20000);
+        }
+        QSignalSpy started, finished, failed, canceled;
+    };
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        m_net.reset();
+        m_dir = TestEnv::freshDir(QStringLiteral("packs"));
+    }
+
+    void downloadsAndVerifies()
+    {
+        const QByteArray data(300 * 1024, 'p');
+        m_net.route(kPack, FakeResponse::bytes(data));
+        SeasonalPackDownloader downloader;
+        Run run(downloader);
+        const QString target = m_dir + "/sub/season-5.zip";
+        downloader.download(QUrl(kPack), target, Fixtures::sha256(data).toUpper(), data.size(), "Season 5");
+        QVERIFY(downloader.isRunning());
+        QCOMPARE(downloader.label(), QStringLiteral("Season 5"));
+        QCOMPARE(downloader.currentFile(), QStringLiteral("season-5.zip"));
+        QCOMPARE(downloader.bytesTotal(), qint64(data.size()));
+        QCOMPARE(run.started.count(), 1);
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.finished.count(), 1);
+        QCOMPARE(run.finished.constFirst().constFirst().toString(), target);
+        QCOMPARE(Fixtures::readFile(target), data);
+        QVERIFY(!downloader.isRunning());
+        QCOMPARE(downloader.fraction(), -1.0);
+    }
+
+    void checksumMismatchLeavesNoFile()
+    {
+        m_net.route(kPack, FakeResponse::bytes("tampered"));
+        SeasonalPackDownloader downloader;
+        Run run(downloader);
+        const QString target = m_dir + "/season.zip";
+        downloader.download(QUrl(kPack), target, QString(64, u'a'), 8, "S");
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failed.count(), 1);
+        QCOMPARE(run.failed.constFirst().at(0).toString(), QStringLiteral("S"));
+        QCOMPARE(run.failed.constFirst().at(1).toString(), Loc::text("seasonal.error.checksumMismatch"));
+        QVERIFY(!QFile::exists(target));
+    }
+
+    void httpErrorAndTruncation()
+    {
+        SeasonalPackDownloader downloader;
+        {
+            m_net.route(kPack, FakeResponse::error(404));
+            Run run(downloader);
+            downloader.download(QUrl(kPack), m_dir + "/a.zip", QString(64, u'a'), 0, "A");
+            QVERIFY(run.waitEnd());
+            QVERIFY(run.failed.constFirst().at(1).toString().startsWith(
+                Loc::text("seasonal.error.downloadFailed").section(u'%', 0, 0)));
+        }
+        {
+            FakeResponse cut = FakeResponse::bytes(QByteArray(4096, 'x'));
+            cut.truncateTo = 100;
+            m_net.route(kPack, cut);
+            Run run(downloader);
+            downloader.download(QUrl(kPack), m_dir + "/b.zip", Fixtures::sha256(QByteArray(4096, 'x')), 4096, "B");
+            QVERIFY(run.waitEnd());
+            QCOMPARE(run.failed.count(), 1);
+            QVERIFY(!QFile::exists(m_dir + "/b.zip"));
+        }
+    }
+
+    void cancelInFlight()
+    {
+        FakeResponse hang;
+        hang.hang = true;
+        m_net.route(kPack, hang);
+        SeasonalPackDownloader downloader;
+        Run run(downloader);
+        downloader.download(QUrl(kPack), m_dir + "/c.zip", QString(64, u'a'), 10, "C");
+        QTRY_COMPARE_WITH_TIMEOUT(m_net.hits(kPack), 1, 15000);
+        downloader.cancel();
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.canceled.count(), 1);
+        QCOMPARE(run.canceled.constFirst().constFirst().toString(), QStringLiteral("C"));
+        QVERIFY(!QFile::exists(m_dir + "/c.zip"));
+        QVERIFY(!downloader.isRunning());
+        downloader.cancel();   // повторная отмена без загрузки — ничего не делает
+        QCOMPARE(run.canceled.count(), 1);
+    }
+
+    void secondDownloadWhileBusyIsRejected()
+    {
+        FakeResponse slow = FakeResponse::bytes("x");
+        slow.delayMs = 500;
+        m_net.route(kPack, slow);
+        SeasonalPackDownloader downloader;
+        Run run(downloader);
+        downloader.download(QUrl(kPack), m_dir + "/d.zip", Fixtures::sha256("x"), 1, "D");
+        downloader.download(QUrl(kPack), m_dir + "/e.zip", Fixtures::sha256("x"), 1, "E");
+        QCOMPARE(run.failed.count(), 1);
+        QCOMPARE(run.failed.constFirst().at(0).toString(), QStringLiteral("E"));
+        QCOMPARE(run.failed.constFirst().at(1).toString(), Loc::text("seasonal.error.downloadInProgress"));
+        QTRY_COMPARE_WITH_TIMEOUT(run.finished.count(), 1, 15000);
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestSeasonalPackDownloader)
+#include "tst_seasonalpackdownloader.moc"
@@ -0,0 +1,383 @@
+#include "testenv.h"
+#include "fakemojang.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "gamelauncher.h"
+#include "localization.h"
+#include "minecraftversion.h"
+#include "versioninstaller.h"
+#include "versionmanifestservice.h"
+
+#include <QDir>
+#include <QSignalSpy>
+
+class TestVersionInstaller : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+    QString m_game;
+
+    struct Run
+    {
+        explicit Run(VersionInstaller &installer)
+            : started(&installer, &VersionInstaller::started)
+            , finished(&installer, &VersionInstaller::finished)
+            , failed(&installer, &VersionInstaller::failed)
+            , canceled(&installer, &VersionInstaller::canceled)
+            , progress(&installer, &VersionInstaller::progressChanged)
+        {}
+        bool waitEnd(int expectedEvents = 1)
+        {
+            return QTest::qWaitFor([&] { return finished.count() + failed.count() + canceled.count() >= expectedEvents; },
+                                   30000);
+        }
+        QString failure() const { return failed.isEmpty() ? QString() : failed.constLast().at(1).toString(); }
+        QSignalSpy started, finished, failed, canceled, progress;
+    };
+
+    void verifyInstalled(const FakeMojang &mojang, const QString &id)
+    {
+        const auto expected = mojang.expectedFiles(id);
+        QVERIFY(!expected.isEmpty());
+        for (auto it = expected.cbegin(); it != expected.cend(); ++it) {
+            const QString path = m_game + u'/' + it.key();
+            QVERIFY2(QFile::exists(path), qPrintable("нет файла " + it.key()));
+            QCOMPARE(Fixtures::readFile(path), it.value());
+        }
+    }
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+    }
+
+    void installsModernVersionCompletely()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(installer.isRunning());
+        QCOMPARE(installer.versionId(), QStringLiteral("1.20.1"));
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        QCOMPARE(run.started.count(), 1);
+        QCOMPARE(run.finished.constFirst().constFirst().toString(), QStringLiteral("1.20.1"));
+        QVERIFY(!installer.isRunning());
+        QVERIFY(run.progress.count() > 0);
+        QVERIFY(m_net.unmatched().isEmpty());
+
+        verifyInstalled(mojang, "1.20.1");
+        // Результат пригоден для запуска: GameLauncher не видит недостающих файлов.
+        QString error;
+        const MinecraftVersion version = VersionLoader::load(m_game, "1.20.1", {}, &error);
+        QVERIFY2(version.isValid(), qPrintable(error));
+        LaunchOptions options;
+        options.gameDir = m_game;
+        QVERIFY(GameLauncher::missingFiles(options, version).isEmpty());
+    }
+
+    void secondInstallSkipsExistingFiles()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        {
+            Run run(installer);
+            installer.install(m_game, "1.20.1");
+            QVERIFY(run.waitEnd());
+            QVERIFY(run.failed.isEmpty());
+        }
+        const int firstRequests = m_net.requests().size();
+
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY(run.failed.isEmpty());
+        // Повторно скачивается только json версии; файлы нужного размера пропускаются.
+        const int extra = m_net.requests().size() - firstRequests;
+        QVERIFY2(extra <= 1, qPrintable(QString::number(extra)));
+    }
+
+    void legacyAssetsAreCopiedToVirtual()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.5.2", .legacyAssets = true, .javaMajor = 8});
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.5.2");
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyInstalled(mojang, "1.5.2");   // включая assets/virtual/legacy/*
+    }
+
+    void inheritedVersionPullsParentFirst()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        mojang.publish({.id = "fabric-loader-0.16.10-1.20.1", .inheritsFrom = "1.20.1"});
+
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "fabric-loader-0.16.10-1.20.1");
+        QVERIFY(run.waitEnd(2));
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        // started приходит на каждую версию, которую очередь берёт «с нуля».
+        QCOMPARE(run.started.constFirst().constFirst().toString(), QStringLiteral("fabric-loader-0.16.10-1.20.1"));
+        QStringList finishedIds;
+        for (const auto &call : run.finished)
+            finishedIds << call.constFirst().toString();
+        QCOMPARE(finishedIds, QStringList({"1.20.1", "fabric-loader-0.16.10-1.20.1"}));
+        verifyInstalled(mojang, "1.20.1");
+        verifyInstalled(mojang, "fabric-loader-0.16.10-1.20.1");
+    }
+
+    void localJsonUsedWhenNotInManifest()
+    {
+        // Версия не из манифеста (например, профиль модлоадера), но json уже лежит локально.
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "custom-1", .listed = false});
+        Fixtures::write(m_game + "/versions/custom-1/custom-1.json", mojang.versionJson("custom-1"));
+
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "custom-1");
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyInstalled(mojang, "custom-1");
+        QCOMPARE(m_net.hits(mojang.versionJsonUrl("custom-1")), 0);
+    }
+
+    void unknownVersionFails()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "9.9.9");
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("version.error.notInManifest").arg("9.9.9"));
+    }
+
+    void invalidNamesRejected_data()
+    {
+        QTest::addColumn<QString>("id");
+        QTest::newRow("traversal") << "../evil";
+        QTest::newRow("slash") << "a/b";
+        QTest::newRow("dot") << ".";
+        QTest::newRow("colon") << "c:x";
+    }
+
+    void invalidNamesRejected()
+    {
+        QFETCH(QString, id);
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, id);
+        QCOMPARE(run.failed.count(), 1);
+        QCOMPARE(run.failure(), Loc::text("version.error.invalidName").arg(id));
+        QVERIFY(m_net.requests().isEmpty());
+
+        installer.install(m_game, "   ");   // пустой id молча игнорируется
+        QCOMPARE(run.failed.count(), 1);
+    }
+
+    void versionJsonChecksumMismatch()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        m_net.route(mojang.versionJsonUrl("1.20.1"), FakeResponse::json("{\"tampered\":true}"));
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.failure(), Loc::text("version.error.descriptionChecksum").arg("1.20.1"));
+        QVERIFY(!QFile::exists(m_game + "/versions/1.20.1/1.20.1.json"));
+    }
+
+    void transientErrorIsRetried()
+    {
+        // Сбой не на последнем файле: пока ждём повтора, остальные ещё качаются.
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString lib = QStringLiteral("libraries/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar");
+        const QString jar = QStringLiteral("versions/1.20.1/1.20.1.jar");
+        FakeResponse slowJar = FakeResponse::bytes(mojang.expectedFiles("1.20.1").value(jar));
+        slowJar.delayMs = 1500;
+        mojang.overrideFile(jar, slowJar);
+        int attempts = 0;
+        m_net.route(mojang.fileUrl(lib), [&attempts](const FakeRequest &) {
+            return ++attempts == 1 ? FakeResponse::error(503) : FakeResponse::bytes("brigadier");
+        });
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        QCOMPARE(attempts, 2);
+        verifyInstalled(mojang, "1.20.1");
+    }
+
+    void retryOfLastFileIsNotLost()
+    {
+        // Сбой на последнем файле: остальные уже скачаны, повтор стоит в таймере.
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString lib = QStringLiteral("libraries/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar");
+        int attempts = 0;
+        m_net.route(mojang.fileUrl(lib), [&attempts](const FakeRequest &) {
+            if (++attempts > 1)
+                return FakeResponse::bytes("brigadier");
+            FakeResponse late = FakeResponse::error(503);
+            late.delayMs = 1000;   // все прочие файлы успевают докачаться
+            return late;
+        });
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        // retryOrFail() откладывает повтор на 400 мс, а handleReplyFinished() тут же
+        // зовёт pump(): очередь и активные загрузки пусты — установка «завершается»
+        // и падает на проверке файлов, повтор так и не происходит.
+        QEXPECT_FAIL("", "повтор последнего файла теряется: pump() завершает установку раньше таймера", Abort);
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        QCOMPARE(attempts, 2);
+    }
+
+    void checksumMismatchRetriesThenFails()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString lib = QStringLiteral("libraries/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar");
+        const QString jar = QStringLiteral("versions/1.20.1/1.20.1.jar");
+        // client.jar держим долго, чтобы все повторы библиотеки шли при живой установке.
+        FakeResponse slowJar = FakeResponse::bytes(mojang.expectedFiles("1.20.1").value(jar));
+        slowJar.delayMs = 4000;
+        mojang.overrideFile(jar, slowJar);
+        mojang.overrideFile(lib, FakeResponse::bytes("corrupted"));
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failure().startsWith(Loc::text("common.error.downloadFailed")
+                                              .arg("com.mojang:brigadier:1.1.8", Loc::text("common.error.checksumMismatch"))),
+                 qPrintable(run.failure()));
+        QCOMPARE(m_net.hits(mojang.fileUrl(lib)), 3);   // kMaxAttempts
+        QVERIFY(!QFile::exists(m_game + u'/' + lib));   // битый файл не сохранён
+    }
+
+    void permanentErrorFailsImmediately()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        const QString lib = QStringLiteral("libraries/com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar");
+        mojang.overrideFile(lib, FakeResponse::error(404));
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY(!run.failed.isEmpty());
+        QCOMPARE(m_net.hits(mojang.fileUrl(lib)), 1);
+    }
+
+    void cancelStopsDownloads()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        FakeResponse hang;
+        hang.hang = true;
+        mojang.overrideFile("versions/1.20.1/1.20.1.jar", hang);
+
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QTRY_VERIFY_WITH_TIMEOUT(m_net.hits(mojang.fileUrl("versions/1.20.1/1.20.1.jar")) == 1, 15000);
+        installer.cancel();
+        QVERIFY(run.waitEnd());
+        QCOMPARE(run.canceled.count(), 1);
+        QCOMPARE(run.canceled.constFirst().constFirst().toString(), QStringLiteral("1.20.1"));
+        QVERIFY(run.finished.isEmpty());
+        QVERIFY(!installer.isRunning());
+        QVERIFY(!QFile::exists(m_game + "/versions/1.20.1/1.20.1.jar"));
+    }
+
+    void queueRunsSequentiallyAndDeduplicates()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        mojang.publish({.id = "1.19.4", .releaseTime = "2023-03-14T12:00:00+00:00"});
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        installer.install(m_game, "1.19.4");
+        installer.install(m_game, "1.19.4");   // дубль в очереди
+        installer.install(m_game, "1.20.1");   // уже ставится
+        QVERIFY(installer.isQueued("1.19.4"));
+        QVERIFY(!installer.isQueued("1.20.1"));
+        QVERIFY(run.waitEnd(2));
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        QCOMPARE(run.finished.count(), 2);
+        QCOMPARE(run.started.count(), 2);
+        verifyInstalled(mojang, "1.19.4");
+    }
+
+    void offlineWithLocalJsonStillInstalls()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        Fixtures::write(m_game + "/versions/1.20.1/1.20.1.json", mojang.versionJson("1.20.1"));
+        m_net.route(FakeMojang::manifestUrl(), FakeResponse::error(503));
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        Run run(installer);
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY2(run.failed.isEmpty(), qPrintable(run.failure()));
+        verifyInstalled(mojang, "1.20.1");
+    }
+
+    void fractionReportsProgress()
+    {
+        FakeMojang mojang(m_net);
+        mojang.publish({.id = "1.20.1"});
+        VersionManifestService manifest;
+        VersionInstaller installer(&manifest);
+        QCOMPARE(installer.fraction(), -1.0);
+        Run run(installer);
+        double maxFraction = -1;
+        connect(&installer, &VersionInstaller::progressChanged, this, [&] {
+            maxFraction = std::max(maxFraction, installer.fraction());
+            QVERIFY(installer.fraction() <= 1.0);
+        });
+        installer.install(m_game, "1.20.1");
+        QVERIFY(run.waitEnd());
+        QVERIFY(run.failed.isEmpty());
+        QVERIFY(maxFraction > 0.0);
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestVersionInstaller)
+#include "tst_versioninstaller.moc"
@@ -0,0 +1,181 @@
+#include "testenv.h"
+#include "fixtures.h"
+#include "nettest.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+#include "versionmanifestservice.h"
+
+#include <QJsonArray>
+#include <QSignalSpy>
+
+namespace {
+const QString kManifest = QStringLiteral("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json");
+}
+
+class TestVersionManifestService : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+private slots:
+    void initTestCase() { BILAUNCHER_START_FAKE_INTERNET(m_net); }
+
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_net.reset();
+    }
+
+    void loadsSortsAndFilters()
+    {
+        m_net.route(kManifest, FakeResponse::json(Fixtures::read("mojang/version_manifest_v2.json")));
+        VersionManifestService service;
+        QSignalSpy changed(&service, &VersionManifestService::versionsChanged);
+        QSignalSpy refreshing(&service, &VersionManifestService::refreshingChanged);
+        CallResult result;
+        service.ensureLoaded(result.callback());
+        QVERIFY(service.isRefreshing());
+        QTRY_COMPARE_WITH_TIMEOUT(result.calls, 1, 15000);
+        QVERIFY(result.ok);
+        QVERIFY(result.warning.isEmpty());
+        QVERIFY(!service.isRefreshing());
+        QCOMPARE(changed.count(), 1);
+        QCOMPARE(refreshing.count(), 2);
+
+        // Новые первыми; без id и с http-ссылкой — выброшены.
+        QStringList ids;
+        for (const RemoteVersionEntry &entry : service.versions())
+            ids << entry.id;
+        QCOMPARE(ids, QStringList({"25w33a", "1.21.8", "1.20.1", "b1.7.3"}));
+
+        const auto entry = service.find("1.20.1");
+        QVERIFY(entry.has_value());
+        QCOMPARE(entry->type, QStringLiteral("release"));
+        QCOMPARE(entry->sha1, QStringLiteral("aaaa"));
+        QCOMPARE(entry->url, QUrl("https://piston-meta.mojang.com/v1/packages/aaaa/1.20.1.json"));
+        QCOMPARE(entry->releaseTime, QDateTime(QDate(2023, 6, 12), QTime(13, 25, 51), QTimeZone::UTC));
+        QVERIFY(!service.find("insecure").has_value());
+        QVERIFY(service.fetchedAt().isValid());
+
+        // Кеш на диске записан.
+        const QJsonObject cache = Fixtures::readJsonFile(LauncherPaths::versionManifestFile());
+        QCOMPARE(cache.value("versions").toArray().size(), 4);
+        QVERIFY(!cache.value("fetchedAt").toString().isEmpty());
+    }
+
+    void freshCacheAvoidsNetwork()
+    {
+        m_net.route(kManifest, FakeResponse::json(Fixtures::read("mojang/version_manifest_v2.json")));
+        {
+            VersionManifestService first;
+            CallResult r;
+            first.ensureLoaded(r.callback());
+            QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        }
+        QCOMPARE(m_net.hits(kManifest), 1);
+
+        // Новый экземпляр (как после перезапуска лаунчера) берёт свежий кеш.
+        VersionManifestService second;
+        CallResult r;
+        second.ensureLoaded(r.callback());
+        QVERIFY(second.hasData());          // данные из кеша уже доступны синхронно
+        QCOMPARE(r.calls, 0);               // колбэк — только через цикл событий
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 5000);
+        QVERIFY(r.ok);
+        QCOMPARE(m_net.hits(kManifest), 1);
+
+        // forceRefresh идёт в сеть даже при свежем кеше.
