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Android Testing

Standards for Unit Tests, UI Tests (Compose), and Hilt Integration. Use whenever writing Android test files or asking about runTest, composeTestRule, HiltAndroidRule, MockK, MainDispatcherRule, @TestInstallIn, or how to test a ViewModel/Composable/Repository in Android. (triggers: **/*Test.kt, **/*Rule.kt, @Test, runTest, composeTestRule, HiltAndroidTest, MockK, createAndroidComposeRule, MainDispatcherRule, @TestInstallIn)

ComeOnOliver Updated 61 repo stars
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Android Testing Standards

Priority: P0

Implementation Guidelines

Unit Tests

  • Scope: ViewModels, Usecases, Repositories, Utils.
  • Coroutines: Use runTest (kotlinx-coroutines-test). Use MainDispatcherRule to mock Main dispatcher.
  • Mocking: Use MockK.

UI Integration Tests (Instrumentation)

  • Scope: Composable Screens, Navigation flows.
  • Rules: Use createAndroidComposeRule + Hilt (HiltAndroidRule).
  • Isolation: Fake repositories in DI modules (@TestInstallIn).

Anti-Patterns

  • No Real Network in Tests: Always mock with MockK or fake repositories via @TestInstallIn.
  • No Thread.sleep: Use IdlingResource or composeTestRule.waitUntil for async timing.

References

  • Test Rules

ComeOnOliver/skillshub/tree/main/skills/HoangNguyen0403/agent-skills-standard/android-testing commit ac0b468df3

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