By name: test-implement description: Test implementation patterns and conventions. Use when implementing unit tests, integration tests, or E2E tests, including RTL+Vitest+MSW component testing and Playwright E2E testing.
Test Implementation Patterns
Reference Selection
| Test Type | Reference | When to Use |
|---|---|---|
| Unit / Integration | references/frontend.md | Implementing React component tests with RTL + Vitest + MSW |
| E2E | references/e2e.md | Implementing browser-level E2E tests with Playwright |
Common Principles
AAA Structure
All tests follow Arrange-Act-Assert:
- Arrange: Set up preconditions and inputs
- Act: Execute the behavior under test
- Assert: Verify the expected outcome
Test Independence
- Each test runs independently without depending on other tests
- No shared mutable state between tests
- Deterministic execution — no random or time dependencies without mocking
Naming
- Test names describe expected behavior from user perspective
- One test verifies one behavior