react-testing-library-best-practices
React Testing Library Best Practices
Comprehensive testing guide for React components using Testing Library, designed for AI agents and LLMs. Contains 43 rules across 9 categories, prioritized by impact to guide test writing and code review.
When to Apply
Reference these guidelines when:
- Writing new component tests with React Testing Library
- Selecting queries (getByRole, getByLabelText, etc.)
- Handling async operations in tests (findBy, waitFor)
- Simulating user interactions (userEvent)
- Reviewing tests for anti-patterns and implementation detail testing
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Query Selection | CRITICAL | query- |
| 2 | Async Handling | CRITICAL | async- |
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