+        CallResult forced;
+        second.ensureLoaded(forced.callback(), true);
+        QTRY_COMPARE_WITH_TIMEOUT(forced.calls, 1, 15000);
+        QCOMPARE(m_net.hits(kManifest), 2);
+    }
+
+    void staleCacheIsRefreshed()
+    {
+        QJsonObject cache = Fixtures::readJson("mojang/version_manifest_v2.json");
+        cache["fetchedAt"] = QDateTime::currentDateTimeUtc().addDays(-2).toString(Qt::ISODate);
+        Fixtures::writeJson(LauncherPaths::versionManifestFile(), cache);
+
+        m_net.route(kManifest, FakeResponse::json(Fixtures::read("mojang/version_manifest_v2.json")));
+        VersionManifestService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QVERIFY(service.hasData());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QCOMPARE(m_net.hits(kManifest), 1);
+    }
+
+    void networkErrorWithoutCacheFails()
+    {
+        m_net.route(kManifest, FakeResponse::error(503));
+        VersionManifestService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(!r.ok);
+        QVERIFY(r.warning.startsWith(Loc::text("version.error.manifestFetchFailed").section(u'%', 0, 0)));
+        QVERIFY(!service.hasData());
+    }
+
+    void networkErrorWithCacheSucceedsWithWarning()
+    {
+        QJsonObject cache = Fixtures::readJson("mojang/version_manifest_v2.json");
+        cache["fetchedAt"] = QDateTime::currentDateTimeUtc().addDays(-2).toString(Qt::ISODate);
+        Fixtures::writeJson(LauncherPaths::versionManifestFile(), cache);
+        m_net.route(kManifest, FakeResponse::error(500));
+
+        VersionManifestService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(r.ok);                       // офлайн, но список есть
+        QVERIFY(!r.warning.isEmpty());
+        QCOMPARE(service.versions().size(), 4);
+    }
+
+    void garbageResponseIsRejected()
+    {
+        m_net.route(kManifest, FakeResponse::json("{\"versions\": []}"));
+        VersionManifestService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(!r.ok);
+        QCOMPARE(r.warning, Loc::text("version.error.manifestUnparsable"));
+        QVERIFY(!QFile::exists(LauncherPaths::versionManifestFile()));
+    }
+
+    void concurrentCallersShareOneRequest()
+    {
+        FakeResponse slow = FakeResponse::json(Fixtures::read("mojang/version_manifest_v2.json"));
+        slow.delayMs = 300;
+        m_net.route(kManifest, slow);
+        VersionManifestService service;
+        CallResult a, b, c;
+        service.ensureLoaded(a.callback());
+        service.ensureLoaded(b.callback());
+        service.ensureLoaded(c.callback());
+        QTRY_VERIFY_WITH_TIMEOUT(a.calls == 1 && b.calls == 1 && c.calls == 1, 15000);
+        QVERIFY(a.ok && b.ok && c.ok);
+        QCOMPARE(m_net.hits(kManifest), 1);
+    }
+
+    void corruptCacheIsIgnored()
+    {
+        Fixtures::write(LauncherPaths::versionManifestFile(), "\x00\x01garbage");
+        m_net.route(kManifest, FakeResponse::json(Fixtures::read("mojang/version_manifest_v2.json")));
+        VersionManifestService service;
+        CallResult r;
+        service.ensureLoaded(r.callback());
+        QVERIFY(!service.hasData());
+        QTRY_COMPARE_WITH_TIMEOUT(r.calls, 1, 15000);
+        QVERIFY(r.ok);
+        QVERIFY(service.hasData());
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestVersionManifestService)
+#include "tst_versionmanifestservice.moc"
@@ -0,0 +1,8 @@
+# QML: Qt Quick Test для компонентов и диалогов + дымовой тест главного окна.
+bilauncher_add_test(tst_qml LABEL qml GUI TIMEOUT 180 SOURCES tst_qml.cpp)
+target_compile_definitions(tst_qml PRIVATE QUICK_TEST_SOURCE_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
+# Сами тесты лежат рядом, в tst_*.qml; Qt Creator покажет их в проекте.
+target_sources(tst_qml PRIVATE tst_components.qml tst_dialogs.qml)
+set_source_files_properties(tst_components.qml tst_dialogs.qml PROPERTIES HEADER_FILE_ONLY TRUE)
+
+bilauncher_add_test(tst_qml_smoke LABEL qml GUI TIMEOUT 120 SOURCES tst_qml_smoke.cpp)
@@ -0,0 +1,155 @@
+import QtQuick
+import QtTest
+import BiLauncher
+
+// Маленькие переиспользуемые компоненты: DarkCombo, LabelledField,
+// ProgressPanel, LoaderRow.
+TestCase {
+    id: testCase
+    name: "Components"
+    width: 600
+    height: 400
+    visible: true
+    when: windowShown
+
+    Component { id: comboComponent; DarkCombo { width: 200; height: 32 } }
+    Component { id: fieldComponent; LabelledField { width: 220 } }
+    Component { id: panelComponent; ProgressPanel {} }
+    Component { id: loaderRowComponent; LoaderRow { width: 300 } }
+
+    // Подставной backend для LoaderRow: те же методы и сигнал, что у LauncherBackend.
+    Component {
+        id: fakeBackendComponent
+        QtObject {
+            property var versions: ({})
+            property bool loading: false
+            property var refreshCalls: []
+            signal loaderVersionsChanged(string loaderKey, string gameVersion)
+
+            function loaderVersions(key, game) { return versions[key + "/" + game] || [] }
+            function refreshLoaderVersions(key, game) { refreshCalls.push(key + "/" + game) }
+            function loaderVersionsLoading(key, game) { return loading }
+        }
+    }
+
+    // --- DarkCombo -------------------------------------------------------------
+
+    function test_comboSelectsAndDisplays() {
+        const combo = createTemporaryObject(comboComponent, testCase, { model: ["Alpha", "Beta", "Gamma"] })
+        verify(combo)
+        compare(combo.count, 3)
+        compare(combo.displayText, "Alpha")
+        const activated = signalSpy.createObject(testCase, { target: combo, signalName: "activated" })
+
+        mouseClick(combo)
+        tryVerify(() => combo.popup.opened)
+        combo.currentIndex = 2
+        compare(combo.displayText, "Gamma")
+        combo.popup.close()
+        tryVerify(() => !combo.popup.visible)
+
+        // Клавиатура: стрелки меняют выбор и шлют activated.
+        combo.forceActiveFocus()
+        keyClick(Qt.Key_Up)
+        compare(combo.currentIndex, 1)
+        compare(activated.count, 1)
+        verify(combo.indicator.source.toString().length > 0)
+    }
+
+    // --- LabelledField -------------------------------------------------------
+
+    function test_labelledFieldAliasesAndSignal() {
+        const field = createTemporaryObject(fieldComponent, testCase, { label: "Ник", placeholder: "Steve" })
+        verify(field)
+        compare(field.children[0].text, "Ник")
+        const input = field.children[1]
+        compare(input.placeholderText, "Steve")
+
+        const finished = signalSpy.createObject(testCase, { target: field, signalName: "editingFinished" })
+        input.forceActiveFocus()
+        keyClick(Qt.Key_A)
+        keyClick(Qt.Key_B)
+        compare(field.text, "ab")
+        keyClick(Qt.Key_Return)
+        compare(finished.count, 1)
+
+        field.text = "preset"
+        compare(input.text, "preset")
+    }
+
+    // --- ProgressPanel -------------------------------------------------------
+
+    function test_progressPanelPercentAndCancel() {
+        const panel = createTemporaryObject(panelComponent, testCase,
+                                            { title: "1.20.1", status: "Libraries", fraction: -1 })
+        verify(panel)
+        const texts = panel.children.filter(c => c.text !== undefined)
+        const percent = texts.find(t => t.text === "…")
+        verify(percent, "без известного итога показывается многоточие")
+
+        panel.fraction = 0.426
+        compare(percent.text, "43%")
+        panel.fraction = 1
+        compare(percent.text, "100%")
+
+        // Подпись: detail важнее status.
+        const detailText = texts.find(t => t.text === "Libraries")
+        verify(detailText)
+        panel.detail = "brigadier-1.1.8.jar"
+        compare(detailText.text, "brigadier-1.1.8.jar")
+
+        const cancel = signalSpy.createObject(testCase, { target: panel, signalName: "cancelRequested" })
+        mouseClick(panel, panel.width - 14, panel.height - 12)
+        compare(cancel.count, 1)
+
+        panel.cancellable = false
+        mouseClick(panel, panel.width - 14, panel.height - 12)
+        compare(cancel.count, 1, "крестик скрыт — отмены нет")
+    }
+
+    // --- LoaderRow -----------------------------------------------------------
+
+    function test_loaderRowFollowsBackend() {
+        const backend = createTemporaryObject(fakeBackendComponent, testCase)
+        backend.versions = {
+            "fabric/1.20.1": [ { version: "0.16.10", label: "0.16.10", recommended: false, stable: true },
+                               { version: "0.16.9", label: "0.16.9", recommended: false, stable: true } ]
+        }
+        const row = createTemporaryObject(loaderRowComponent, testCase,
+                                          { backend: backend, loaderKey: "fabric", title: "Fabric Loader" })
+        verify(row)
+        const changed = signalSpy.createObject(testCase, { target: row, signalName: "changed" })
+
+        // Без версии игры галочка недоступна, список пуст.
+        compare(row.entries.length, 0)
+        row.gameVersion = "1.20.1"
+        compare(row.entries.length, 0, "пока галочка снята — версии не запрашиваются")
+
+        // Сборка уже с Fabric: выбранная версия сохраняется, запрос обновления уходит.
+        row.applyBuild("fabric", "0.16.9")
+        verify(row.checked)
+        compare(row.selectedVersion, "0.16.9")
+        compare(row.entries.length, 2)
+        verify(backend.refreshCalls.indexOf("fabric/1.20.1") >= 0)
+        compare(changed.count, 0, "применение сохранённой сборки не считается правкой")
+
+        // Каталог обновился и выбранной версии в нём больше нет — берётся первая.
+        backend.versions = { "fabric/1.20.1": [ { version: "0.17.0", label: "0.17.0", recommended: true, stable: true } ] }
+        backend.loaderVersionsChanged("fabric", "1.20.1")
+        compare(row.selectedVersion, "0.17.0")
+        compare(changed.count, 1)
+
+        // Чужой лоадер в сборке — галочка снимается.
+        row.applyBuild("forge", "47.4.0")
+        verify(!row.checked)
+        compare(row.selectedVersion, "")
+        compare(row.entries.length, 0)
+
+        // Смена версии игры сбрасывает выбор.
+        row.applyBuild("fabric", "0.17.0")
+        row.gameVersion = "1.19.4"
+        compare(row.selectedVersion, "")
+    }
+
+    Component { id: signalSpy; SignalSpy {} }
+}
@@ -0,0 +1,119 @@
+import QtQuick
+import QtTest
+import BiLauncher
+
+// Диалоги с настоящим LauncherBackend. Данные для них подготавливает tst_qml.cpp:
+// кеш манифеста версий (1.20.1, 25w33a, b1.7.3), установленная 1.20.1,
+// кеш каталога сезонных сборок с одной сборкой. Сеть закрыта FakeInternet.
+TestCase {
+    id: testCase
+    name: "Dialogs"
+    width: 1280
+    height: 720
+    visible: true
+    when: windowShown
+
+    LauncherBackend { id: launcherBackend }
+
+    Component { id: versionPickerComponent; VersionPickerDialog { backend: launcherBackend } }
+    Component { id: javaPickerComponent; JavaPickerDialog { backend: launcherBackend } }
+    Component { id: buildsComponent; BuildsDialog { backend: launcherBackend } }
+    Component { id: seasonalComponent; SeasonalBuildsDialog { backend: launcherBackend } }
+    Component { id: signalSpy; SignalSpy {} }
+
+    function openAndWait(dialog) {
+        tryVerify(() => dialog.opened, 3000, "диалог не открылся")
+    }
+
+    function test_versionPickerFiltersCatalog() {
+        const picker = createTemporaryObject(versionPickerComponent, testCase)
+        verify(picker)
+        tryVerify(() => launcherBackend.versionCatalog.length >= 3)
+
+        picker.openFor("1.20.1")
+        openAndWait(picker)
+        compare(picker.category, "release")
+        compare(picker.visibleEntries.length, 1)
+        compare(picker.visibleEntries[0].id, "1.20.1")
+        verify(picker.visibleEntries[0].installed)
+        compare(picker.indexOfSelected(), 0)
+
+        picker.category = "snapshot"
+        compare(picker.visibleEntries.length, 1)
+        compare(picker.visibleEntries[0].id, "25w33a")
+        compare(picker.categoryOf("b1.7.3"), "old_beta")
+        compare(picker.categoryOf("no-such"), "release")
+
+        picker.category = "release"
+        picker.filterText = "1.19"
+        compare(picker.visibleEntries.length, 0)
+        picker.filterText = ""
+        picker.installedOnly = true
+        compare(picker.visibleEntries.length, 1)
+
+        const chosen = signalSpy.createObject(testCase, { target: picker, signalName: "versionChosen" })
+        picker.selectedId = "1.20.1"
+        picker.acceptSelection()
+        compare(chosen.count, 1)
+        compare(chosen.signalArguments[0][0], "1.20.1")
+        tryVerify(() => !picker.visible)
+    }
+
+    function test_javaPickerOpensWithRequirement() {
+        const picker = createTemporaryObject(javaPickerComponent, testCase)
+        verify(picker)
+        picker.openFor("", 17)
+        openAndWait(picker)
+        compare(picker.requiredMajor, 17)
+        compare(picker.category, "java")
+        compare(picker.selectedEntry, null)
+        const chosen = signalSpy.createObject(testCase, { target: picker, signalName: "runtimeChosen" })
+        picker.acceptSelection()   // ничего не выбрано — ничего не происходит
+        compare(chosen.count, 0)
+        picker.close()
+    }
+
+    function test_buildsDialogEditsBackend() {
+        const dialog = createTemporaryObject(buildsComponent, testCase)
+        verify(dialog)
+        const before = launcherBackend.customBuildNames.length
+        const name = dialog.newBuildName()
+        verify(name.length > 0)
+        verify(launcherBackend.customBuildNames.indexOf(name) === -1)
+
+        launcherBackend.addCustomBuild(name, "", "1.20.1")
+        tryVerify(() => !launcherBackend.busy, 20000)
+        compare(launcherBackend.customBuildNames.length, before + 1)
+
+        dialog.open()
+        openAndWait(dialog)
+        dialog.selectBuild(before)
+        compare(dialog.editIndex, before)
+        dialog.commit({ serverUrl: "play.example.com" })
+        compare(launcherBackend.customBuildAt(before).serverUrl, "play.example.com")
+        verify(dialog.newBuildName() !== name)
+        dialog.close()
+    }
+
+    function test_seasonalDialogShowsCatalog() {
+        const dialog = createTemporaryObject(seasonalComponent, testCase)
+        verify(dialog)
+        dialog.openCatalog()
+        openAndWait(dialog)
+        tryVerify(() => launcherBackend.seasonalCatalog.length === 1)
+        const entry = launcherBackend.seasonalCatalog[0]
+        compare(entry.id, "season-qml")
+        compare(dialog.cellText(entry, "loaderLabel"), entry.loaderTitle + " 0.16.10")
+        compare(dialog.formatMb(3 * 1024 * 1024), "3.0")
+        compare(dialog.formatMb(0), "")
+        dialog.close()
+    }
+
+    function test_languageSwitchUpdatesTexts() {
+        const en = Loc.t.app.tooltip.openMods
+        launcherBackend.updateSettings({ language: "ru" })
+        verify(Loc.t.app.tooltip.openMods !== en)
+        launcherBackend.updateSettings({ language: "en" })
+        compare(Loc.t.app.tooltip.openMods, en)
+    }
+}
@@ -0,0 +1,88 @@
+// Qt Quick Test для QML-компонентов лаунчера.
+//
+// Модуль BiLauncher у приложения вшит в исполняемый файл и плагина не имеет,
+// поэтому qmltestrunner его не импортирует. Здесь тот же модуль собран
+// статической библиотекой (bilauncher_testlib) и подключён через
+// Q_IMPORT_QML_PLUGIN — тесты пишут обычный «import BiLauncher».
+
+#include "testenv.h"
+#include "fakeinternet.h"
+#include "fixtures.h"
+
+#include "launcherpaths.h"
+
+#include <QDateTime>
+#include <QDir>
+#include <QJsonArray>
+
+#include <QQmlEngine>
+#include <QQuickStyle>
+#include <QtQml/qqmlextensionplugin.h>
+#include <QtQuickTest/quicktest.h>
+
+Q_IMPORT_QML_PLUGIN(BiLauncherPlugin)
+
+class Setup : public QObject
+{
+    Q_OBJECT
+
+public slots:
+    void applicationAvailable()
+    {
+        TestEnv::finishSetup();
+        QQuickStyle::setStyle(QStringLiteral("Basic"));
+        seedData();
+        // Диалоги создают настоящий LauncherBackend — наружу он не должен ходить.
+        QString error;
+        if (m_net.start(&error))
+            m_net.setFallback(FakeResponse::error(503));
+    }
+
+    void qmlEngineAvailable(QQmlEngine *engine)
+    {
+        engine->addImportPath(QStringLiteral("qrc:/qt/qml"));
+    }
+
+private:
+    // Данные, на которых работают диалоги (см. tst_dialogs.qml).
+    static void seedData()
+    {
+        const QString game = TestEnv::freshDir(QStringLiteral("game"));
+        const QString now = QDateTime::currentDateTimeUtc().toString(Qt::ISODate);
+        Fixtures::writeJson(LauncherPaths::settingsFile(), QJsonObject{{"gameDir", game}, {"language", "en"}});
+
+        const auto version = [](const QString &id, const QString &type, const QString &time) {
+            return QJsonObject{{"id", id}, {"type", type}, {"releaseTime", time}, {"sha1", "00"},
+                               {"url", "https://piston-meta.mojang.com/v1/packages/x/" + id + ".json"}};
+        };
+        Fixtures::writeJson(LauncherPaths::versionManifestFile(), QJsonObject{
+            {"fetchedAt", now},
+            {"versions", QJsonArray{version("25w33a", "snapshot", "2025-08-13T12:00:00Z"),
+                                    version("1.20.1", "release", "2023-06-12T13:25:51Z"),
+                                    version("b1.7.3", "old_beta", "2011-07-08T00:00:00Z")}}});
+        Fixtures::write(game + "/versions/1.20.1/1.20.1.json",
+                        "{\"id\":\"1.20.1\",\"mainClass\":\"net.minecraft.client.main.Main\"}");
+
+        const QJsonObject archive{{"url", "https://launcher-builds.galeonworx.com/packs/q.zip"},
+                                  {"size", 3 * 1024 * 1024}, {"sha256", QString(64, u'a')}};
+        const QJsonObject build{{"id", "season-qml"}, {"name", "QML Season"}, {"revision", 1},
+                                {"minecraftVersion", "1.20.1"}, {"loader", "fabric"},
+                                {"loaderVersion", "0.16.10"}, {"seasonStart", "2026-01-01"},
+                                {"archive", archive}};
+        Fixtures::writeJson(LauncherPaths::seasonalCatalogFile(), QJsonObject{
+            {"formatVersion", 1}, {"fetchedAt", now},
+            {"baseUrl", "https://launcher-builds.galeonworx.com"}, {"builds", QJsonArray{build}}});
+    }
+
+    FakeInternet m_net;
+};
+
+int main(int argc, char **argv)
+{
+    TestEnv::prepareSandbox();
+    QTEST_SET_MAIN_SOURCE_PATH
+    Setup setup;
+    return quick_test_main_with_setup(argc, argv, "bilauncher_qml", QUICK_TEST_SOURCE_DIR, &setup);
+}
+
+#include "tst_qml.moc"
@@ -0,0 +1,109 @@
+// Дымовой тест главного окна: Main.qml поднимается так же, как в main.cpp,
+// без единого предупреждения QML, и ни одного запроса в настоящую сеть.
+// Ловит то, что не видно компилятору: опечатки в именах свойств и ключах Loc.t,
+// сломанные биндинги, несуществующие картинки в ресурсах.
+
+#include "testenv.h"
+#include "fakeinternet.h"
+#include "fixtures.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickStyle>
+#include <QQuickWindow>
+#include <QtQml/qqmlextensionplugin.h>
+
+Q_IMPORT_QML_PLUGIN(BiLauncherPlugin)
+
+namespace {
+
+QStringList g_problems;
+QtMessageHandler g_previous = nullptr;
+
+void collect(QtMsgType type, const QMessageLogContext &context, const QString &message)
+{
+    // Предупреждения QML приходят с файлом qrc:/… или с категорией qt.qml.*.
+    const QString file = QString::fromUtf8(context.file ? context.file : "");
+    const QString category = QString::fromUtf8(context.category ? context.category : "");
+    const bool fromQml = file.startsWith(QLatin1String("qrc:")) || file.endsWith(QLatin1String(".qml"))
+                         || category.startsWith(QLatin1String("qt.qml"))
+                         || message.contains(QLatin1String(".qml:"));
+    if (type != QtDebugMsg && type != QtInfoMsg && fromQml)
+        g_problems << message;
+    if (g_previous)
+        g_previous(type, context, message);
+}
+
+} // namespace
+
+class TestQmlSmoke : public QObject
+{
+    Q_OBJECT
+
+    FakeInternet m_net;
+
+private slots:
+    void initTestCase()
+    {
+        QString error;
+        if (m_net.start(&error))
+            m_net.setFallback(FakeResponse::error(503));
+        const QString game = TestEnv::freshDir(QStringLiteral("game"));
+        Fixtures::writeJson(LauncherPaths::settingsFile(), QJsonObject{{"gameDir", game}, {"language", "en"}});
+        QQuickStyle::setStyle(QStringLiteral("Basic"));
+        g_previous = qInstallMessageHandler(collect);
+    }
+
+    void cleanupTestCase() { qInstallMessageHandler(g_previous); }
+
+    void init() { g_problems.clear(); }
+
+    void mainWindowLoadsCleanly()
+    {
+        // Один движок на весь тест, как в приложении: Localization держит указатель
+        // на JS-движок, создавший синглтон, и второй QQmlApplicationEngine после
+        // уничтожения первого оставил бы его висячим.
