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 | P…