vitest-react-testing

Unit tests for React components use Vitest as the test runner, React Testing Library for user-centric queries, and the ARRANGE-ACT-ASSERT structure. Write tests alongside components, run `vitest` to execute, and use userEvent to simulate interactions instead of test IDs for reliable component validation.

Mock API requests using MSW (Mock Service Worker) to intercept HTTP calls and return predictable responses. This ensures test isolation and reliable behavior validation without depending on real endpoints, enabling consistent unit and component tests across your test suite.

Vitest delivers fast feedback through native ES modules support and parallel test execution, making it faster than Jest for most React projects. It integrates seamlessly with React Testing Library and MSW while maintaining the same testing patterns, reducing setup complexity.

Yes, Vitest supports testing custom hooks and asynchronous behavior. Combine it with React Testing Library utilities to validate hook logic, state updates, and side effects in isolation, following TDD workflows for safer hook development.

No, but Vitest supports strict TDD workflows with Red → Green → Refactor cycles if desired. You can write tests before, after, or alongside code; the Skill emphasizes test-driven practices to enforce functional and technical requirements, but flexibility remains.

Set up Vitest as your test runner, install React Testing Library for component queries, and configure MSW for API mocking. The Skill provides Vitest configuration guidance and assumes familiarity with React fundamentals and basic testing concepts.