+        QQmlApplicationEngine engine;
+        QStringList warnings;
+        connect(&engine, &QQmlEngine::warnings, this, [&](const QList<QQmlError> &list) {
+            for (const QQmlError &e : list)
+                warnings << e.toString();
+        });
+        engine.loadFromModule("BiLauncher", "Main");
+        QCOMPARE(engine.rootObjects().size(), 1);
+        auto *window = qobject_cast<QQuickWindow *>(engine.rootObjects().constFirst());
+        QVERIFY(window);
+        QVERIFY(QTest::qWaitForWindowExposed(window));
+
+        // Даём отработать отложенным таймерам, загрузке каталогов и анимациям.
+        QTest::qWait(2500);
+        QVERIFY2(warnings.isEmpty(), qPrintable(warnings.join(u'\n')));
+        QVERIFY2(g_problems.isEmpty(), qPrintable(g_problems.join(u'\n')));
+
+        // Смена языка на лету перестраивает Loc.t — биндинги не должны ломаться.
+        const QString titleEn = window->title();
+        Localization::instance().setLanguage(QStringLiteral("ru"));
+        QTest::qWait(500);
+        Localization::instance().setLanguage(QStringLiteral("en"));
+        QTest::qWait(300);
+        QCOMPARE(window->title(), titleEn);
+        QVERIFY2(warnings.isEmpty(), qPrintable(warnings.join(u'\n')));
+        QVERIFY2(g_problems.isEmpty(), qPrintable(g_problems.join(u'\n')));
+
+        // Наружу — только через FakeInternet, и только на известные адреса лаунчера.
+        static const QStringList known{"mojang.com", "galeonworx.com", "adoptium.net", "fabricmc.net",
+                                       "quiltmc.org", "minecraftforge.net", "neoforged.net"};
+        for (const QString &url : m_net.requestedUrls()) {
+            const QString host = QUrl(url).host();
+            const bool ok = std::any_of(known.cbegin(), known.cend(),
+                                        [&](const QString &domain) { return host.endsWith(domain); });
+            QVERIFY2(ok, qPrintable("неожиданный запрос: " + url));
+        }
+    }
+};
+
+BILAUNCHER_GUI_TEST_MAIN(TestQmlSmoke)
+#include "tst_qml_smoke.moc"
@@ -0,0 +1,4 @@
+53
+# Число предупреждений qmllint по модулю BiLauncher, которое считается нормой.
+# tests/scripts/static_checks.py падает, если их стало больше. Исправили часть —
+# опустите число, чтобы улучшение закрепилось.
@@ -0,0 +1,69 @@
+# Дымовая проверка установленного дерева (результат cmake --install) на Windows.
+#
+#   powershell -File tests\scripts\smoke_installed.ps1 -Prefix C:\r\bl-smoke-stage
+#
+# Проверяет, что windeployqt положил всё нужное (DLL Qt, плагины платформ и QML),
+# лаунчер запускается без окна и через 10 секунд ещё жив, а в логе нет ошибок
+# загрузки модулей.
+#
+# QDir::homePath() на Windows берёт профиль у системы и USERPROFILE не читает,
+# поэтому лаунчер запускается с BILAUNCHER_HOME на временную папку (см.
+# launcherpaths.h) — настоящая %APPDATA%\BiLauncher раннера не трогается.
+
+param(
+    [Parameter(Mandatory = $true)][string]$Prefix,
+    [int]$RunSeconds = 10
+)
+
+$ErrorActionPreference = "Stop"
+function Fail($message) { Write-Host "SMOKE FAIL: $message"; exit 1 }
+
+$bin = Join-Path $Prefix "bin\BiLauncher.exe"
+if (-not (Test-Path $bin)) { Fail "нет $bin" }
+foreach ($required in @("bin\Qt6Core.dll", "bin\Qt6Quick.dll", "bin\Qt6Network.dll",
+                        "bin\platforms\qwindows.dll", "bin\qml\QtQuick\Controls")) {
+    if (-not (Test-Path (Join-Path $Prefix $required))) { Fail "нет $required" }
+}
+if (-not (Get-ChildItem (Join-Path $Prefix "bin\tls") -Filter "*.dll" -ErrorAction SilentlyContinue)) {
+    Fail "нет TLS-плагина (bin\tls) — лаунчер не сможет ходить по https"
+}
+
+$realProfile = Join-Path $env:APPDATA "BiLauncher"
+$realExisted = Test-Path $realProfile
+
+$sandbox = Join-Path $env:TEMP ("bilauncher-smoke-" + [guid]::NewGuid().ToString("N"))
+$log = Join-Path $sandbox "log"
+New-Item -ItemType Directory -Force $log | Out-Null
+$stdout = Join-Path $log "stdout.log"
+$stderr = Join-Path $log "stderr.log"
+$profileRoot = Join-Path $sandbox "AppData\Roaming\BiLauncher"
+
+$env:BILAUNCHER_HOME = $sandbox
+$env:QT_QPA_PLATFORM = "offscreen"
+$env:QT_FORCE_STDERR_LOGGING = "1"
+$env:QTWEBENGINE_CHROMIUM_FLAGS = "--disable-gpu"
+
+try {
+    $process = Start-Process -FilePath $bin -PassThru -NoNewWindow `
+        -RedirectStandardOutput $stdout -RedirectStandardError $stderr
+    Start-Sleep -Seconds $RunSeconds
+    $alive = -not $process.HasExited
+    if ($alive) { Stop-Process -Id $process.Id -Force; $process.WaitForExit(5000) | Out-Null }
+
+    $text = ""
+    if (Test-Path $stderr) { $text += Get-Content $stderr -Raw }
+    if (Test-Path $stdout) { $text += Get-Content $stdout -Raw }
+    Write-Host "----- лог запуска -----"
+    Write-Host $text
+
+    if (-not $alive) { Fail "лаунчер завершился раньше чем через $RunSeconds с (код $($process.ExitCode))" }
+    if ($text -match "is not installed|Cannot load library|could not find the Qt platform plugin|QQmlApplicationEngine failed") {
+        Fail "в логе ошибки загрузки модулей"
+    }
+    if (-not (Test-Path (Join-Path $profileRoot "settings.json"))) { Fail "лаунчер не создал $profileRoot\settings.json" }
+    if (-not $realExisted -and (Test-Path $realProfile)) { Fail "лаунчер создал настоящую $realProfile мимо BILAUNCHER_HOME" }
+    Write-Host "SMOKE OK: $bin"
+}
+finally {
+    Remove-Item -Recurse -Force $sandbox -ErrorAction SilentlyContinue
+}
@@ -0,0 +1,105 @@
+#!/usr/bin/env bash
+# Дымовая проверка установленного дерева (результат cmake --install) на Linux и macOS.
+#
+#   tests/scripts/smoke_installed.sh <prefix>
+#
+# Linux:  <prefix>/bin/BiLauncher (+ lib/BiLauncher/libz.so.1, плагины Qt рядом)
+# macOS:  <prefix>/BiLauncher.app
+#
+# Проверяет, что деплой Qt положил всё нужное: бинарник не ссылается на
+# библиотеки вне дерева (ldd/otool), запускается без окна и через 10 секунд
+# ещё жив, а в логе нет «module is not installed», «Cannot load library» и т. п.
+# Запуск идёт с подменённым HOME — настоящие данные лаунчера на машине не трогаются.
+set -euo pipefail
+
+PREFIX="$(cd "${1:?нужен путь к установленному дереву}" && pwd)"
+RUN_SECONDS="${RUN_SECONDS:-10}"
+fail() { echo "SMOKE FAIL: $*" >&2; exit 1; }
+
+case "$(uname -s)" in
+    Darwin)
+        APP="$PREFIX/BiLauncher.app"
+        BIN="$APP/Contents/MacOS/BiLauncher"
+        [ -x "$BIN" ] || fail "нет $BIN"
+        [ -f "$APP/Contents/Resources/icon.icns" ] || fail "нет иконки в бандле"
+        /usr/libexec/PlistBuddy -c 'Print :CFBundleShortVersionString' "$APP/Contents/Info.plist" >/dev/null \
+            || fail "в Info.plist нет версии"
+        # Ссылки на Qt должны вести внутрь бандла, а не в папку Qt сборочной машины.
+        if otool -L "$BIN" | tail -n +2 | grep -E '/Qt/|/Users/|/home/' ; then
+            fail "бинарник ссылается на библиотеки вне бандла"
+        fi
+        [ -d "$APP/Contents/Frameworks/QtQuick.framework" ] || fail "нет QtQuick.framework в бандле"
+        [ -d "$APP/Contents/PlugIns/platforms" ] || fail "нет плагинов платформ"
+        # Деплой идёт с -hardened-runtime: без подписи dyld откажется грузить фреймворки
+        # («different Team IDs»). Подписываем ad-hoc ровно как release.yml перед упаковкой.
+        codesign --force --deep --sign - "$APP" >/dev/null 2>&1 || fail "ad-hoc подпись не удалась"
+        codesign --verify --deep --strict "$APP" || fail "подпись бандла не проходит проверку"
+        ;;
+    Linux)
+        BIN="$PREFIX/bin/BiLauncher"
+        [ -x "$BIN" ] || fail "нет $BIN"
+        [ -f "$PREFIX/lib/BiLauncher/libz.so.1" ] || fail "нет эталонного zlib (lib/BiLauncher/libz.so.1)"
+        [ -f "$PREFIX/share/applications/bilauncher.desktop" ] || fail "нет .desktop-файла"
+        [ -f "$PREFIX/share/icons/hicolor/256x256/apps/bilauncher.png" ] || fail "нет иконки hicolor"
+        [ -f "$PREFIX/share/doc/BiLauncher/LICENSE" ] || fail "нет LICENSE в share/doc"
+        # Все разделяемые библиотеки — бинарника, Qt и плагинов — должны находиться.
+        missing=0
+        while IFS= read -r -d '' file; do
+            if ldd "$file" 2>/dev/null | grep -q 'not found'; then
+                echo "не хватает библиотек для $file:" >&2
+                ldd "$file" | grep 'not found' >&2
+                missing=1
+            fi
+        done < <(find "$PREFIX" \( -name '*.so*' -o -path '*/bin/BiLauncher' \) -type f -print0)
+        [ "$missing" = 0 ] || fail "ldd: есть ненайденные зависимости"
+        ;;
+    *) fail "неизвестная система $(uname -s)" ;;
+esac
+
+# Платформа Qt. Проверяем то, что реально задеплоено: macdeployqt кладёт только
+# cocoa — на macOS окно на 10 секунд действительно откроется (раннеру нужна
+# GUI-сессия). На Linux берём offscreen, если деплой его положил, иначе xcb
+# под xvfb-run (пакет xvfb, см. ci/setup-runner-linux.sh).
+LAUNCH=()
+PLATFORM=""
+if [ "$(uname -s)" = Linux ]; then
+    if find "$PREFIX" -name 'libqoffscreen.so' | grep -q .; then
+        PLATFORM=offscreen
+    elif command -v xvfb-run >/dev/null; then
+        LAUNCH=(xvfb-run -a)
+    elif [ -z "${DISPLAY:-}" ]; then
+        fail "нет ни плагина offscreen в деплое, ни xvfb-run, ни DISPLAY"
+    fi
+fi
+
+SANDBOX="$(mktemp -d)"
+LOG="$SANDBOX/stderr.log"
+trap 'rm -rf "$SANDBOX"' EXIT
+
+env HOME="$SANDBOX" \
+    ${PLATFORM:+QT_QPA_PLATFORM=$PLATFORM} \
+    QT_FORCE_STDERR_LOGGING=1 \
+    QTWEBENGINE_DISABLE_SANDBOX=1 \
+    QTWEBENGINE_CHROMIUM_FLAGS="--no-sandbox --disable-gpu" \
+    ${LAUNCH[@]+"${LAUNCH[@]}"} "$BIN" >"$LOG" 2>&1 &
+PID=$!
+
+sleep "$RUN_SECONDS"
+if ! kill -0 "$PID" 2>/dev/null; then
+    wait "$PID" || true
+    echo "----- лог -----" >&2; cat "$LOG" >&2
+    fail "лаунчер завершился раньше чем через ${RUN_SECONDS} с"
+fi
+kill "$PID" 2>/dev/null || true
+wait "$PID" 2>/dev/null || true
+
+echo "----- лог запуска -----"; cat "$LOG"
+if grep -E 'is not installed|Cannot load library|could not find the Qt platform plugin|QQmlApplicationEngine failed|module ".*" plugin ".*" not found|Каталог переводов' "$LOG"; then
+    fail "в логе ошибки загрузки модулей"
+fi
+
+# Лаунчер создал свою папку в подменённом HOME, а не где-то ещё.
+if [ "$(uname -s)" = Darwin ]; then ROOT="$SANDBOX/Library/Application Support/BiLauncher"; else ROOT="$SANDBOX/BiLauncher"; fi
+[ -f "$ROOT/settings.json" ] || fail "лаунчер не создал $ROOT/settings.json"
+
+echo "SMOKE OK: $BIN"
@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+"""Статические проверки без запуска лаунчера. Ненулевой код возврата при ошибке.
+
+Запуск: python3 tests/scripts/static_checks.py <папка сборки с BILAUNCHER_BUILD_TESTS=ON>
+
+1. tools/check_translations.py — каталог переводов цел и совпадает с кодом.
+2. qmllint по модулю BiLauncher (цель BiLauncher_qmllint, её создаёт qt_add_qml_module).
+   В коде уже есть предупреждения, а код ради тестов не правится, поэтому
+   проверка работает «храповиком»: падает, только если предупреждений стало
+   больше, чем записано в tests/qmllint-baseline.txt. Стало меньше — просит
+   опустить планку, чтобы достигнутое не откатилось.
+3. CHANGELOG.md содержит раздел для версии из project(BiLauncher VERSION …):
+   без него release.yml создаст релиз с пустым описанием (только предупреждение).
+"""
+import os, re, subprocess, sys
+
+ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+BASELINE = os.path.join(ROOT, "tests", "qmllint-baseline.txt")
+
+
+def step(title):
+    print(f"\n=== {title}", flush=True)
+
+
+def check_translations():
+    step("Каталог переводов")
+    return subprocess.call([sys.executable, os.path.join(ROOT, "tools", "check_translations.py")]) == 0
+
+
+def check_qmllint(build_dir):
+    step("qmllint (BiLauncher_qmllint)")
+    cmake = os.environ.get("CMAKE", "cmake")
+    proc = subprocess.run([cmake, "--build", build_dir, "--target", "BiLauncher_qmllint"],
+                          stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True,
+                          encoding="utf-8", errors="replace")
+    output = proc.stdout
+    with open(os.path.join(build_dir, "qmllint.log"), "w", encoding="utf-8") as log:
+        log.write(output)
+    warnings = [line for line in output.splitlines() if line.startswith("Warning:")]
+    errors = [line for line in output.splitlines() if line.startswith("Error:")]
+    for line in warnings + errors:
+        print(line)
+
+    baseline = int(open(BASELINE, encoding="utf-8").read().split()[0])
+    print(f"\nпредупреждений: {len(warnings)}, ошибок: {len(errors)}, планка: {baseline}"
+          f" (полный вывод — {os.path.join(build_dir, 'qmllint.log')})")
+    if proc.returncode != 0 and not warnings and not errors:
+        print("qmllint не запустился — см. лог")
+        return False
+    if errors:
+        print("ОШИБКА: qmllint нашёл ошибки")
+        return False
+    if len(warnings) > baseline:
+        print(f"ОШИБКА: предупреждений стало больше ({len(warnings)} > {baseline}). "
+              "Исправьте новые или, если они осознанные, поднимите tests/qmllint-baseline.txt.")
+        return False
+    if len(warnings) < baseline:
+        print(f"Хорошо: предупреждений меньше планки — опустите tests/qmllint-baseline.txt до {len(warnings)}.")
+    return True
+
+
+def check_changelog():
+    step("CHANGELOG.md и версия проекта")
+    cmake_text = open(os.path.join(ROOT, "CMakeLists.txt"), encoding="utf-8").read()
+    match = re.search(r"^project\(BiLauncher VERSION ([0-9]+\.[0-9]+\.[0-9]+)", cmake_text, re.M)
+    if not match:
+        print("ОШИБКА: не найден project(BiLauncher VERSION x.y.z)")
+        return False
+    version = match.group(1)
+    changelog = open(os.path.join(ROOT, "CHANGELOG.md"), encoding="utf-8").read()
+    if re.search(r"^## \[" + re.escape(version) + r"\]", changelog, re.M):
+        print(f"версия {version}: раздел в CHANGELOG.md есть")
+    else:
+        print(f"ПРЕДУПРЕЖДЕНИЕ: в CHANGELOG.md нет раздела ## [{version}] — описание релиза будет пустым")
+    return True
+
+
+def main():
+    if len(sys.argv) != 2:
+        print(__doc__)
+        return 2
+    build_dir = os.path.abspath(sys.argv[1])
+    results = [check_translations(), check_qmllint(build_dir), check_changelog()]
+    print("\nИТОГ:", "OK" if all(results) else "ЕСТЬ ОШИБКИ")
+    return 0 if all(results) else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
@@ -0,0 +1,16 @@
+# Модульные тесты: без сети, только файлы в песочнице и подставная java.
+foreach(test IN ITEMS
+        tst_launcherpaths
+        tst_javaruntime
+        tst_modloader
+        tst_localization
+        tst_minecraftversion
+        tst_authoffline
+        tst_msaredirect
+        tst_gamelauncher
+        tst_javalocator
+        tst_zlibreference
+        tst_buildarchiveworker
+        tst_buildswitcher)
+    bilauncher_add_test(${test} LABEL unit SOURCES ${test}.cpp)
+endforeach()
@@ -0,0 +1,67 @@
+#include "testenv.h"
+
+#include "authservice.h"
+#include "localization.h"
+
+#include <QCryptographicHash>
+#include <QRegularExpression>
+#include <QUuid>
+
+class TestAuthOffline : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void emptyNicknameFails()
+    {
+        const AuthResult result = AuthService::offline(QString());
+        QVERIFY(!result.ok);
+        QCOMPARE(result.error, Loc::text("auth.offline.error.noNickname"));
+    }
+
+    void uuidMatchesVanillaOfflineScheme()
+    {
+        // Так же UUID офлайн-игрока считает сервер в offline-mode:
+        // UUID v3 от MD5("OfflinePlayer:<ник>").
+        const AuthResult result = AuthService::offline(QStringLiteral("Notch"));
+        QVERIFY(result.ok);
+        QCOMPARE(result.playerName, QStringLiteral("Notch"));
+        QCOMPARE(result.uuid, QStringLiteral("b50ad385829d3141a2167e7d7539ba7f"));
+        QCOMPARE(result.accessToken, QStringLiteral("0"));
+        QCOMPARE(result.clientToken, QStringLiteral("0"));
+        QCOMPARE(result.userType, QStringLiteral("legacy"));
+    }
+
+    void uuidIsStableAndWellFormed_data()
+    {
+        QTest::addColumn<QString>("nick");
+        QTest::newRow("ascii") << "Steve";
+        QTest::newRow("digits") << "player_123";
+        QTest::newRow("cyrillic") << QStringLiteral("Игрок");
+    }
+
+    void uuidIsStableAndWellFormed()
+    {
+        QFETCH(QString, nick);
+        const AuthResult a = AuthService::offline(nick);
+        const AuthResult b = AuthService::offline(nick);
+        QCOMPARE(a.uuid, b.uuid);
+        static const QRegularExpression hex(QStringLiteral("^[0-9a-f]{32}$"));
+        QVERIFY(hex.match(a.uuid).hasMatch());
+        QCOMPARE(a.uuid.at(12), QChar(u'3'));                                   // версия 3
+        QVERIFY(QStringLiteral("89ab").contains(a.uuid.at(16)));                 // вариант RFC 4122
+        QVERIFY(AuthService::offline(nick + u'x').uuid != a.uuid);
+    }
+
+    void clientTokenIsRandomUuid()
+    {
+        const QString a = AuthService::generateClientToken();
+        const QString b = AuthService::generateClientToken();
+        QVERIFY(a != b);
+        QVERIFY(!QUuid::fromString(a).isNull());
+        QVERIFY(!a.startsWith(u'{'));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestAuthOffline)
+#include "tst_authoffline.moc"
@@ -0,0 +1,236 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "buildarchiveworker.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QSignalSpy>
+
+class TestBuildArchiveWorker : public QObject
+{
+    Q_OBJECT
+
+    QString m_game;
+    QString m_work;
+
+    void populateGame()
+    {
+        Fixtures::write(m_game + "/options.txt", "fov:90");
+        Fixtures::write(m_game + "/mods/a.jar", "mod-a");
+        Fixtures::write(m_game + "/mods/sub/b.jar", "mod-b");
+        Fixtures::write(m_game + "/config/x/y.toml", "y=1");
+        Fixtures::write(m_game + "/saves/World/level.dat", "level");      // общее — исключается
+        Fixtures::write(m_game + "/versions/1.20.1/1.20.1.json", "{}");   // общее — исключается
+    }
+
+    // Последний вызов finished(): (ok, error)
+    static QPair<bool, QString> result(const QSignalSpy &spy)
+    {
+        if (spy.isEmpty())
+            return {false, QStringLiteral("finished не пришёл")};
+        return {spy.constLast().at(0).toBool(), spy.constLast().at(1).toString()};
+    }
+
+private slots:
+    void init()
+    {
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+        m_work = TestEnv::freshDir(QStringLiteral("archives"));
+    }
+
+    void archiveClearRestoreRoundTrip()
+    {
+        populateGame();
+        const QStringList shared{"saves", "versions"};
+        const QString zip = m_work + "/build.zip";
+
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        QSignalSpy progress(&worker, &BuildArchiveWorker::progress);
+
+        worker.archive(m_game, zip, shared);
+        QCOMPARE(result(finished), qMakePair(true, QString()));
+        QCOMPARE(Fixtures::zipEntries(zip),
+                 QStringList({"config/x/y.toml", "mods/a.jar", "mods/sub/b.jar", "options.txt"}));
+        // progress: (0,total) в начале и (total,total) в конце.
