git:20260307.561353f to git:20260308.50de2bd

1 added, 1 removed. Audit A to A.

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name: test-implement

- description: Test implementation patterns and conventions. Use when implementing unit tests, integration tests, or E2E tests. See references/frontend.md for RTL+Vitest+MSW component testing, references/e2e.md for Playwright E2E testing.

+ 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.

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# Test Implementation Patterns

## Reference Selection

| Test Type | Reference | When to Use |

|-----------|-----------|-------------|

| **Unit / Integration** | [references/frontend.md](references/frontend.md) | Implementing React component tests with RTL + Vitest + MSW |

| **E2E** | [references/e2e.md](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