---
name: shinpr/test-implement
source: https://app.decimal.ai/s/shinpr-test-implement@2/SKILL.md
source_sha256: 713ac5acc4c7
---

# Test Implementation Patterns

## Reference Selection

| Test Type | Reference | When to Use |
|-----------|-----------|-------------|
| **Unit / Integration** | [references/frontend.md](references/frontend.md) | Implementing React component tests with the repository's configured runner and network mocking layer |
| **E2E** | [references/e2e.md](references/e2e.md) | Implementing browser-level E2E tests in the existing harness, or Playwright when the approved work introduces a harness |

## 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 — mock random and time dependencies

### Naming
- Test names describe expected behavior from user perspective
- One test verifies one behavior