+        QCOMPARE(progress.constFirst().at(0).toInt(), 0);
+        QCOMPARE(progress.constLast().at(0).toInt(), 4);
+        QCOMPARE(progress.constLast().at(1).toInt(), 4);
+
+        worker.clear(m_game, shared);
+        QCOMPARE(result(finished), qMakePair(true, QString()));
+        QCOMPARE(Fixtures::listTree(m_game),
+                 QStringList({"saves/World/level.dat", "versions/1.20.1/1.20.1.json"}));
+
+        worker.restore(zip, m_game);
+        QCOMPARE(result(finished), qMakePair(true, QString()));
+        QCOMPARE(Fixtures::listTree(m_game),
+                 QStringList({"config/x/y.toml", "mods/a.jar", "mods/sub/b.jar",
+                              "options.txt", "saves/World/level.dat", "versions/1.20.1/1.20.1.json"}));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/sub/b.jar"), QByteArray("mod-b"));
+    }
+
+    void dotFilesSurviveRoundTrip()
+    {
+        // В .minecraft живут .fabric/, .mixin.out/, на macOS ещё .DS_Store.
+        Fixtures::write(m_game + "/.fabric/remappedJars/x.jar", "cache");
+        Fixtures::write(m_game + "/mods/a.jar", "a");
+        const QString zip = m_work + "/dots.zip";
+
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.archive(m_game, zip, {});
+        QVERIFY(result(finished).first);
+        worker.clear(m_game, {});
+        worker.restore(zip, m_game);
+        QVERIFY(result(finished).first);
+        QVERIFY(QFile::exists(m_game + "/mods/a.jar"));
+
+        // QZipReader при чтении срезает ведущие «.» и «/» в именах записей, поэтому
+        // после переключения сборок .fabric/ возвращается как fabric/.
+        QEXPECT_FAIL("", "QZipReader срезает ведущую точку: .fabric/ восстанавливается как fabric/", Continue);
+        QVERIFY(QFile::exists(m_game + "/.fabric/remappedJars/x.jar"));
+    }
+
+    void archiveMissingGameDir()
+    {
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        const QString missing = m_game + "/nope";
+        worker.archive(missing, m_work + "/x.zip", {});
+        QCOMPARE(result(finished),
+                 qMakePair(false, Loc::text("switch.error.gameDirMissing").arg(QDir::toNativeSeparators(missing))));
+    }
+
+    void archiveCancelRemovesTempZip()
+    {
+        populateGame();
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.requestCancel();
+        worker.archive(m_game, m_work + "/cancel.zip", {});
+        QCOMPARE(result(finished), qMakePair(false, Loc::text("switch.status.archivingCancelled")));
+        QVERIFY(!QFile::exists(m_work + "/cancel.zip"));
+
+        worker.clearCancel();
+        worker.archive(m_game, m_work + "/ok.zip", {});
+        QVERIFY(result(finished).first);
+    }
+
+    void clearMissingDirIsOk()
+    {
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.clear(m_game + "/nope", {});
+        QVERIFY(result(finished).first);
+    }
+
+    void restoreRejectsUnreadableAndUnsafeArchives()
+    {
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+
+        const QString missing = m_work + "/missing.zip";
+        worker.restore(missing, m_game);
+        QCOMPARE(result(finished),
+                 qMakePair(false, Loc::text("switch.error.archiveOpenFailed").arg(QDir::toNativeSeparators(missing))));
+
+        // Zip-slip: запись с «..» не должна вылезти из папки игры.
+        const QString evil = m_work + "/evil.zip";
+        // Ведущие «../» QZipReader срезает сам, а «..» в середине пути — нет.
+        QVERIFY(Fixtures::makeZip(evil, {{"ok.txt", "ok"}, {"mods/../../escaped.txt", "pwned"}}));
+        QVERIFY(Fixtures::zipEntries(evil).contains("mods/../../escaped.txt"));
+        worker.restore(evil, m_game);
+        QCOMPARE(result(finished),
+                 qMakePair(false, Loc::text("switch.error.archiveBadPath").arg("mods/../../escaped.txt")));
+        QVERIFY(!QFile::exists(QFileInfo(m_game).absolutePath() + "/escaped.txt"));
+    }
+
+    void restoreCancel()
+    {
+        const QString zip = m_work + "/r.zip";
+        QVERIFY(Fixtures::makeZip(zip, {{"a.txt", "a"}}));
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.requestCancel();
+        worker.restore(zip, m_game);
+        QCOMPARE(result(finished), qMakePair(false, Loc::text("switch.status.extractCancelled")));
+    }
+
+    void applyPackRemovesThenWrites()
+    {
+        populateGame();
+        Fixtures::write(m_game + "/mods/old/legacy.jar", "old");
+        Fixtures::write(m_game + "/mods/keep.jar", "keep");
+
+        const QString pack = m_work + "/pack.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"mods/new.jar", "new"},
+                                         {"config/x/y.toml", "y=2"},
+                                         {"options.txt", "fov:70"}}));
+
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        QSignalSpy entries(&worker, &BuildArchiveWorker::packEntries);
+        worker.applyPack(pack, m_game,
+                         {"mods/old/legacy.jar", "mods/missing.jar",
+                          "../outside.txt", "versions/1.20.1/1.20.1.json"},
+                         {"versions", "saves"});
+        QCOMPARE(result(finished), qMakePair(true, QString()));
+
+        QVERIFY(!QFile::exists(m_game + "/mods/old/legacy.jar"));
+        QVERIFY(!QDir(m_game + "/mods/old").exists());   // опустевшая папка убрана
+        QVERIFY(QFile::exists(m_game + "/mods/keep.jar"));
+        // Удаление в запретной зоне молча пропускается.
+        QVERIFY(QFile::exists(m_game + "/versions/1.20.1/1.20.1.json"));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/new.jar"), QByteArray("new"));
+        QCOMPARE(Fixtures::readFile(m_game + "/config/x/y.toml"), QByteArray("y=2"));
+        QCOMPARE(Fixtures::readFile(m_game + "/options.txt"), QByteArray("fov:70"));
+
+        QCOMPARE(entries.count(), 1);
+        QStringList applied = entries.constFirst().constFirst().toStringList();
+        applied.sort();
+        QCOMPARE(applied, QStringList({"config/x/y.toml", "mods/new.jar", "options.txt"}));
+    }
+
+    void applyPackRefusesLauncherFolders()
+    {
+        populateGame();
+        const QString pack = m_work + "/bad.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"mods/new.jar", "new"}, {"versions/hack/hack.json", "{}"}}));
+
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.applyPack(pack, m_game, {"mods/a.jar"}, {"versions"});
+        QCOMPARE(result(finished),
+                 qMakePair(false, Loc::text("switch.error.packTouchesLauncher").arg("versions/hack/hack.json")));
+        // Проверка до любых изменений: ничего не удалено и не записано.
+        QVERIFY(QFile::exists(m_game + "/mods/a.jar"));
+        QVERIFY(!QFile::exists(m_game + "/mods/new.jar"));
+    }
+
+    void applyPackRefusesUnsafePaths()
+    {
+        const QString pack = m_work + "/slip.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"mods/../../../etc/x", "x"}}));
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.applyPack(pack, m_game, {}, {});
+        QCOMPARE(result(finished), qMakePair(false, Loc::text("switch.error.packBadPath").arg("mods/../../../etc/x")));
+    }
+
+    void applyPackCancel()
+    {
+        const QString pack = m_work + "/c.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"a.txt", "a"}}));
+        BuildArchiveWorker worker;
+        QSignalSpy finished(&worker, &BuildArchiveWorker::finished);
+        worker.requestCancel();
+        worker.applyPack(pack, m_game, {}, {});
+        QCOMPARE(result(finished), qMakePair(false, Loc::text("switch.status.installCancelled")));
+        QVERIFY(!QFile::exists(m_game + "/a.txt"));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestBuildArchiveWorker)
+#include "tst_buildarchiveworker.moc"
@@ -0,0 +1,302 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "buildswitcher.h"
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QJsonArray>
+#include <QSignalSpy>
+
+class TestBuildSwitcher : public QObject
+{
+    Q_OBJECT
+
+    QString m_game;
+
+    static QJsonObject index()
+    {
+        return Fixtures::readJsonFile(LauncherPaths::buildStorageDir() + "/index.json");
+    }
+
+    static QStringList zipsOf(int buildId)
+    {
+        return QDir(LauncherPaths::buildDir(buildId)).entryList({"*.zip"}, QDir::Files | QDir::Hidden);
+    }
+
+    // Ждёт finished или failed; возвращает true при finished(expectedId).
+    static bool waitDone(QSignalSpy &finished, QSignalSpy &failed, int expectedId)
+    {
+        if (!QTest::qWaitFor([&] { return finished.count() + failed.count() > 0; }, 20000)) {
+            qWarning("ни finished, ни failed за 20 с");
+            return false;
+        }
+        if (!failed.isEmpty()) {
+            qWarning("failed: %s", qPrintable(failed.constFirst().at(1).toString()));
+            return false;
+        }
+        return finished.constFirst().constFirst().toInt() == expectedId;
+    }
+
+    void writeShared()
+    {
+        Fixtures::write(m_game + "/versions/1.20.1/1.20.1.json", "{}");
+        Fixtures::write(m_game + "/libraries/x/y.jar", "lib");
+        Fixtures::write(m_game + "/assets/indexes/5.json", "{}");
+        Fixtures::write(m_game + "/launcher_profiles.json", "{}");
+    }
+
+private slots:
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+    }
+
+    void sharedTopLevelIsStable()
+    {
+        QStringList shared = BuildSwitcher::sharedTopLevel();
+        shared.sort();
+        QCOMPARE(shared, QStringList({"assets", "launcher_profiles.json", "libraries", "runtime", "versions"}));
+    }
+
+    void switchBackAndForthKeepsEachBuildContent()
+    {
+        writeShared();
+        Fixtures::write(m_game + "/mods/alpha.jar", "alpha");
+        Fixtures::write(m_game + "/saves/A/level.dat", "A");
+        Fixtures::write(m_game + "/options.txt", "alpha-options");
+
+        BuildSwitcher switcher;
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+
+        // 1 → 2: у сборки 2 архива ещё нет, папка игры очищается до общих файлов.
+        switcher.switchTo(1, QStringLiteral("Alpha build"), 2, QStringLiteral("Beta"), m_game);
+        QVERIFY(switcher.isRunning());
+        QVERIFY(waitDone(finished, failed, 2));
+        QVERIFY(!switcher.isRunning());
+        QCOMPARE(Fixtures::listTree(m_game),
+                 QStringList({"assets/indexes/5.json", "launcher_profiles.json",
+                              "libraries/x/y.jar", "versions/1.20.1/1.20.1.json"}));
+        QVERIFY(switcher.hasArchive(1));
+        QVERIFY(!switcher.hasArchive(2));
+        const QStringList zips = zipsOf(1);
+        QCOMPARE(zips.size(), 1);
+        QVERIFY(zips.constFirst().endsWith("_Alpha_build.zip"));   // имя из названия сборки
+
+        QJsonObject idx = index();
+        QCOMPARE(idx.value("state").toString(), QStringLiteral("idle"));
+        QCOMPARE(idx.value("active").toInt(), 2);
+        QCOMPARE(idx.value("builds").toObject().value("1").toObject().value("name").toString(),
+                 QStringLiteral("Alpha build"));
+
+        // Наполняем сборку 2 и возвращаемся в 1.
+        Fixtures::write(m_game + "/mods/beta.jar", "beta");
+        finished.clear();
+        switcher.switchTo(2, QStringLiteral("Beta"), 1, QStringLiteral("Alpha build"), m_game);
+        QVERIFY(waitDone(finished, failed, 1));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/alpha.jar"), QByteArray("alpha"));
+        QCOMPARE(Fixtures::readFile(m_game + "/saves/A/level.dat"), QByteArray("A"));
+        QCOMPARE(Fixtures::readFile(m_game + "/options.txt"), QByteArray("alpha-options"));
+        QVERIFY(!QFile::exists(m_game + "/mods/beta.jar"));
+        QVERIFY(QFile::exists(m_game + "/versions/1.20.1/1.20.1.json"));   // общее не тронуто
+        QVERIFY(switcher.hasArchive(2));
+
+        // И снова в 2 — его моды на месте.
+        finished.clear();
+        switcher.switchTo(1, QStringLiteral("Alpha build"), 2, QStringLiteral("Beta"), m_game);
+        QVERIFY(waitDone(finished, failed, 2));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/beta.jar"), QByteArray("beta"));
+        QVERIFY(!QFile::exists(m_game + "/mods/alpha.jar"));
+        // У сборки хранится один актуальный архив, временных не остаётся.
+        QCOMPARE(zipsOf(1).size(), 1);
+        QVERIFY(zipsOf(1).filter(".tmp-").isEmpty());
+    }
+
+    void switchWithoutSourceBuildOnlyClears()
+    {
+        writeShared();
+        Fixtures::write(m_game + "/mods/stray.jar", "x");
+        BuildSwitcher switcher;
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        switcher.switchTo(-1, QString(), 5, QStringLiteral("Five"), m_game);
+        QVERIFY(waitDone(finished, failed, 5));
+        QVERIFY(!QFile::exists(m_game + "/mods/stray.jar"));
+        QVERIFY(QFile::exists(m_game + "/libraries/x/y.jar"));
+        QVERIFY(QDir(LauncherPaths::buildStorageDir()).entryList({"*.zip"}).isEmpty());
+    }
+
+    void secondSwitchWhileBusyIsRejected()
+    {
+        writeShared();
+        for (int i = 0; i < 50; ++i)
+            Fixtures::write(m_game + QStringLiteral("/mods/m%1.jar").arg(i), QByteArray(4096, 'x'));
+        BuildSwitcher switcher;
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        switcher.switchTo(1, "A", 2, "B", m_game);
+        switcher.switchTo(1, "A", 3, "C", m_game);
+        QCOMPARE(failed.count(), 1);
+        QCOMPARE(failed.constFirst().at(0).toInt(), 3);
+        QCOMPARE(failed.constFirst().at(1).toString(), Loc::text("common.error.switchInProgress"));
+        QCOMPARE(failed.constFirst().at(2).toBool(), true);
+        QTRY_COMPARE_WITH_TIMEOUT(finished.count(), 1, 20000);
+    }
+
+    void interruptedSwitchIsReportedAndResumed()
+    {
+        writeShared();
+        Fixtures::write(m_game + "/mods/half-cleared.jar", "x");
+        // Архив сборки 7 записан, переключение 3 → 7 оборвалось посреди очистки.
+        QVERIFY(Fixtures::makeZip(LauncherPaths::buildDir(7) + "/2026-01-01_Seven.zip",
+                                  {{"mods/seven.jar", "seven"}, {"options.txt", "seven-options"}}));
+        Fixtures::writeJson(LauncherPaths::buildStorageDir() + "/index.json",
+                            QJsonObject{{"state", "switching"}, {"from", 3}, {"to", 7},
+                                        {"builds", QJsonObject{{"7", QJsonObject{{"name", "Seven"},
+                                                                                {"archive", "2026-01-01_Seven.zip"}}}}}});
+        // Мусор от прерванной архивации подметается конструктором.
+        Fixtures::write(LauncherPaths::buildDir(3) + "/.tmp-deadbeef.zip", "partial");
+
+        BuildSwitcher switcher;
+        QVERIFY(!QFile::exists(LauncherPaths::buildDir(3) + "/.tmp-deadbeef.zip"));
+        const QString warning = switcher.interruptedSwitchWarning();
+        QCOMPARE(warning, Loc::text("switch.status.switchInterrupted")
+                              .arg(Loc::text("switch.status.targetSuffix").arg("Seven")));
+
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        switcher.resumeInterrupted(m_game);
+        QVERIFY(waitDone(finished, failed, 7));
+        QVERIFY(!QFile::exists(m_game + "/mods/half-cleared.jar"));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/seven.jar"), QByteArray("seven"));
+        QCOMPARE(index().value("state").toString(), QStringLiteral("idle"));
+        QVERIFY(switcher.interruptedSwitchWarning().isEmpty());
+    }
+
+    void applyPackAndRecordNote()
+    {
+        writeShared();
+        Fixtures::write(m_game + "/mods/old.jar", "old");
+        const QString pack = LauncherPaths::buildDir(9) + "/season-pack.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"mods/new.jar", "new"}, {"config/c.toml", "c"}}));
+
+        BuildSwitcher switcher;
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        const QJsonObject note{{"seasonalId", "season-5"}, {"revision", 3}};
+        switcher.applyPack(9, QStringLiteral("Season 5"), pack, {"mods/old.jar"}, note, m_game);
+        QVERIFY(waitDone(finished, failed, 9));
+
+        QVERIFY(!QFile::exists(m_game + "/mods/old.jar"));
+        QCOMPARE(Fixtures::readFile(m_game + "/mods/new.jar"), QByteArray("new"));
+        QVERIFY(!QFile::exists(pack));   // пакет удаляется после установки
+        QStringList entries = switcher.lastPackEntries();
+        entries.sort();
+        QCOMPARE(entries, QStringList({"config/c.toml", "mods/new.jar"}));
+        QCOMPARE(switcher.lastPackNote(), note);
+        const QJsonObject idx = index();
+        QCOMPARE(idx.value("state").toString(), QStringLiteral("idle"));
+        QCOMPARE(idx.value("active").toInt(), 9);
+        QVERIFY(!idx.contains("pack"));
+    }
+
+    void applyPackErrors()
+    {
+        BuildSwitcher switcher;
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        const QString missing = LauncherPaths::buildDir(4) + "/nope.zip";
+        switcher.applyPack(4, "Four", missing, {}, {}, m_game);
+        QCOMPARE(failed.count(), 1);
+        QCOMPARE(failed.constFirst().at(1).toString(),
+                 Loc::text("switch.error.archiveMissing").arg(QDir::toNativeSeparators(missing)));
+
+        // Пакет лезет в общие папки лаунчера — отказ, папка игры цела.
+        const QString bad = LauncherPaths::buildDir(4) + "/bad.zip";
+        QVERIFY(Fixtures::makeZip(bad, {{"versions/evil/evil.json", "{}"}}));
+        failed.clear();
+        switcher.applyPack(4, "Four", bad, {}, {}, m_game);
+        QTRY_COMPARE_WITH_TIMEOUT(failed.count(), 1, 20000);
+        QCOMPARE(failed.constFirst().at(1).toString(),
+                 Loc::text("switch.error.packTouchesLauncher").arg("versions/evil/evil.json"));
+        QCOMPARE(failed.constFirst().at(2).toBool(), true);
+    }
+
+    void interruptedApplyIsResumedOrCleaned()
+    {
+        writeShared();
+        const QString pack = LauncherPaths::buildDir(11) + "/pack.zip";
+        QVERIFY(Fixtures::makeZip(pack, {{"mods/resumed.jar", "r"}}));
+        const QJsonObject note{{"k", "v"}};
+        Fixtures::writeJson(LauncherPaths::buildStorageDir() + "/index.json",
+                            QJsonObject{{"state", "applying"}, {"to", 11}, {"pack", "pack.zip"},
+                                        {"packName", "Eleven"}, {"packRemove", QJsonArray{"mods/gone.jar"}},
+                                        {"packNote", note}});
+        Fixtures::write(m_game + "/mods/gone.jar", "g");
+
+        {
+            BuildSwitcher switcher;
+            QCOMPARE(switcher.interruptedSwitchWarning(),
+                     Loc::text("switch.status.applyInterrupted")
+                         .arg(Loc::text("switch.status.nameSuffix").arg("Eleven")));
+            QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+            QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+            switcher.resumeInterrupted(m_game);
+            QVERIFY(waitDone(finished, failed, 11));
+            QVERIFY(QFile::exists(m_game + "/mods/resumed.jar"));
+            QVERIFY(!QFile::exists(m_game + "/mods/gone.jar"));
+            QCOMPARE(switcher.lastPackNote(), note);
+        }
+
+        // Пакет пропал — индекс просто приводится в порядок, без сигналов.
