Review React 19 test quality including coverage, patterns, and React 19 API testing. Use when reviewing tests or test coverage.
For Vitest configuration validation (pool options, coverage setup, deprecated patterns), see vitest-4/skills/reviewing-vitest-config/SKILL.md.
renderHookuseActionStateuseOptimistic updates tested for immediate feedbackuseFormStatus tested within form component contextuse() hook tested with Promises and Context@testing-library/react and @testing-library/user-eventgetByRole, getByLabelText)waitFor used for async assertionswaitFor)For typed test fixtures and mocks, use the TYPES-generics skill from the typescript plugin.
For comprehensive testing patterns, see: research/react-19-comprehensive.md.