react-testing

# React Testing Library

Test React components the way users interact with them.

## Agent Workflow (MANDATORY)

Before ANY implementation, launch in parallel:

1. **fuse-ai-pilot:explore-codebase** - Analyze existing test patterns
2. **fuse-ai-pilot:research-expert** - Verify latest Testing Library docs via Context7/Exa
3. **mcp__context7__query-docs** - Check userEvent, waitFor patterns

After implementation, run **fuse-ai-pilot:sniper** for validation.

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## Overview

### When to Use

- Testing React component behavior
- Validating user interactions
- Ensuring accessibility compliance
- Mocking API calls with MSW
- Testing custom hooks
- Testing React 19 features (useActionState, use())

### Why React Testing Library

| Feature | Benefit |
|---------|---------|
| User-centric | Tests what users see |
| Accessible queries | Encourages a11y markup |
| No implementation details | Resilient to refactoring |
| Vitest integration | 10-20x faster than Jest |

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## Critical Rules

1. **Query by role first** - `getByRole` is most accessible
2. **Use userEvent, not fireEvent** - Realistic interactions
3. **waitFor for async** - Never `setTimeout`
4. **MSW for API mocking** - Don't mock fetch
5. **Test behavior, not implementation** - No internal state testing

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## Reference Guide

### Concepts

| Topic | Reference |
|-------|-----------|
| Setup & installation | `references/installation.md` |
| Query priority | `references/queries.md` |
| User interactions | `references/user-events.md` |
| Async patterns | `references/async-testing.md` |
| API mocking | `references/msw-setup.md` |
| React 19 hooks | `references/react-19-hooks.md` |
| Accessibility | `references/accessibility-testing.md` |
| Custom hooks | `references/hooks-testing.md` |
| Vitest config | `references/vitest-config.md` |
| Mocking patterns | `references/mocking-patterns.md` |

### Templates

| Template | Use Case |
|----------|----------|
| `templates/basic-setup.md` | Vitest + RTL + MSW config |
|