+        Fixtures::writeJson(LauncherPaths::buildStorageDir() + "/index.json",
+                            QJsonObject{{"state", "applying"}, {"to", 12}, {"pack", "lost.zip"}});
+        BuildSwitcher switcher;
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy failed(&switcher, &BuildSwitcher::failed);
+        switcher.resumeInterrupted(m_game);
+        QCOMPARE(index().value("state").toString(), QStringLiteral("idle"));
+        QVERIFY(!index().contains("pack"));
+        QCOMPARE(finished.count() + failed.count(), 0);
+    }
+
+    void forgetBuild()
+    {
+        QVERIFY(Fixtures::makeZip(LauncherPaths::buildDir(5) + "/a.zip", {{"x", "y"}}));
+        Fixtures::writeJson(LauncherPaths::buildStorageDir() + "/index.json",
+                            QJsonObject{{"state", "idle"}, {"active", 5},
+                                        {"builds", QJsonObject{{"5", QJsonObject{{"name", "Five"}}},
+                                                               {"6", QJsonObject{{"name", "Six"}}}}}});
+        BuildSwitcher switcher;
+        QVERIFY(switcher.hasArchive(5));
+        QVERIFY(switcher.forgetBuild(5));
+        QVERIFY(!QDir(LauncherPaths::buildDir(5)).exists());
+        QVERIFY(!switcher.hasArchive(5));
+        const QJsonObject idx = index();
+        QVERIFY(!idx.contains("active"));
+        QVERIFY(!idx.value("builds").toObject().contains("5"));
+        QVERIFY(idx.value("builds").toObject().contains("6"));
+        QVERIFY(switcher.forgetBuild(-1));
+    }
+
+    void fractionAndStage()
+    {
+        BuildSwitcher switcher;
+        QCOMPARE(switcher.fraction(), -1.0);
+        QVERIFY(switcher.stage().isEmpty());
+        writeShared();
+        Fixtures::write(m_game + "/mods/a.jar", "a");
+        QSignalSpy finished(&switcher, &BuildSwitcher::finished);
+        QSignalSpy progress(&switcher, &BuildSwitcher::progressChanged);
+        switcher.switchTo(1, "A", 2, "B", m_game);
+        QCOMPARE(switcher.stage(), Loc::text("switch.progress.saving").arg("A"));
+        QTRY_COMPARE_WITH_TIMEOUT(finished.count(), 1, 20000);
+        QVERIFY(progress.count() > 2);
+        QCOMPARE(switcher.fraction(), -1.0);
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestBuildSwitcher)
+#include "tst_buildswitcher.moc"
@@ -0,0 +1,454 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "gamelauncher.h"
+#include "javalocator.h"
+#include "localization.h"
+#include "minecraftversion.h"
+
+#include <QDir>
+#include <QSignalSpy>
+
+namespace {
+
+#if defined(Q_OS_WIN)
+const QChar kSep = u';';
+const char *kNativeName = "lwjgl.dll";
+#elif defined(Q_OS_MACOS)
+const QChar kSep = u':';
+const char *kNativeName = "liblwjgl.dylib";
+#else
+const QChar kSep = u':';
+const char *kNativeName = "liblwjgl.so";
+#endif
+
+QString nat(const QString &path)
+{
+    return QDir::toNativeSeparators(path);
+}
+
+MinecraftLibrary lib(const QString &name, const QString &path, bool native = false)
+{
+    MinecraftLibrary library;
+    library.name = name;
+    library.path = path;
+    library.native = native;
+    return library;
+}
+
+} // namespace
+
+class TestGameLauncher : public QObject
+{
+    Q_OBJECT
+
+    QString m_game;
+
+    MinecraftVersion modernVersion() const
+    {
+        MinecraftVersion v;
+        v.id = QStringLiteral("1.20.1");
+        v.mainClass = QStringLiteral("net.minecraft.client.main.Main");
+        v.type = QStringLiteral("release");
+        v.assetIndexId = QStringLiteral("5");
+        v.assetsKind = QStringLiteral("5");
+        v.clientJarPath = m_game + QStringLiteral("/versions/1.20.1/1.20.1.jar");
+        v.javaMajor = 17;
+        v.jvmArgs = QStringList{"-Djava.library.path=${natives_directory}",
+                                "-Dminecraft.launcher.brand=${launcher_name}",
+                                "-Dminecraft.launcher.version=${launcher_version}",
+                                "-Dunknown=${not_a_variable}",
+                                "-cp", "${classpath}"};
+        v.gameArgs = QStringList{"--username", "${auth_player_name}", "--version", "${version_name}",
+                                 "--gameDir", "${game_directory}", "--assetsDir", "${assets_root}",
+                                 "--assetIndex", "${assets_index_name}", "--uuid", "${auth_uuid}",
+                                 "--accessToken", "${auth_access_token}", "--clientId", "${clientid}",
+                                 "--xuid", "${auth_xuid}", "--userType", "${user_type}",
+                                 "--versionType", "${version_type}", "--mystery", "${unknown_thing}"};
+        v.libraries << lib("com.mojang:brigadier:1.1.8", "com/mojang/brigadier-1.1.8.jar")
+                    << lib("org.lwjgl:lwjgl:3.3.1", "org/lwjgl/lwjgl-3.3.1.jar")
+                    << lib("org.lwjgl:lwjgl:3.3.1:natives", "org/lwjgl/lwjgl-3.3.1-natives.jar", true);
+        return v;
+    }
+
+    LaunchOptions options() const
+    {
+        LaunchOptions o;
+        o.gameDir = m_game;
+        o.versionId = QStringLiteral("1.20.1");
+        o.playerName = QStringLiteral("Steve");
+        o.uuid = QStringLiteral("0123456789abcdef0123456789abcdef");
+        o.accessToken = QStringLiteral("secret-token");
+        o.userType = QStringLiteral("msa");
+        o.minMemoryMb = 1024;
+        o.maxMemoryMb = 6144;
+        return o;
+    }
+
+    static QString valueAfter(const QStringList &args, const QString &flag)
+    {
+        const qsizetype i = args.indexOf(flag);
+        return (i >= 0 && i + 1 < args.size()) ? args.at(i + 1) : QString();
+    }
+
+    void createGameFiles(const MinecraftVersion &v)
+    {
+        Fixtures::write(v.clientJarPath, "client");
+        Fixtures::write(m_game + "/libraries/com/mojang/brigadier-1.1.8.jar", "lib");
+        Fixtures::write(m_game + "/libraries/org/lwjgl/lwjgl-3.3.1.jar", "lib");
+        Fixtures::makeZip(m_game + "/libraries/org/lwjgl/lwjgl-3.3.1-natives.jar",
+                          {{QStringLiteral("META-INF/MANIFEST.MF"), "x"},
+                           {QStringLiteral("linux/x64/org/lwjgl/") + kNativeName, "native-bytes"},
+                           {QStringLiteral("skip/") + kNativeName + ".sha1", "hash"},
+                           // Служебные файлы LWJGL рядом с .so: не должны приниматься
+                           // за версионированную библиотеку (libfoo.so.1) ни на одной ОС.
+                           {QStringLiteral("skip/liblwjgl.so.sha1"), "hash"},
+                           {QStringLiteral("skip/liblwjgl.so.git"), "git"}});
+        Fixtures::write(m_game + "/assets/indexes/5.json", "{}");
+        QDir().mkpath(m_game + "/assets/objects");
+    }
+
+private slots:
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+    }
+
+    // --- buildArguments ---------------------------------------------------------
+
+    void substitutesVariables()
+    {
+        const MinecraftVersion v = modernVersion();
+        const QString natives = m_game + "/versions/1.20.1/natives";
+        const QStringList args = GameLauncher::buildArguments(options(), v, natives);
+
+        QCOMPARE(args.at(0), QStringLiteral("-Xms1024M"));
+        QCOMPARE(args.at(1), QStringLiteral("-Xmx6144M"));
+        QVERIFY(args.contains("-Djava.library.path=" + nat(natives)));
+        QVERIFY(args.contains("-Dminecraft.launcher.brand=BiLauncher"));
+        QVERIFY(args.contains(QStringLiteral("-Dminecraft.launcher.version=") + QStringLiteral(LAUNCHER_VERSION)));
+        // Неизвестный плейсхолдер — аргумент выбрасывается целиком.
+        QVERIFY(!args.join(' ').contains("not_a_variable"));
+        QVERIFY(!args.contains("${unknown_thing}"));
+        QVERIFY(args.contains("--mystery"));   // сам флаг остаётся, как у официального лаунчера
+
+        // classpath: обычные библиотеки, без нативов, клиентский jar последним.
+        const QStringList cp = valueAfter(args, "-cp").split(kSep);
+        QCOMPARE(cp, QStringList({nat(m_game + "/libraries/com/mojang/brigadier-1.1.8.jar"),
+                                  nat(m_game + "/libraries/org/lwjgl/lwjgl-3.3.1.jar"),
+                                  nat(v.clientJarPath)}));
+
+        // mainClass — после jvm-аргументов, перед игровыми.
+        const qsizetype main = args.indexOf(v.mainClass);
+        QVERIFY(main > args.indexOf("-cp"));
+        QVERIFY(main < args.indexOf("--username"));
+
+        QCOMPARE(valueAfter(args, "--username"), QStringLiteral("Steve"));
+        QCOMPARE(valueAfter(args, "--version"), QStringLiteral("1.20.1"));
+        QCOMPARE(valueAfter(args, "--gameDir"), nat(m_game));
+        QCOMPARE(valueAfter(args, "--assetsDir"), nat(m_game + "/assets"));
+        QCOMPARE(valueAfter(args, "--assetIndex"), QStringLiteral("5"));
+        QCOMPARE(valueAfter(args, "--uuid"), QStringLiteral("0123456789abcdef0123456789abcdef"));
+        QCOMPARE(valueAfter(args, "--accessToken"), QStringLiteral("secret-token"));
+        QCOMPARE(valueAfter(args, "--clientId"), QStringLiteral("0"));   // пустой → «0»
+        QCOMPARE(valueAfter(args, "--xuid"), QStringLiteral("0"));
+        QCOMPARE(valueAfter(args, "--userType"), QStringLiteral("msa"));
+        QCOMPARE(valueAfter(args, "--versionType"), QStringLiteral("release"));
+        QVERIFY(!args.contains("--width"));
+        QVERIFY(!args.contains("--fullscreen"));
+        QVERIFY(!args.contains("--server"));
+    }
+
+    void legacyAssetsAndSession()
+    {
+        MinecraftVersion v = modernVersion();
+        v.assetsKind = QStringLiteral("legacy");
+        v.gameArgs = QStringList{"--session", "${auth_session}", "--assetsDir", "${game_assets}"};
+        const QStringList args = GameLauncher::buildArguments(options(), v, m_game + "/n");
+        QCOMPARE(valueAfter(args, "--session"),
+                 QStringLiteral("token:secret-token:0123456789abcdef0123456789abcdef"));
+        QCOMPARE(valueAfter(args, "--assetsDir"), nat(m_game + "/assets/virtual/legacy"));
+
+        v.assetsKind = QStringLiteral("pre-1.6");
+        QCOMPARE(valueAfter(GameLauncher::buildArguments(options(), v, m_game + "/n"), "--assetsDir"),
+                 nat(m_game + "/assets/virtual/legacy"));
+        v.assetsKind = QStringLiteral("5");
+        QCOMPARE(valueAfter(GameLauncher::buildArguments(options(), v, m_game + "/n"), "--assetsDir"),
+                 nat(m_game + "/assets"));
+    }
+
+    void memoryAndExtraJvmArgs()
+    {
+        LaunchOptions o = options();
+        o.minMemoryMb = 0;
+        o.maxMemoryMb = 0;
+        o.extraJvmArgs = QStringList{"-XX:+UseG1GC", "-Dfoo=bar"};
+        const QStringList args = GameLauncher::buildArguments(o, modernVersion(), m_game + "/n");
+        QVERIFY(!args.join(' ').contains("-Xms"));
+        QVERIFY(!args.join(' ').contains("-Xmx"));
+        QCOMPARE(args.at(0), QStringLiteral("-XX:+UseG1GC"));
+        QCOMPARE(args.at(1), QStringLiteral("-Dfoo=bar"));
+    }
+
+    void authlibInjectorGoesFirst()
+    {
+        LaunchOptions o = options();
+        o.authlibInjectorPath = m_game + "/authlib-injector.jar";
+        const QStringList args = GameLauncher::buildArguments(o, modernVersion(), m_game + "/n");
+        QCOMPARE(args.at(0), "-javaagent:" + nat(o.authlibInjectorPath) + "=ely.by");
+        QCOMPARE(args.at(1), QStringLiteral("-Dauthlibinjector.side=client"));
+        QCOMPARE(args.at(2), QStringLiteral("-Xms1024M"));
+    }
+
+    void windowSizeAndFullscreen()
+    {
+        LaunchOptions o = options();
+        o.windowWidth = 1280;
+        o.windowHeight = 720;
+        o.fullscreen = true;
+        MinecraftVersion v = modernVersion();
+        QStringList args = GameLauncher::buildArguments(o, v, m_game + "/n");
+        QCOMPARE(valueAfter(args, "--width"), QStringLiteral("1280"));
+        QCOMPARE(valueAfter(args, "--height"), QStringLiteral("720"));
+        QCOMPARE(args.count("--fullscreen"), 1);
+
+        // У версии свои аргументы разрешения — лаунчер свои не дублирует.
+        v.hasCustomResolutionArgs = true;
+        v.gameArgs << "--width" << "${resolution_width}" << "--height" << "${resolution_height}";
+        args = GameLauncher::buildArguments(o, v, m_game + "/n");
+        QCOMPARE(args.count("--width"), 1);
+        QCOMPARE(valueAfter(args, "--width"), QStringLiteral("1280"));
+
+        // Только ширина — не передаём ничего.
+        o.windowHeight = 0;
+        o.fullscreen = false;
+        args = GameLauncher::buildArguments(o, modernVersion(), m_game + "/n");
+        QVERIFY(!args.contains("--width"));
+        QVERIFY(!args.contains("--fullscreen"));
+    }
+
+    void serverAutoJoin_data()
+    {
+        QTest::addColumn<bool>("quickPlay");
+        QTest::addColumn<QString>("address");
+        QTest::addColumn<QStringList>("expectedTail");
+
+        QTest::newRow("quickplay") << true << "play.example.com:25570"
+                                   << QStringList{"--quickPlayMultiplayer", "play.example.com:25570"};
+        QTest::newRow("legacy with port") << false << "play.example.com:25570"
+                                          << QStringList{"--server", "play.example.com", "--port", "25570"};
+        QTest::newRow("legacy default port") << false << "play.example.com"
+                                             << QStringList{"--server", "play.example.com", "--port", "25565"};
+    }
+
+    void serverAutoJoin()
+    {
+        QFETCH(bool, quickPlay);
+        QFETCH(QString, address);
+        QFETCH(QStringList, expectedTail);
+        LaunchOptions o = options();
+        o.serverAddress = address;
+        MinecraftVersion v = modernVersion();
+        v.supportsQuickPlay = quickPlay;
+        const QStringList args = GameLauncher::buildArguments(o, v, m_game + "/n");
+        QCOMPARE(args.mid(args.size() - expectedTail.size()), expectedTail);
+    }
+
+    void forgeIgnoreListGetsClientJar()
+    {
+        MinecraftVersion v = modernVersion();
+        v.jvmArgs.prepend("-DignoreList=bootstraplauncher,securejarhandler,${version_name}.jar");
+        QStringList args = GameLauncher::buildArguments(options(), v, m_game + "/n");
+        // ${version_name} = 1.20.1 совпадает с именем jar — дописывать нечего.
+        QCOMPARE(args.filter("-DignoreList=").constFirst(),
+                 QStringLiteral("-DignoreList=bootstraplauncher,securejarhandler,1.20.1.jar"));
+
+        // Профиль Forge со своим id, а jar родительский — имя jar дописывается.
+        v.id = QStringLiteral("1.20.1-forge-47.4.0");
+        args = GameLauncher::buildArguments(options(), v, m_game + "/n");
+        QCOMPARE(args.filter("-DignoreList=").constFirst(),
+                 QStringLiteral("-DignoreList=bootstraplauncher,securejarhandler,1.20.1-forge-47.4.0.jar,1.20.1.jar"));
+    }
+
+    void loggingArgumentOnlyWhenConfigExists()
+    {
+        MinecraftVersion v = modernVersion();
+        v.loggingArgument = QStringLiteral("-Dlog4j.configurationFile=${path}");
+        v.loggingConfigPath = m_game + "/assets/log_configs/client-1.12.xml";
+        QVERIFY(GameLauncher::buildArguments(options(), v, m_game + "/n").filter("log4j").isEmpty());
+
+        Fixtures::write(v.loggingConfigPath, "<xml/>");
+        const QStringList args = GameLauncher::buildArguments(options(), v, m_game + "/n");
+        QCOMPARE(args.filter("log4j"), QStringList{"-Dlog4j.configurationFile=" + nat(v.loggingConfigPath)});
+        QVERIFY(args.indexOf(args.filter("log4j").constFirst()) < args.indexOf(v.mainClass));
+    }
+
+    // --- missingFiles / extractNatives -------------------------------------------
+
+    void missingFiles()
+    {
+        const MinecraftVersion v = modernVersion();
+        LaunchOptions o = options();
+
+        o.gameDir = m_game + "/does-not-exist";
+        QCOMPARE(GameLauncher::missingFiles(o, v), QStringList{nat(o.gameDir)});
+
+        o = options();
+        QStringList missing = GameLauncher::missingFiles(o, v);
+        QVERIFY(missing.contains(nat(v.clientJarPath)));
+        QVERIFY(missing.contains(nat(m_game + "/libraries/com/mojang/brigadier-1.1.8.jar")));
+        QVERIFY(missing.contains(nat(m_game + "/assets/indexes/5.json")));
+        QCOMPARE(GameLauncher::missingFiles(o, v, 2).size(), 2);
+
+        createGameFiles(v);
+        QVERIFY(GameLauncher::missingFiles(o, v).isEmpty());
+
+        QDir(m_game + "/assets/objects").removeRecursively();
+        QCOMPARE(GameLauncher::missingFiles(o, v), QStringList{nat(m_game + "/assets/objects")});
+    }
+
+    void extractNatives()
+    {
+        MinecraftVersion v = modernVersion();
+        createGameFiles(v);
+        const QString natives = m_game + "/versions/1.20.1/natives";
+
+        QString error;
+        QVERIFY2(GameLauncher::extractNatives(options(), v, natives, &error), qPrintable(error));
+        // Только сама библиотека: без META-INF и без .sha1, в плоскую папку.
+        QCOMPARE(Fixtures::listTree(natives), QStringList{QString::fromLatin1(kNativeName)});
+        QCOMPARE(Fixtures::readFile(natives + u'/' + kNativeName), QByteArray("native-bytes"));
+
+        // Повторный запуск поверх готовой папки — успех.
+        QVERIFY(GameLauncher::extractNatives(options(), v, natives, &error));
+
+        // extractExclude по префиксу пути внутри архива.
+        QDir(natives).removeRecursively();
+        v.libraries[2].extractExclude = QStringList{"linux/"};
+        QVERIFY(GameLauncher::extractNatives(options(), v, natives, &error));
+        QVERIFY(Fixtures::listTree(natives).isEmpty());
+
+        // Архива нет вовсе.
+        const QString jar = m_game + "/libraries/org/lwjgl/lwjgl-3.3.1-natives.jar";
+        QFile::remove(jar);
+        error.clear();
+        QVERIFY(!GameLauncher::extractNatives(options(), v, natives, &error));
+        QCOMPARE(error, Loc::text("launch.error.nativeReadFailed").arg(nat(jar)));
+
+        // Битый архив: QZipReader::isReadable() проверяет только, что файл открылся,
+        // поэтому испорченный jar «распаковывается» в ничто без ошибки, и игра
+        // падает уже на загрузке LWJGL. Фиксируем текущее поведение.
+        Fixtures::write(jar, "not a zip");
+        error.clear();
+        QEXPECT_FAIL("", "битый jar с нативами не распознаётся как ошибка (QZipReader::isReadable)", Continue);
+        QVERIFY(!GameLauncher::extractNatives(options(), v, natives, &error));
+    }
+
+    // --- launch (с подставной java) ----------------------------------------------
+
+    void launchRunsJavaAndReportsExit()
+    {
+        MinecraftVersion v = modernVersion();
+        createGameFiles(v);
+        const QString argsFile = m_game + "/java-args.txt";
+        const QString java = Fixtures::installFakeJava(m_game + "/jdk", "17.0.8",
+                                                       {"args_file=" + argsFile, "stdout=[main] Setting user: Steve",
+                                                        "stdout=Game crashed? no", "exit=0"});
+        LaunchOptions o = options();
+        o.javaPath = java;
+
+        GameLauncher launcher;
+        QSignalSpy started(&launcher, &GameLauncher::gameStarted);
+        QSignalSpy finished(&launcher, &GameLauncher::gameFinished);
+        QSignalSpy output(&launcher, &GameLauncher::output);
+        QSignalSpy progress(&launcher, &GameLauncher::progress);
+
+        QString error;
+        QVERIFY2(launcher.launch(o, v, &error), qPrintable(error));
+        QCOMPARE(started.count(), 1);
+        // Токен скрыт в показанной строке запуска.
