# Android Testing

> Write Android unit, Compose UI, and Hilt-integrated tests. Use when designing test behavior with MockK or coroutine test utilities; defer database/WorkManager-specific recipes to the owning feature skill.

- Skill: `hoangnguyen0403/android-testing` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds add hoangnguyen0403/android-testing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hoangnguyen0403/android-testing/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: HoangNguyen0403 (https://skillmd.com/u/hoangnguyen0403)
- Updated: 2026-08-19
- Page: https://skillmd.com/skills/hoangnguyen0403/android-testing

---

# Android Testing Standards

## **Priority: P0 (CRITICAL)**

## 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](references/implementation.md)