android-testing

name

android-testing

description

Write Unit Tests, UI Tests (Compose), and Hilt-integrated tests for Android. 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)

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