+        const QString shown = started.constFirst().constFirst().toString();
+        QVERIFY(!shown.contains("secret-token"));
+        QVERIFY(shown.contains("--accessToken"));
+
+        QTRY_COMPARE_WITH_TIMEOUT(finished.count(), 1, 15000);
+        QCOMPARE(finished.constFirst().at(0).toInt(), 0);
+        QCOMPARE(finished.constFirst().at(1).toBool(), false);
+        QVERIFY(!launcher.isRunning());
+        QVERIFY(progress.count() >= 3);
+
+        QStringList lines;
+        for (const QList<QVariant> &call : output)
+            lines << call.constFirst().toString();
+        QVERIFY(lines.contains("[main] Setting user: Steve"));
+
+        // Java получила те же аргументы, что строит buildArguments, и в рабочей папке игры.
+        const QStringList received = QString::fromLocal8Bit(Fixtures::readFile(argsFile)).split(u'\n', Qt::SkipEmptyParts);
+        QCOMPARE(received, GameLauncher::buildArguments(o, v, m_game + "/versions/1.20.1/natives"));
+        QVERIFY(QFile::exists(m_game + "/versions/1.20.1/natives/" + kNativeName));
+    }
+
+    void launchReportsCrash()
+    {
+        MinecraftVersion v = modernVersion();
+        createGameFiles(v);
+        LaunchOptions o = options();
+        o.javaPath = Fixtures::installFakeJava(m_game + "/jdk-crash", "17.0.8", {"crash=1"});
+
+        GameLauncher launcher;
+        QSignalSpy finished(&launcher, &GameLauncher::gameFinished);
+        QString error;
+        QVERIFY2(launcher.launch(o, v, &error), qPrintable(error));
+        QTRY_COMPARE_WITH_TIMEOUT(finished.count(), 1, 15000);
+        QCOMPARE(finished.constFirst().at(1).toBool(), true);
+    }
+
+    void launchRefusesWhileRunningAndTerminate()
+    {
+        MinecraftVersion v = modernVersion();
+        createGameFiles(v);
+        LaunchOptions o = options();
+        o.javaPath = Fixtures::installFakeJava(m_game + "/jdk-slow", "17.0.8", {"sleep_ms=30000"});
+
+        GameLauncher launcher;
+        QSignalSpy finished(&launcher, &GameLauncher::gameFinished);
+        QString error;
+        QVERIFY(launcher.launch(o, v, &error));
+        QVERIFY(launcher.isRunning());
+
+        QVERIFY(!launcher.launch(o, v, &error));
+        QCOMPARE(error, Loc::text("common.error.gameRunning"));
+
+        launcher.terminate();
+        QTRY_COMPARE_WITH_TIMEOUT(finished.count(), 1, 15000);
+        QVERIFY(!launcher.isRunning());
+    }
+
+    void launchFailsOnMissingFilesAndOldJava()
+    {
+        MinecraftVersion v = modernVersion();
+        LaunchOptions o = options();
+        GameLauncher launcher;
+        QSignalSpy started(&launcher, &GameLauncher::gameStarted);
+
+        QString error;
+        QVERIFY(!launcher.launch(o, v, &error));
+        QVERIFY(error.startsWith(Loc::text("launch.error.filesMissing").section(u'%', 0, 0)));
+
+        createGameFiles(v);
+        // На машине может стоять своя Java 17+: тогда лаунчер законно выберет её.
+        for (const QString &candidate : JavaLocator::findAll(m_game)) {
+            if (JavaLocator::majorVersion(candidate) >= 17)
+                QSKIP("в системе есть Java 17+, проверка «слишком старой Java» невозможна");
+        }
+        o.javaPath = Fixtures::installFakeJava(m_game + "/jdk8", "1.8.0_392");
+        error.clear();
+        QVERIFY(!launcher.launch(o, v, &error));
+        QCOMPARE(error, Loc::text("java.error.tooOld").arg(17).arg(8).arg(nat(o.javaPath)));
+        QCOMPARE(started.count(), 0);
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestGameLauncher)
+#include "tst_gamelauncher.moc"
@@ -0,0 +1,145 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "javalocator.h"
+#include "javaruntime.h"
+#include "localization.h"
+
+#include <QDir>
+
+class TestJavaLocator : public QObject
+{
+    Q_OBJECT
+
+    QString m_game;
+    int m_unique = 0;
+
+    // majorVersion() кеширует ответ по пути, поэтому каждая подставная java — в своей папке.
+    QString fakeJava(const QString &version)
+    {
+        return Fixtures::installFakeJava(m_game + QStringLiteral("/jdk-%1").arg(++m_unique), version);
+    }
+
+private slots:
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        m_game = TestEnv::freshDir(QStringLiteral("game"));
+    }
+
+    void majorVersion_data()
+    {
+        QTest::addColumn<QString>("version");
+        QTest::addColumn<int>("major");
+        QTest::newRow("java8") << "1.8.0_392" << 8;
+        QTest::newRow("java11") << "11.0.21" << 11;
+        QTest::newRow("java17") << "17.0.8" << 17;
+        QTest::newRow("java21 short") << "21" << 21;
+        QTest::newRow("java25 ea") << "25-ea" << 25;
+    }
+
+    void majorVersion()
+    {
+        QFETCH(QString, version);
+        QFETCH(int, major);
+        QCOMPARE(JavaLocator::majorVersion(fakeJava(version)), major);
+    }
+
+    void majorVersionOfNonJava()
+    {
+        QCOMPARE(JavaLocator::majorVersion(m_game + QStringLiteral("/nope/java")), 0);
+    }
+
+    void windowlessVariant()
+    {
+        const QString java = fakeJava("17.0.8");
+#if defined(Q_OS_WIN)
+        QCOMPARE(JavaLocator::windowlessVariant(java), QFileInfo(java).absolutePath() + "/javaw.exe");
+        QFile::remove(QFileInfo(java).absolutePath() + "/javaw.exe");
+        QCOMPARE(JavaLocator::windowlessVariant(java), java);
+#else
+        QCOMPARE(JavaLocator::windowlessVariant(java), java);
+#endif
+        QCOMPARE(JavaLocator::windowlessVariant(QStringLiteral("/opt/custom/launcher")),
+                 QStringLiteral("/opt/custom/launcher"));
+    }
+
+    void findAllSeesManagedAndGameRuntimes()
+    {
+        // Java, поставленная лаунчером (JavaRuntimeStore).
+        InstalledJavaRuntime managed;
+        managed.id = QStringLiteral("temurin-jdk-21");
+        managed.kind = QStringLiteral("jdk");
+        managed.major = 21;
+        managed.version = QStringLiteral("21.0.2");
+        managed.javaPath = Fixtures::installFakeJava(JavaRuntimeStore::dirFor(managed.id), "21.0.2");
+        QVERIFY(JavaRuntimeStore::writeMeta(managed, nullptr));
+
+        // Java официального лаунчера внутри .minecraft/runtime.
+        const QString mojang = Fixtures::installFakeJava(
+            m_game + "/runtime/java-runtime-gamma/linux/java-runtime-gamma", "17.0.8");
+
+        const QStringList all = JavaLocator::findAll(m_game);
+        QVERIFY(all.size() >= 2);
+        QCOMPARE(QFileInfo(all.at(0)).canonicalFilePath(), QFileInfo(managed.javaPath).canonicalFilePath());
+        bool hasMojang = false;
+        for (const QString &path : all)
+            hasMojang |= QFileInfo(path).canonicalFilePath() == QFileInfo(mojang).canonicalFilePath();
+        QVERIFY(hasMojang);
+        QStringList unique = all;
+        QCOMPARE(unique.removeDuplicates(), 0);
+    }
+
+    void selectPrefersPreferredWhenSuitable()
+    {
+        const QString java = fakeJava("21.0.2");
+        QString error;
+        QCOMPARE(JavaLocator::select(m_game, 17, java, &error), QFileInfo(java).absoluteFilePath());
+        QVERIFY(error.isEmpty());
+
+        // Папка JDK тоже годится: берётся bin/java.
+        const QString fromDir = JavaLocator::select(m_game, 17, QFileInfo(java).absolutePath() + "/..", &error);
+        QCOMPARE(QFileInfo(fromDir).canonicalFilePath(), QFileInfo(java).canonicalFilePath());
+    }
+
+    void selectReportsMissingPreferred()
+    {
+        QString error;
+        const QString missing = m_game + "/no-such-java";
+        QVERIFY(JavaLocator::select(m_game, 17, missing, &error).isEmpty());
+        QCOMPARE(error, Loc::text("java.error.notAtPath").arg(QDir::toNativeSeparators(missing)));
+    }
+
+    void selectFallsBackToManagedRuntime()
+    {
+        InstalledJavaRuntime managed;
+        managed.id = QStringLiteral("temurin-jdk-21b");
+        managed.kind = QStringLiteral("jdk");
+        managed.major = 21;
+        managed.version = QStringLiteral("21.0.2");
+        managed.javaPath = Fixtures::installFakeJava(JavaRuntimeStore::dirFor(managed.id), "21.0.2");
+        QVERIFY(JavaRuntimeStore::writeMeta(managed, nullptr));
+
+        const QString old = fakeJava("1.8.0_392");
+        QString error;
+        const QString chosen = JavaLocator::select(m_game, 21, old, &error);
+        QCOMPARE(QFileInfo(chosen).canonicalFilePath(), QFileInfo(managed.javaPath).canonicalFilePath());
+    }
+
+    void selectExplainsTooOld()
+    {
+        for (const QString &candidate : JavaLocator::findAll(m_game)) {
+            if (JavaLocator::majorVersion(candidate) >= 99)
+                QSKIP("в системе есть Java 99+");
+        }
+        const QString old = fakeJava("17.0.8");
+        QString error;
+        QVERIFY(JavaLocator::select(m_game, 99, old, &error).isEmpty());
+        // Сообщение называет лучшую из найденных — она не ниже нашей 17.
+        QVERIFY(!error.isEmpty());
+        QVERIFY(error.contains(QStringLiteral("99")));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestJavaLocator)
+#include "tst_javalocator.moc"
@@ -0,0 +1,233 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "javaruntime.h"
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QFile>
+
+class TestJavaRuntime : public QObject
+{
+    Q_OBJECT
+
+private:
+    static QString fakeBinary(const QString &root, const QString &relativeBinDir)
+    {
+        const QString path = root + u'/' + relativeBinDir + u'/' + Fixtures::javaExecutableName();
+        Fixtures::write(path, "#!/bin/sh\n");
+        return path;
+    }
+
+    static InstalledJavaRuntime makeRuntime(const QString &id, int major, const QString &version)
+    {
+        InstalledJavaRuntime runtime;
+        runtime.id = id;
+        runtime.kind = QStringLiteral("jdk");
+        runtime.major = major;
+        runtime.version = version;
+        runtime.size = 12345;
+        runtime.javaPath = fakeBinary(JavaRuntimeStore::dirFor(id), QStringLiteral("jdk/bin"));
+        return runtime;
+    }
+
+private slots:
+    void init() { TestEnv::resetLauncherRoot(); }
+
+    void kindKeysRoundTrip()
+    {
+        for (JavaRuntimeKind kind : {JavaRuntimeKind::Mojang, JavaRuntimeKind::Jdk, JavaRuntimeKind::Jre}) {
+            const auto back = javaKindFromKey(javaKindKey(kind));
+            QVERIFY(back.has_value());
+            QCOMPARE(*back, kind);
+            QVERIFY(!javaKindTitle(kind).isEmpty());
+        }
+        QCOMPARE(javaKindKey(JavaRuntimeKind::Mojang), QStringLiteral("java"));
+        QVERIFY(!javaKindFromKey(QStringLiteral("graalvm")).has_value());
+        QVERIFY(!javaKindFromKey(QString()).has_value());
+    }
+
+    void entryValidity()
+    {
+        JavaRuntimeEntry entry;
+        QVERIFY(!entry.isValid());
+        entry.id = QStringLiteral("temurin-jdk-21");
+        entry.major = 21;
+        QVERIFY(!entry.isValid());
+        entry.url = QUrl(QStringLiteral("https://example.org/jdk.zip"));
+        QVERIFY(entry.isValid());
+    }
+
+    void sanitizeId_data()
+    {
+        QTest::addColumn<QString>("input");
+        QTest::addColumn<QString>("expected");
+        QTest::newRow("plain") << "temurin-jdk-21.0.2_13" << "temurin-jdk-21.0.2_13";
+        QTest::newRow("plus") << "jdk-21.0.2+13" << "jdk-21.0.2_13";
+        QTest::newRow("slashes") << "../../etc/passwd" << "_.._etc_passwd";
+        QTest::newRow("backslash") << "a\\b" << "a_b";
+        QTest::newRow("leadingDots") << "...hidden" << "hidden";
+        QTest::newRow("onlyDots") << ".." << "";
+        QTest::newRow("empty") << "" << "";
+    }
+
+    void sanitizeId()
+    {
+        QFETCH(QString, input);
+        QFETCH(QString, expected);
+        QCOMPARE(JavaRuntimeStore::sanitizeId(input), expected);
+    }
+
+    void dirForStaysInsideJavaDir()
+    {
+        QCOMPARE(JavaRuntimeStore::dirFor(QStringLiteral("jdk-17")),
+                 LauncherPaths::javaDir() + QStringLiteral("/jdk-17"));
+        QVERIFY(JavaRuntimeStore::dirFor(QStringLiteral("..")).isEmpty());
+        QVERIFY(JavaRuntimeStore::dirFor(QStringLiteral("../x")).startsWith(LauncherPaths::javaDir() + u'/'));
+    }
+
+    void locateBinaryPrefersShortestBinPath()
+    {
+        const QString root = TestEnv::freshDir(QStringLiteral("locate"));
+        QVERIFY(JavaRuntimeStore::locateBinary(root).isEmpty());
+        QVERIFY(JavaRuntimeStore::locateBinary(root + QStringLiteral("/missing")).isEmpty());
+        QVERIFY(JavaRuntimeStore::locateBinary(QString()).isEmpty());
+
+        // java вне папки bin не считается
+        Fixtures::write(root + u'/' + Fixtures::javaExecutableName(), "x");
+        QVERIFY(JavaRuntimeStore::locateBinary(root).isEmpty());
+
+        const QString deep = fakeBinary(root, QStringLiteral("jdk-21/lib/legal/jre/bin"));
+        QCOMPARE(JavaRuntimeStore::locateBinary(root), deep);
+        const QString macLayout = fakeBinary(root, QStringLiteral("jdk-21/Contents/Home/bin"));
+        QCOMPARE(JavaRuntimeStore::locateBinary(root), macLayout);
+        const QString flat = fakeBinary(root, QStringLiteral("jdk-21/bin"));
+        QCOMPARE(JavaRuntimeStore::locateBinary(root), flat);
+    }
+
+    void writeMetaFindInstalledRemove()
+    {
+        QString error;
+        const InstalledJavaRuntime older = makeRuntime(QStringLiteral("temurin-jdk-17.0.9"), 17, QStringLiteral("17.0.9"));
+        const InstalledJavaRuntime newer = makeRuntime(QStringLiteral("temurin-jdk-21.0.2"), 21, QStringLiteral("21.0.2"));
+        const InstalledJavaRuntime newerPatch = makeRuntime(QStringLiteral("temurin-jdk-21.0.5"), 21, QStringLiteral("21.0.5"));
+        QVERIFY2(JavaRuntimeStore::writeMeta(older, &error), qPrintable(error));
+        QVERIFY2(JavaRuntimeStore::writeMeta(newer, &error), qPrintable(error));
+        QVERIFY2(JavaRuntimeStore::writeMeta(newerPatch, &error), qPrintable(error));
+
+        // Путь хранится относительным: папку можно переносить.
+        const QJsonObject meta = Fixtures::readJsonFile(JavaRuntimeStore::dirFor(newer.id) + "/runtime.json");
+        QCOMPARE(meta.value("javaPath").toString(), "jdk/bin/" + Fixtures::javaExecutableName());
+
+        const auto found = JavaRuntimeStore::find(newer.id);
+        QVERIFY(found.has_value());
+        QCOMPARE(found->major, 21);
+        QCOMPARE(found->version, QStringLiteral("21.0.2"));
+        QCOMPARE(found->kind, QStringLiteral("jdk"));
+        QCOMPARE(found->size, qint64(12345));
+        QCOMPARE(QFileInfo(found->javaPath).canonicalFilePath(), QFileInfo(newer.javaPath).canonicalFilePath());
+
+        // Сортировка: свежая major первой, внутри — по версии по убыванию.
+        const QList<InstalledJavaRuntime> all = JavaRuntimeStore::installed();
+        QCOMPARE(all.size(), 3);
+        QCOMPARE(all.at(0).id, newerPatch.id);
+        QCOMPARE(all.at(1).id, newer.id);
+        QCOMPARE(all.at(2).id, older.id);
+
+        QVERIFY(JavaRuntimeStore::remove(older.id, &error));
+        QVERIFY(!QDir(JavaRuntimeStore::dirFor(older.id)).exists());
+        QVERIFY(!JavaRuntimeStore::find(older.id).has_value());
+        // Удаление несуществующего — не ошибка.
+        QVERIFY(JavaRuntimeStore::remove(older.id, &error));
+        QCOMPARE(JavaRuntimeStore::installed().size(), 2);
+    }
+
+    void findRejectsBrokenMeta()
+    {
+        const InstalledJavaRuntime runtime = makeRuntime(QStringLiteral("jdk-x"), 21, QStringLiteral("21"));
+        QVERIFY(JavaRuntimeStore::writeMeta(runtime, nullptr));
+        QVERIFY(JavaRuntimeStore::find(runtime.id).has_value());
+
+        // Бинарник пропал — запись больше не считается установленной.
+        QFile::remove(runtime.javaPath);
+        QVERIFY(!JavaRuntimeStore::find(runtime.id).has_value());
+
+        // id в файле не совпадает с папкой.
+        const InstalledJavaRuntime other = makeRuntime(QStringLiteral("jdk-y"), 17, QStringLiteral("17"));
+        QVERIFY(JavaRuntimeStore::writeMeta(other, nullptr));
+        QJsonObject meta = Fixtures::readJsonFile(JavaRuntimeStore::dirFor(other.id) + "/runtime.json");
+        meta["id"] = "jdk-z";
+        Fixtures::writeJson(JavaRuntimeStore::dirFor(other.id) + "/runtime.json", meta);
+        QVERIFY(!JavaRuntimeStore::find(other.id).has_value());
+
+        // Мусор вместо json.
