Unit/UI Tests in CI

Copy code# .github/workflows/unit-tests.yml
jobs:
  unit-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-java@v3
        with: { java-version: '17', distribution: 'temurin', cache: 'gradle' }

      - name: Run unit tests
        run: ./gradlew testDebugUnitTest

      - name: Upload results
        if: always()
        uses: actions/upload-artifact@v3
        with:
          name: unit-test-results
          path: "**/build/reports/tests/testDebugUnitTest/"

      - name: Publish test report
        uses: dorny/test-reporter@v1
        if: always()
        with:
          name: Unit Tests
          path: "**/build/test-results/testDebugUnitTest/*.xml"
          reporter: java-junit

Copy code  instrumented-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-java@v3
        with: { java-level: '17', distribution: 'temurin', cache: 'gradle' }

      # Enable KVM for hardware acceleration (2-5x faster emulator boot)
      - name: Enable KVM group perms
        run: |
          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | \
            sudo tee /etc/udev/rules.d/99-kvm4all.rules
          sudo udevadm control --reload-rules
          sudo udevadm trigger --name-match=kvm

      - name: Run instrumented tests
        uses: reactivecircus/android-emulator-runner@v2
        with:
          api-level: 33
          arch: x86_64
          profile: Nexus 6
          avd-name: test_avd
          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim
          disable-animations: true
          script: ./gradlew connectedDebugAndroidTest

      - name: Upload results
        if: always()
        uses: actions/upload-artifact@v3
        with:
          name: instrumented-test-results
          path: "**/build/reports/androidTests/connected/"

Copy code@get:Rule
val rule = createComposeRule()

@Test
fun articleList_showsTitle() {
    rule.setContent {
        ArticleListScreen(
            articles = listOf(Article("1", "Hello World", "", 0L, ""))
        )
    }

    rule.onNodeWithText("Hello World").assertIsDisplayed()
}

Copy code  screenshot-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-java@v3
        with: { java-version: '17', distribution: 'temurin', cache: 'gradle' }

      - name: Verify screenshots
        run: ./gradlew verifyPaparazziDebug

      - name: Upload diffs on failure
        if: failure()
        uses: actions/upload-artifact@v3
        with:
          name: screenshot-diffs
          path: "**/build/paparazzi/failures/"

Copy code  instrumented-test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        api-level: [29, 31, 33]
        include:
          - api-level: 29
            arch: x86
          - api-level: 31
            arch: x86_64
          - api-level: 33
            arch: x86_64
    steps:
      - uses: reactivecircus/android-emulator-runner@v2
        with:
          api-level: ${{ matrix.api-level }}
          arch: ${{ matrix.arch }}
          script: ./gradlew connectedDebugAndroidTest

Copy code      - name: Run tests (retry on flake)
        run: |
          ./gradlew connectedDebugAndroidTest || \
          ./gradlew connectedDebugAndroidTest || \
          ./gradlew connectedDebugAndroidTest

Copy code@FlakyTest(bugId = 123)
@Test
fun occasionallyFlakyTest() { /* ... */ }

Copy code# Exclude flaky tests from regular CI run
./gradlew connectedDebugAndroidTest -Pandroid.testInstrumentationRunnerArguments.notAnnotation=androidx.test.filters.FlakyTest