+        Fixtures::write(JavaRuntimeStore::dirFor(other.id) + "/runtime.json", "{not json");
+        QVERIFY(!JavaRuntimeStore::find(other.id).has_value());
+        QVERIFY(JavaRuntimeStore::installed().isEmpty());
+    }
+
+    void invalidIdsAreRejected()
+    {
+        QString error;
+        InstalledJavaRuntime runtime;
+        runtime.id = QStringLiteral("..");
+        QVERIFY(!JavaRuntimeStore::writeMeta(runtime, &error));
+        QCOMPARE(error, Loc::text("java.error.invalidRuntimeId"));
+        error.clear();
+        QVERIFY(!JavaRuntimeStore::remove(QStringLiteral(".."), &error));
+        QCOMPARE(error, Loc::text("java.error.invalidRuntimeId"));
+        QVERIFY(!JavaRuntimeStore::find(QString()).has_value());
+    }
+
+    void minimumJavaFor_data()
+    {
+        QTest::addColumn<QString>("version");
+        QTest::addColumn<int>("java");
+        QTest::newRow("empty") << "" << 0;
+        QTest::newRow("spaces") << "   " << 0;
+        QTest::newRow("1.7.10") << "1.7.10" << 8;
+        QTest::newRow("1.12.2") << "1.12.2" << 8;
+        QTest::newRow("1.16.5") << "1.16.5" << 8;
+        QTest::newRow("1.17") << "1.17" << 16;
+        QTest::newRow("1.17.1") << "1.17.1" << 16;
+        QTest::newRow("1.18") << "1.18" << 17;
+        QTest::newRow("1.19.4") << "1.19.4" << 17;
+        QTest::newRow("1.20.1") << "1.20.1" << 17;
+        QTest::newRow("1.20.4") << "1.20.4" << 17;
+        QTest::newRow("1.20.5") << "1.20.5" << 21;
+        QTest::newRow("1.20.6") << "1.20.6" << 21;
+        QTest::newRow("1.21") << "1.21" << 21;
+        QTest::newRow("1.21.8") << "1.21.8" << 21;
+        QTest::newRow("forge-suffix") << "1.20.1-forge-47.4.0" << 17;
+        QTest::newRow("newEpoch") << "26.1" << 21;
+        QTest::newRow("snapshot20") << "20w45a" << 8;
+        QTest::newRow("snapshot21") << "21w19a" << 16;
+        QTest::newRow("snapshot22") << "22w45a" << 17;
+        QTest::newRow("snapshot24") << "24w14a" << 21;
+        QTest::newRow("snapshot25") << "25w33a" << 21;
+        QTest::newRow("beta") << "b1.7.3" << 8;
+        QTest::newRow("trimmed") << " 1.18.2 " << 17;
+    }
+
+    void minimumJavaFor()
+    {
+        QFETCH(QString, version);
+        QFETCH(int, java);
+        QCOMPARE(JavaRequirement::minimumFor(version), java);
+    }
+
+    void coverage()
+    {
+        QCOMPARE(JavaRequirement::coverage(25), Loc::text("java.range.modern"));
+        QCOMPARE(JavaRequirement::coverage(21), Loc::text("java.range.modern"));
+        QCOMPARE(JavaRequirement::coverage(17), Loc::text("java.range.mid"));
+        QCOMPARE(JavaRequirement::coverage(16), Loc::text("java.range.seventeen"));
+        QCOMPARE(JavaRequirement::coverage(11), Loc::text("java.range.unsuitable"));
+        QCOMPARE(JavaRequirement::coverage(8), Loc::text("java.range.legacy"));
+        QVERIFY(JavaRequirement::coverage(0).isEmpty());
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestJavaRuntime)
+#include "tst_javaruntime.moc"
@@ -0,0 +1,119 @@
+#include "testenv.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QDir>
+#include <QFile>
+#include <QFileInfo>
+#include <QScopeGuard>
+
+class TestLauncherPaths : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void init() { TestEnv::resetLauncherRoot(); }
+
+    void rootIsInsideContainer()
+    {
+        QVERIFY(LauncherPaths::rootDir().startsWith(LauncherPaths::containerDir() + u'/'));
+        QCOMPARE(QFileInfo(LauncherPaths::rootDir()).fileName(), QStringLiteral("BiLauncher"));
+    }
+
+    void containerPerPlatform()
+    {
+        // Не QDir::homePath(): на Windows он смотрит в настоящий профиль, а пути
+        // лаунчера в тестах идут от BILAUNCHER_HOME (песочницы).
+        const QString home = QDir::cleanPath(TestEnv::homeDir());
+#if defined(Q_OS_WIN)
+        QCOMPARE(LauncherPaths::containerDir(), home + QStringLiteral("/AppData/Roaming"));
+        QCOMPARE(LauncherPaths::defaultMinecraftDir(), LauncherPaths::containerDir() + "/.minecraft");
+#elif defined(Q_OS_MACOS)
+        QCOMPARE(LauncherPaths::containerDir(), home + QStringLiteral("/Library/Application Support"));
+        QCOMPARE(LauncherPaths::defaultMinecraftDir(), LauncherPaths::containerDir() + "/minecraft");
+#else
+        QCOMPARE(LauncherPaths::containerDir(), home);
+        QCOMPARE(LauncherPaths::defaultMinecraftDir(), home + "/.minecraft");
+#endif
+    }
+
+    void homeOverrideFromEnvironment()
+    {
+        const QString saved = qEnvironmentVariable("BILAUNCHER_HOME");
+        const auto restore = qScopeGuard([&] { TestEnv::setEnvPath("BILAUNCHER_HOME", saved); });
+
+        QCOMPARE(LauncherPaths::homeOverride(), QDir::cleanPath(TestEnv::homeDir()));
+
+        const QString other = TestEnv::freshDir("other-home");
+        TestEnv::setEnvPath("BILAUNCHER_HOME", QDir::toNativeSeparators(other));
+        QCOMPARE(LauncherPaths::homeOverride(), QDir::cleanPath(other));
+        QVERIFY(LauncherPaths::rootDir().startsWith(QDir::cleanPath(other) + u'/'));
+
+        // Относительный путь зависел бы от текущей папки — игнорируется, как и пустой.
+        for (const char *ignored : {"relative/home", ""}) {
+            qputenv("BILAUNCHER_HOME", ignored);
+            QVERIFY2(LauncherPaths::homeOverride().isEmpty(), ignored);
+        }
+    }
+
+    void filesLayout_data()
+    {
+        QTest::addColumn<QString>("actual");
+        QTest::addColumn<QString>("relative");
+
+        QTest::newRow("settings") << LauncherPaths::settingsFile() << "settings.json";
+        QTest::newRow("profiles") << LauncherPaths::profilesFile() << "profiles.json";
+        QTest::newRow("customBuilds") << LauncherPaths::customBuildsFile() << "customBuilds.json";
+        QTest::newRow("legacyBuilds") << LauncherPaths::legacyCustomBuildsFile() << "versions.json";
+        QTest::newRow("buildStorage") << LauncherPaths::buildStorageDir() << "builds";
+        QTest::newRow("buildDir") << LauncherPaths::buildDir(7) << "builds/7";
+        QTest::newRow("season") << LauncherPaths::seasonalStateFile(7) << "builds/7/season.json";
+        QTest::newRow("runtime") << LauncherPaths::runtimeDir() << "runtime";
+        QTest::newRow("java") << LauncherPaths::javaDir() << "java";
+        QTest::newRow("cache") << LauncherPaths::cacheDir() << "cache";
+        QTest::newRow("javaCatalog") << LauncherPaths::javaCatalogFile() << "cache/java_runtimes.json";
+        QTest::newRow("javaDownload") << LauncherPaths::javaDownloadDir() << "cache/java";
+        QTest::newRow("manifest") << LauncherPaths::versionManifestFile() << "cache/version_manifest.json";
+        QTest::newRow("seasonal") << LauncherPaths::seasonalCatalogFile() << "cache/seasonal_builds.json";
+        QTest::newRow("loaderCache") << LauncherPaths::loaderCacheFile("forge") << "cache/loader_forge.json";
+        QTest::newRow("loaderDownload") << LauncherPaths::loaderDownloadDir() << "cache/loaders";
+    }
+
+    void filesLayout()
+    {
+        QFETCH(QString, actual);
+        QFETCH(QString, relative);
+        QCOMPARE(actual, LauncherPaths::rootDir() + u'/' + relative);
+    }
+
+    void ensureRootCreatesTree()
+    {
+        QString error;
+        QVERIFY2(LauncherPaths::ensureRootExists(&error), qPrintable(error));
+        for (const QString &dir : {LauncherPaths::rootDir(), LauncherPaths::runtimeDir(),
+                                   LauncherPaths::cacheDir(), LauncherPaths::loaderDownloadDir(),
+                                   LauncherPaths::buildStorageDir(), LauncherPaths::javaDir(),
+                                   LauncherPaths::javaDownloadDir()}) {
+            QVERIFY2(QFileInfo(dir).isDir(), qPrintable(dir));
+        }
+        // Повторный вызов на готовом дереве — тоже успех.
+        QVERIFY(LauncherPaths::ensureRootExists(&error));
+    }
+
+    void ensureRootFailsWhenFileBlocksFolder()
+    {
+        QDir().mkpath(LauncherPaths::rootDir());
+        QFile blocker(LauncherPaths::cacheDir());
+        QVERIFY(blocker.open(QIODevice::WriteOnly));
+        blocker.close();
+
+        QString error;
+        QVERIFY(!LauncherPaths::ensureRootExists(&error));
+        QVERIFY(!error.isEmpty());
+        QVERIFY(error.contains(QDir::toNativeSeparators(LauncherPaths::cacheDir())));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestLauncherPaths)
+#include "tst_launcherpaths.moc"
@@ -0,0 +1,138 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "launcherpaths.h"
+#include "localization.h"
+
+#include <QJsonArray>
+#include <QSignalSpy>
+
+class TestLocalization : public QObject
+{
+    Q_OBJECT
+
+    Localization &loc() { return Localization::instance(); }
+
+    // Значения каталога напрямую из файла — эталон для сравнения.
+    static QJsonObject catalogEntry(const QString &key)
+    {
+        return Fixtures::readJsonFile(QStringLiteral(BILAUNCHER_SOURCE_DIR "/i18n/translations.json"))
+            .value(QStringLiteral("strings"))
+            .toObject()
+            .value(key)
+            .toObject();
+    }
+
+private slots:
+    void init()
+    {
+        TestEnv::resetLauncherRoot();
+        loc().setLanguage(QStringLiteral("en"));
+    }
+
+    void textFollowsLanguage()
+    {
+        const QJsonObject entry = catalogEntry(QStringLiteral("app.tooltip.openMods"));
+        QCOMPARE(Loc::text("app.tooltip.openMods"), entry.value("en").toString());
+
+        QSignalSpy spy(&loc(), &Localization::languageChanged);
+        loc().setLanguage(QStringLiteral("ru"));
+        QCOMPARE(spy.count(), 1);
+        QCOMPARE(loc().language(), QStringLiteral("ru"));
+        QCOMPARE(loc().resolvedLanguage(), QStringLiteral("ru"));
+        QCOMPARE(Loc::text("app.tooltip.openMods"), entry.value("ru").toString());
+
+        // Тот же язык ещё раз — без сигнала.
+        loc().setLanguage(QStringLiteral("ru"));
+        QCOMPARE(spy.count(), 1);
+    }
+
+    void unknownLanguageFallsBackToSystem()
+    {
+        QTest::ignoreMessage(QtWarningMsg, QRegularExpression(QStringLiteral("klingon")));
+        loc().setLanguage(QStringLiteral("klingon"));
+        QCOMPARE(loc().language(), QStringLiteral("system"));
+        const QString resolved = loc().resolvedLanguage();
+        QVERIFY(resolved == QLatin1String("ru") || resolved == QLatin1String("en"));
+    }
+
+    void missingKeyReturnsKey()
+    {
+#ifndef QT_NO_DEBUG
+        QTest::ignoreMessage(QtWarningMsg, QRegularExpression(QStringLiteral("no\\.such\\.key")));
+#endif
+        QCOMPARE(Loc::text("no.such.key"), QStringLiteral("no.such.key"));
+#ifndef QT_NO_DEBUG
+        QTest::ignoreMessage(QtWarningMsg, QRegularExpression(QStringLiteral("no\\.such\\.list")));
+#endif
+        QCOMPARE(Loc::list("no.such.list"), QStringList{QStringLiteral("no.such.list")});
+    }
+
+    void listsHaveSameShapeInAllLanguages()
+    {
+        const QJsonObject strings =
+            Fixtures::readJsonFile(QStringLiteral(BILAUNCHER_SOURCE_DIR "/i18n/translations.json"))
+                .value(QStringLiteral("strings"))
+                .toObject();
+        int lists = 0;
+        for (auto it = strings.constBegin(); it != strings.constEnd(); ++it) {
+            if (!it.value().toObject().value("en").isArray())
+                continue;
+            ++lists;
+            const QByteArray key = it.key().toLatin1();
+            loc().setLanguage(QStringLiteral("en"));
+            const QStringList en = Loc::list(key.constData());
+            loc().setLanguage(QStringLiteral("ru"));
+            const QStringList ru = Loc::list(key.constData());
+            QCOMPARE(en.size(), ru.size());
+            QCOMPARE(en.size(), it.value().toObject().value("en").toArray().size());
+        }
+        if (lists == 0)
+            QSKIP("в каталоге нет списков");
+    }
+
+    void availableLanguages()
+    {
+        const QVariantList languages = loc().availableLanguages();
+        QVERIFY(languages.size() >= 3);
+        QCOMPARE(languages.first().toMap().value("code").toString(), QStringLiteral("system"));
+        QStringList codes;
+        for (const QVariant &item : languages)
+            codes << item.toMap().value("code").toString();
+        QVERIFY(codes.contains("ru"));
+        QVERIFY(codes.contains("en"));
+        for (const QVariant &item : languages)
+            QVERIFY(!item.toMap().value("name").toString().isEmpty());
+    }
+
+    void storedLanguageIsReadOnLoad()
+    {
+        Fixtures::writeJson(LauncherPaths::settingsFile(), QJsonObject{{"language", "ru"}});
+        QVERIFY(loc().load());
+        QCOMPARE(loc().language(), QStringLiteral("ru"));
+
+        Fixtures::writeJson(LauncherPaths::settingsFile(), QJsonObject{{"language", "xx"}});
+        QTest::ignoreMessage(QtWarningMsg, QRegularExpression(QStringLiteral("xx")));
+        QVERIFY(loc().load());
+        QCOMPARE(loc().language(), QStringLiteral("system"));
+
+        Fixtures::write(LauncherPaths::settingsFile(), "garbage");
+        QVERIFY(loc().load());
+        QCOMPARE(loc().language(), QStringLiteral("system"));
+    }
+
+    void everyCppKeyExists()
+    {
+        // Тексты, которые код запрашивает через Loc::text("…"), должны быть в каталоге —
+        // иначе пользователь увидит сам ключ. Полная проверка — tools/check_translations.py,
+        // здесь — выборка ключей, которыми пользуются тесты.
+        for (const char *key : {"storage.error.createFailed", "storage.error.notWritable",
+                                "java.error.invalidRuntimeId", "version.error.invalidId",
+                                "launch.error.filesMissing", "auth.offline.error.noNickname"}) {
+            QVERIFY2(Loc::text(key) != QLatin1String(key), key);
+        }
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestLocalization)
+#include "tst_localization.moc"
@@ -0,0 +1,353 @@
+#include "testenv.h"
+#include "fixtures.h"
+
+#include "localization.h"
+#include "minecraftversion.h"
+
+#include <QDir>
+#include <QJsonArray>
+#include <QSysInfo>
+
+namespace {
+
+void writeVersion(const QString &gameDir, const QString &id, const QByteArray &json, bool withJar)
+{
+    const QString dir = gameDir + "/versions/" + id;
+    Fixtures::write(dir + u'/' + id + ".json", json);
+    if (withJar)
+        Fixtures::write(dir + u'/' + id + ".jar", "jar-" + id.toUtf8());
+}
+
+QString otherOs()
+{
+    return Fixtures::otherOsName();
+}
+
+// Современный ванильный json (1.19+): arguments, natives-классификаторы, logging, quickPlay.
+QByteArray modernVanilla()
+{
+    return Fixtures::readTemplate(QStringLiteral("versions/modern-1.20.1.json"));
+}
+
+} // namespace
+
+class TestMinecraftVersion : public QObject
+{
+    Q_OBJECT
+
+    QString m_game;
+
+private slots:
+    void init() { m_game = TestEnv::freshDir(QStringLiteral("game")); }
+
+    // --- правила ---------------------------------------------------------------
+
+    void rulesAllow_data()
+    {
+        QTest::addColumn<QByteArray>("rules");
+        QTest::addColumn<QStringList>("features");
+        QTest::addColumn<bool>("allowed");
+
+        QTest::newRow("no rules") << QByteArray("[]") << QStringList{} << true;
+        QTest::newRow("allow all") << QByteArray("[{\"action\":\"allow\"}]") << QStringList{} << true;
+        QTest::newRow("disallow all") << QByteArray("[{\"action\":\"disallow\"}]") << QStringList{} << false;
+        QTest::newRow("allow this os")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"name\":\"%OS%\"}}]") << QStringList{} << true;
+        QTest::newRow("allow other os only")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"name\":\"%OTHER%\"}}]") << QStringList{} << false;
+        QTest::newRow("allow all but this os")
+            << QByteArray("[{\"action\":\"allow\"},{\"action\":\"disallow\",\"os\":{\"name\":\"%OS%\"}}]")
+            << QStringList{} << false;
+        QTest::newRow("allow all but other os")
+            << QByteArray("[{\"action\":\"allow\"},{\"action\":\"disallow\",\"os\":{\"name\":\"%OTHER%\"}}]")
+            << QStringList{} << true;
+        QTest::newRow("arch matches")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"arch\":\"%ARCH%\"}}]") << QStringList{} << true;
+        QTest::newRow("arch differs")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"arch\":\"sparc\"}}]") << QStringList{} << false;
+        QTest::newRow("os version regex any")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"version\":\".*\"}}]") << QStringList{} << true;
+        QTest::newRow("os version regex none")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"version\":\"^nope$\"}}]") << QStringList{} << false;
+        QTest::newRow("os version invalid regex")
+            << QByteArray("[{\"action\":\"allow\",\"os\":{\"version\":\"(\"}}]") << QStringList{} << false;
+        QTest::newRow("feature missing")
+            << QByteArray("[{\"action\":\"allow\",\"features\":{\"is_demo_user\":true}}]") << QStringList{} << false;
+        QTest::newRow("feature present")
+            << QByteArray("[{\"action\":\"allow\",\"features\":{\"is_demo_user\":true}}]")
+            << QStringList{"is_demo_user"} << true;
+        QTest::newRow("feature must be absent")
+            << QByteArray("[{\"action\":\"allow\",\"features\":{\"has_custom_resolution\":false}}]")
+            << QStringList{} << true;
+        QTest::newRow("last match wins")
+            << QByteArray("[{\"action\":\"disallow\"},{\"action\":\"allow\"}]") << QStringList{} << true;
+    }
+
+    void rulesAllow()
+    {
+        QFETCH(QByteArray, rules);
+        QFETCH(QStringList, features);
+        QFETCH(bool, allowed);
+        rules = Fixtures::applyTemplate(rules);
+        const QSet<QString> set(features.cbegin(), features.cend());
+        QCOMPARE(VersionLoader::rulesAllow(QJsonDocument::fromJson(rules).array(), set), allowed);
+    }
+
+    void platformNames()
+    {
+        const QString os = VersionLoader::osName();
+        QVERIFY(QStringList({"windows", "osx", "linux"}).contains(os));
+        QVERIFY(!VersionLoader::osArch().isEmpty());
+        const QString classifier = VersionLoader::nativeClassifier();
+        QVERIFY(classifier.startsWith(QStringLiteral("natives-")));
+#if defined(Q_OS_MACOS)
+        QCOMPARE(os, QStringLiteral("osx"));
+        QVERIFY(classifier.startsWith(QStringLiteral("natives-macos")));
+#elif defined(Q_OS_WIN)
+        QCOMPARE(os, QStringLiteral("windows"));
+#else
+        QCOMPARE(os, QStringLiteral("linux"));
+#endif
+        if (QSysInfo::currentCpuArchitecture() == QLatin1String("arm64"))
+            QVERIFY(classifier.endsWith(QStringLiteral("-arm64")));
+    }
+
+    // --- load -------------------------------------------------------------------
+
+    void loadModernVanilla()
+    {
+        writeVersion(m_game, "1.20.1", modernVanilla(), true);
+        Fixtures::write(m_game + "/assets/log_configs/client-1.12.xml", "<xml/>");
+
+        QString error;
+        const MinecraftVersion v = VersionLoader::load(m_game, "1.20.1", {}, &error);
+        QVERIFY2(error.isEmpty(), qPrintable(error));
+        QVERIFY(v.isValid());
+        QCOMPARE(v.id, QStringLiteral("1.20.1"));
+        QCOMPARE(v.mainClass, QStringLiteral("net.minecraft.client.main.Main"));
+        QCOMPARE(v.type, QStringLiteral("release"));
+        QCOMPARE(v.assetIndexId, QStringLiteral("5"));
+        QCOMPARE(v.assetsKind, QStringLiteral("5"));
+        QCOMPARE(v.javaMajor, 17);
+        QCOMPARE(v.clientJarPath, m_game + "/versions/1.20.1/1.20.1.jar");
+        QCOMPARE(v.loggingArgument, QStringLiteral("-Dlog4j.configurationFile=${path}"));
+        QCOMPARE(v.loggingConfigPath, m_game + "/assets/log_configs/client-1.12.xml");
+        QVERIFY(v.supportsQuickPlay);
+        QVERIFY(v.hasCustomResolutionArgs);
+
+        // jvm: правило по ОС, своего -cp у версии есть — лаунчер своё не добавляет.
+        QVERIFY(v.jvmArgs.contains("-Dthis.os=yes"));
+        QVERIFY(!v.jvmArgs.contains("-Dother.os=yes"));
+        QCOMPARE(v.jvmArgs.count("-cp"), 1);
+        QVERIFY(!v.jvmArgs.contains("-Dminecraft.launcher.brand=${launcher_name}"));
+
+        // game: без фич — ни --demo, ни --width, ни quickPlay.
+        QVERIFY(v.gameArgs.contains("--username"));
+        QVERIFY(!v.gameArgs.contains("--demo"));
+        QVERIFY(!v.gameArgs.contains("--width"));
+        QVERIFY(!v.gameArgs.contains("--quickPlayMultiplayer"));
+
+        // Библиотеки: чужая ОС отфильтрована, натив только текущей платформы.
+        QStringList names;
+        for (const MinecraftLibrary &lib : v.libraries)
+            names << lib.name;
+        QVERIFY(names.contains("com.mojang:brigadier:1.1.8"));
+        QVERIFY(names.contains("org.lwjgl:lwjgl:3.3.1"));
+        QVERIFY(names.contains("org.lwjgl:lwjgl:3.3.1:" + VersionLoader::nativeClassifier()));
+        QVERIFY(!names.contains("org.lwjgl:lwjgl:3.3.1:natives-other"));
+        QVERIFY(!names.contains("only.other:lib:1.0"));
+
+        for (const MinecraftLibrary &lib : v.libraries) {
+            if (lib.name == "com.mojang:brigadier:1.1.8") {
+                QCOMPARE(lib.path, QStringLiteral("com/mojang/brigadier/1.1.8/brigadier-1.1.8.jar"));
+                QCOMPARE(lib.sha1, QStringLiteral("5244ce82c3337bba4a196a3ce858bfaecc74404a"));
+                QCOMPARE(lib.size, qint64(77392));
+                QVERIFY(!lib.native);
+            }
+            if (lib.name.endsWith(VersionLoader::nativeClassifier()))
+                QVERIFY(lib.native);
+        }
+    }
+
+    void featuresEnableArguments()
+    {
+        writeVersion(m_game, "1.20.1", modernVanilla(), true);
+        const QSet<QString> features{"has_custom_resolution", "is_quick_play_multiplayer", "is_demo_user"};
+        const MinecraftVersion v = VersionLoader::load(m_game, "1.20.1", features, nullptr);
+        QVERIFY(v.gameArgs.contains("--demo"));
+        const qsizetype width = v.gameArgs.indexOf("--width");
+        QVERIFY(width >= 0);
+        QCOMPARE(v.gameArgs.at(width + 1), QStringLiteral("${resolution_width}"));
+        QVERIFY(v.gameArgs.contains("--quickPlayMultiplayer"));
+    }
+
+    void legacyMinecraftArguments()
+    {
+        writeVersion(m_game, "1.7.10", Fixtures::read(QStringLiteral("versions/legacy-1.7.10.json")), true);
+
+        const MinecraftVersion v = VersionLoader::load(m_game, "1.7.10", {}, nullptr);
+        QVERIFY(v.isValid());
+        QCOMPARE(v.gameArgs,
+                 QStringList({"--username", "${auth_player_name}", "--session", "${auth_session}",
+                              "--gameDir", "${game_directory}"}));
+        QCOMPARE(v.assetIndexId, QStringLiteral("1.7.10"));   // нет assetIndex — берётся assets
+        QCOMPARE(v.type, QStringLiteral("release"));            // нет type — release
+        QCOMPARE(v.javaMajor, 8);                                // нет javaVersion — 8
+        QVERIFY(!v.supportsQuickPlay);
+
+        // Нет -cp в jvm — лаунчер добавляет стандартный набор.
+        QVERIFY(v.jvmArgs.contains("-cp"));
+        QVERIFY(v.jvmArgs.contains("${classpath}"));
+        QVERIFY(v.jvmArgs.contains("-Djava.library.path=${natives_directory}"));
+        QVERIFY(v.jvmArgs.contains("-Dminecraft.launcher.brand=${launcher_name}"));
+
+        bool sawNative = false;
+        for (const MinecraftLibrary &lib : v.libraries) {
+            if (lib.name == "net.minecraft:launchwrapper:1.12") {
+                // Без downloads: путь из координат, url = репозиторий + путь.
+                QCOMPARE(lib.path, QStringLiteral("net/minecraft/launchwrapper/1.12/launchwrapper-1.12.jar"));
+                QCOMPARE(lib.url, QStringLiteral("https://libraries.example/maven/net/minecraft/launchwrapper/1.12/launchwrapper-1.12.jar"));
+            }
+            if (lib.native) {
+                sawNative = true;
+                QCOMPARE(lib.extractExclude, QStringList{"META-INF/"});
+#if defined(Q_OS_WIN)
+                QVERIFY(lib.path == "lw/natives-windows-64.jar" || lib.path == "lw/natives-windows-32.jar");
+#elif defined(Q_OS_MACOS)
+                QCOMPARE(lib.path, QStringLiteral("lw/natives-osx.jar"));
+#else
+                QCOMPARE(lib.path, QStringLiteral("lw/natives-linux.jar"));
+#endif
+            }
+        }
+        QVERIFY(sawNative);
+    }
+
+    void inheritanceMergesChain()
+    {
+        writeVersion(m_game, "1.20.1", modernVanilla(), true);
+        writeVersion(m_game, "fabric-loader-0.15.0-1.20.1", Fixtures::read(QStringLiteral("versions/fabric-loader-0.15.0-1.20.1.json")), false);
+
+        QString error;
+        const MinecraftVersion v = VersionLoader::load(m_game, "fabric-loader-0.15.0-1.20.1", {}, &error);
+        QVERIFY2(error.isEmpty(), qPrintable(error));
+        QCOMPARE(v.id, QStringLiteral("fabric-loader-0.15.0-1.20.1"));
+        QCOMPARE(v.mainClass, QStringLiteral("net.fabricmc.loader.impl.launch.knot.KnotClient"));
+        QCOMPARE(v.javaMajor, 17);                                       // от родителя
+        QCOMPARE(v.assetIndexId, QStringLiteral("5"));                   // от родителя
+        QCOMPARE(v.clientJarPath, m_game + "/versions/1.20.1/1.20.1.jar"); // своего jar нет
+        QVERIFY(v.jvmArgs.contains("-DFabricMcEmu= net.minecraft.client.main.Main "));
+        QVERIFY(v.jvmArgs.contains("-Dthis.os=yes"));                    // jvm родителя
+        QVERIFY(v.gameArgs.contains("--username"));
+
+        // Дочерние библиотеки первыми и вытесняют те же group:artifact родителя.
+        QCOMPARE(v.libraries.first().name, QStringLiteral("net.fabricmc:fabric-loader:0.15.0"));
+        QStringList names;
+        for (const MinecraftLibrary &lib : v.libraries)
+            names << lib.name;
+        QVERIFY(names.contains("com.mojang:brigadier:9.9.9"));
+        QVERIFY(!names.contains("com.mojang:brigadier:1.1.8"));
+        QCOMPARE(v.libraries.first().url,
+                 QStringLiteral("https://maven.fabricmc.net/net/fabricmc/fabric-loader/0.15.0/fabric-loader-0.15.0.jar"));
+    }
+
+    void childJarWinsOverParent()
+    {
+        writeVersion(m_game, "1.20.1", modernVanilla(), true);
+        writeVersion(m_game, "custom", "{\"id\":\"custom\",\"inheritsFrom\":\"1.20.1\"}", true);
+        const MinecraftVersion v = VersionLoader::load(m_game, "custom", {}, nullptr);
+        QCOMPARE(v.clientJarPath, m_game + "/versions/custom/custom.jar");
+        QCOMPARE(v.mainClass, QStringLiteral("net.minecraft.client.main.Main"));
+    }
+
+    void loadErrors()
+    {
+        QString error;
+        MinecraftVersion v = VersionLoader::load(m_game, "missing", {}, &error);
+        QVERIFY(!v.isValid());
+        QVERIFY(error.contains(QDir::toNativeSeparators(m_game + "/versions/missing/missing.json")));
+
+        writeVersion(m_game, "broken", "{ nope", false);
+        error.clear();
+        v = VersionLoader::load(m_game, "broken", {}, &error);
+        QVERIFY(!v.isValid());
+        QVERIFY(!error.isEmpty());
+
+        writeVersion(m_game, "a", "{\"id\":\"a\",\"inheritsFrom\":\"b\",\"mainClass\":\"M\"}", false);
+        writeVersion(m_game, "b", "{\"id\":\"b\",\"inheritsFrom\":\"a\"}", false);
+        error.clear();
+        v = VersionLoader::load(m_game, "a", {}, &error);
+        QVERIFY(!v.isValid());
+        QCOMPARE(error, Loc::text("version.error.inheritsCycle").arg("a"));
+
+        // Цепочка длиннее 10 уровней.
+        for (int i = 0; i < 12; ++i)
+            writeVersion(m_game, QStringLiteral("v%1").arg(i),
+                         QStringLiteral("{\"inheritsFrom\":\"v%1\",\"mainClass\":\"M\"}").arg(i + 1).toUtf8(), false);
+        writeVersion(m_game, "v12", "{\"mainClass\":\"M\"}", false);
+        error.clear();
+        v = VersionLoader::load(m_game, "v0", {}, &error);
+        QVERIFY(!v.isValid());
+        QCOMPARE(error, Loc::text("common.error.inheritsChainTooLong").arg("v0"));
+
+        writeVersion(m_game, "nomain", "{\"id\":\"nomain\"}", false);
+        error.clear();
+        v = VersionLoader::load(m_game, "nomain", {}, &error);
+        QVERIFY(!v.isValid());
+        QCOMPARE(error, Loc::text("version.error.noMainClass").arg("nomain"));
+    }
+
+    // --- инвентарь --------------------------------------------------------------
+
+    void installedDependentsSizeRemove()
+    {
+        writeVersion(m_game, "1.20.1", modernVanilla(), true);
+        writeVersion(m_game, "forge-1", "{\"inheritsFrom\":\"1.20.1\",\"mainClass\":\"F\"}", false);
+        writeVersion(m_game, "fabric-1", "{\"inheritsFrom\":\"1.20.1\",\"mainClass\":\"F\"}", false);
+        writeVersion(m_game, "other", "{\"inheritsFrom\":\"1.19\",\"mainClass\":\"F\"}", false);
+        QDir().mkpath(m_game + "/versions/emptydir");   // без json — не версия
+
+        QCOMPARE(VersionLoader::installedVersions(m_game),
+                 QStringList({"1.20.1", "fabric-1", "forge-1", "other"}));
+        QStringList dependents = VersionLoader::dependentsOf(m_game, "1.20.1");
+        dependents.sort();
+        QCOMPARE(dependents, QStringList({"fabric-1", "forge-1"}));
+        QVERIFY(VersionLoader::dependentsOf(m_game, QString()).isEmpty());
+
+        const qint64 expected = QFileInfo(m_game + "/versions/1.20.1/1.20.1.json").size()
+                                + QFileInfo(m_game + "/versions/1.20.1/1.20.1.jar").size();
+        QCOMPARE(VersionLoader::installedSize(m_game, "1.20.1"), expected);
+        QCOMPARE(VersionLoader::installedSize(m_game, "../.."), qint64(0));
+
+        QString error;
+        QVERIFY(VersionLoader::remove(m_game, "forge-1", &error));
+        QVERIFY(!QDir(m_game + "/versions/forge-1").exists());
+        QVERIFY(VersionLoader::remove(m_game, "forge-1", &error));   // уже нет — не ошибка
+        QCOMPARE(VersionLoader::installedVersions(m_game), QStringList({"1.20.1", "fabric-1", "other"}));
+    }
+
+    void removeRejectsUnsafeIds_data()
+    {
+        QTest::addColumn<QString>("id");
+        QTest::newRow("empty") << "";
+        QTest::newRow("dotdot") << "..";
+        QTest::newRow("hidden") << ".git";
+        QTest::newRow("slash") << "a/b";
+        QTest::newRow("backslash") << "a\\b";
+    }
+
+    void removeRejectsUnsafeIds()
+    {
+        QFETCH(QString, id);
+        Fixtures::write(m_game + "/keep.txt", "keep");
+        QString error;
+        QVERIFY(!VersionLoader::remove(m_game, id, &error));
+        QCOMPARE(error, Loc::text("version.error.invalidId"));
+        QVERIFY(QFile::exists(m_game + "/keep.txt"));
+        error.clear();
+        QVERIFY(!VersionLoader::remove(QString(), "1.20.1", &error));
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestMinecraftVersion)
+#include "tst_minecraftversion.moc"
@@ -0,0 +1,46 @@
+#include "testenv.h"
+
+#include "modloader.h"
+
+class TestModLoader : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void keysRoundTrip()
+    {
+        for (ModLoader loader : {ModLoader::Forge, ModLoader::Fabric, ModLoader::NeoForge, ModLoader::Quilt}) {
+            const auto back = loaderFromKey(loaderKey(loader));
+            QVERIFY(back.has_value());
+            QCOMPARE(*back, loader);
+            QVERIFY(!loaderTitle(loader).isEmpty());
+        }
+    }
+
+    void knownKeys()
+    {
+        QCOMPARE(loaderKey(ModLoader::Forge), QStringLiteral("forge"));
+        QCOMPARE(loaderKey(ModLoader::Fabric), QStringLiteral("fabric"));
+        QCOMPARE(loaderKey(ModLoader::NeoForge), QStringLiteral("neoforge"));
+        QCOMPARE(loaderKey(ModLoader::Quilt), QStringLiteral("quilt"));
+        QCOMPARE(loaderTitle(ModLoader::NeoForge), QStringLiteral("NeoForge"));
+    }
+
+    void unknownKeys()
+    {
+        QVERIFY(!loaderFromKey(QString()).has_value());
+        QVERIFY(!loaderFromKey(QStringLiteral("Forge")).has_value());   // регистр важен
+        QVERIFY(!loaderFromKey(QStringLiteral("liteloader")).has_value());
+    }
+
+    void entryDefaults()
+    {
+        const LoaderVersionEntry entry;
+        QVERIFY(entry.stable);
+        QVERIFY(!entry.recommended);
+        QVERIFY(entry.installerUrl.isEmpty());
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestModLoader)
+#include "tst_modloader.moc"
@@ -0,0 +1,75 @@
+#include "testenv.h"
+
+#include "msaauthservice.h"
+
+#include <QUrlQuery>
+
+class TestMsaRedirect : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void authorizationUrlCarriesClientAndRedirect()
+    {
+        const QUrl url = MsaAuthService::authorizationUrl();
+        QCOMPARE(url.scheme(), QStringLiteral("https"));
+        QCOMPARE(url.host(), QStringLiteral("login.live.com"));
+        const QUrlQuery query(url);
+        QCOMPARE(query.queryItemValue("client_id"), MsaAuthService::clientId());
+        QCOMPARE(query.queryItemValue("response_type"), QStringLiteral("code"));
+        QVERIFY(!query.queryItemValue("scope").isEmpty());
+        // Код возвращается на тот адрес, который потом распознаёт matchRedirect.
+        const QUrl redirect(query.queryItemValue("redirect_uri", QUrl::FullyDecoded));
+        QString code;
+        QVERIFY(MsaAuthService::matchRedirect(QUrl(redirect.toString() + "?code=abc"), &code, nullptr));
+        QCOMPARE(code, QStringLiteral("abc"));
+    }
+
+    void matchRedirect_data()
+    {
+        QTest::addColumn<QString>("url");
+        QTest::addColumn<bool>("matches");
+        QTest::addColumn<QString>("code");
+        QTest::addColumn<QString>("error");
+
+        QTest::newRow("code in query")
+            << "https://login.live.com/oauth20_desktop.srf?code=M.C123-abc&lc=1049" << true << "M.C123-abc" << "";
+        QTest::newRow("code in fragment")
+            << "https://login.live.com/oauth20_desktop.srf#code=FRAG&state=1" << true << "FRAG" << "";
+        QTest::newRow("encoded code")
+            << "https://login.live.com/oauth20_desktop.srf?code=a%2Bb%3D" << true << "a+b=" << "";
+        QTest::newRow("error with description")
+            << "https://login.live.com/oauth20_desktop.srf?error=access_denied&error_description=The%20user%20denied"
+            << true << "" << "The user denied";
+        QTest::newRow("error only")
+            << "https://login.live.com/oauth20_desktop.srf?error=server_error" << true << "" << "server_error";
+        QTest::newRow("host case-insensitive")
+            << "https://LOGIN.LIVE.COM/oauth20_desktop.srf?code=x" << true << "x" << "";
+        QTest::newRow("redirect without params")
+            << "https://login.live.com/oauth20_desktop.srf" << true << "" << "";
+        QTest::newRow("authorize page") << "https://login.live.com/oauth20_authorize.srf?code=x" << false << "" << "";
+        QTest::newRow("foreign host") << "https://evil.example/oauth20_desktop.srf?code=x" << false << "" << "";
+        QTest::newRow("empty") << "" << false << "" << "";
+    }
+
+    void matchRedirect()
+    {
+        QFETCH(QString, url);
+        QFETCH(bool, matches);
+        QFETCH(QString, code);
+        QFETCH(QString, error);
+
+        QString actualCode = QStringLiteral("untouched");
+        QString actualError = QStringLiteral("untouched");
+        QCOMPARE(MsaAuthService::matchRedirect(QUrl(url), &actualCode, &actualError), matches);
+        if (matches) {
+            QCOMPARE(actualCode, code);
+            QCOMPARE(actualError, error);
+        } else {
+            QCOMPARE(actualCode, QStringLiteral("untouched"));
+        }
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestMsaRedirect)
+#include "tst_msaredirect.moc"
@@ -0,0 +1,65 @@
+#include "testenv.h"
+
+#include "localization.h"
+#include "zlibreference.h"
+
+#include <QDir>
+#include <QFileInfo>
+#include <QProcessEnvironment>
+
+class TestZlibReference : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void nonLinuxIsNoop()
+    {
+#if defined(Q_OS_LINUX)
+        QSKIP("только для Windows и macOS");
+#else
+        QVERIFY(!ZlibReference::systemIsZlibNg());
+        QVERIFY(ZlibReference::bundledPath().isEmpty());
+        QProcessEnvironment env;
+        env.insert(QStringLiteral("LD_PRELOAD"), QStringLiteral("/x.so"));
+        QString note = QStringLiteral("stale");
+        QVERIFY(ZlibReference::applyTo(env, &note));
+        QVERIFY(note.isEmpty());
+        QCOMPARE(env.value(QStringLiteral("LD_PRELOAD")), QStringLiteral("/x.so"));
+#endif
+    }
+
+    void linuxPreloadFollowsSystemZlib()
+    {
+#if !defined(Q_OS_LINUX)
+        QSKIP("только для Linux");
+#else
+        QProcessEnvironment env;
+        env.insert(QStringLiteral("LD_PRELOAD"), QStringLiteral("/other.so"));
+        QString note;
+        const bool ok = ZlibReference::applyTo(env, &note);
+
+        if (!ZlibReference::systemIsZlibNg()) {
+            // Обычный zlib: окружение не трогаем.
+            QVERIFY(ok);
+            QVERIFY(note.isEmpty());
+            QCOMPARE(env.value(QStringLiteral("LD_PRELOAD")), QStringLiteral("/other.so"));
+            return;
+        }
+
+        const QString bundled = ZlibReference::bundledPath();
+        if (bundled.isEmpty()) {
+            QVERIFY(!ok);
+            QCOMPARE(note, Loc::text("zlib.warning.referenceMissing"));
+            QCOMPARE(env.value(QStringLiteral("LD_PRELOAD")), QStringLiteral("/other.so"));
+        } else {
+            QVERIFY(ok);
+            // Наш zlib первым, чужой LD_PRELOAD сохраняется.
+            QCOMPARE(env.value(QStringLiteral("LD_PRELOAD")), bundled + QStringLiteral(":/other.so"));
+            QVERIFY(QFileInfo(bundled).isFile());
+        }
+#endif
+    }
+};
+
+BILAUNCHER_TEST_MAIN(TestZlibReference)
+#include "tst_zlibreference.moc"
Author	SHA1	Message	Date
galeon	3ac2156ef2	traslations fix tests / windows (push) Failing after 6m19s Details tests / linux (push) Successful in 2m12s Details tests / macos (push) Failing after 1m15s Details tests / package-smoke-linux (push) Skipped Details tests / package-smoke-windows (push) Skipped Details tests / package-smoke-macos (push) Skipped Details release / create-release (push) Successful in 3s Details release / build-linux (push) Successful in 2m17s Details release / build-macos (push) Successful in 2m44s Details release / build-windows (push) Successful in 6m27s Details release / publish (push) Successful in 1s Details Signed-off-by: galeon <dertiellis@gmail.com>	2026-10-14 09:32:17 +03:00
galeon	5d819129d6	Обновить .gitea/workflows/tests.yml tests / package-smoke-linux (push) Skipped Details tests / package-smoke-windows (push) Skipped Details tests / package-smoke-macos (push) Skipped Details tests / macos (push) Failing after 1m20s Details tests / linux (push) Successful in 2m13s Details tests / windows (push) Failing after 12m6s Details Signed-off-by: galeon <dertiellis@gmail.com>	2026-10-13 06:01:40 +00:00
galeon	0dd6bef715	test fixes tests / windows (push) Skipped Details tests / macos (push) Skipped Details tests / package-smoke-linux (push) Skipped Details tests / package-smoke-windows (push) Skipped Details tests / package-smoke-macos (push) Skipped Details tests / linux (push) Successful in 1m59s Details Signed-off-by: galeon <dertiellis@gmail.com>	2026-10-13 08:51:07 +03:00
galeon	41599fa82f	new unit tests, hehe 67 tests / linux (push) Failing after 2m18s Details tests / windows (push) Skipped Details tests / macos (push) Skipped Details tests / package-smoke-linux (push) Skipped Details tests / package-smoke-windows (push) Skipped Details tests / package-smoke-macos (push) Skipped Details Signed-off-by: galeon <dertiellis@gmail.com>	2026-10-12 13:14:08 +03:00
galeon	ebf8ff7869	release workflow fix Signed-off-by: galeon <dertiellis@gmail.com>	2026-10-12 09:25:48 +03:00