React Testing Best Practices Expert guidance for writing maintainable, user-centric React component tests with Testing Library. Focused on query selection, accessibility-first testing, and avoiding implementation details. NEVER Do When Writing React Tests - NEVER query by test IDs before trying accessible queries - Test IDs bypass accessibility verification: a button with but no accessible name works in tests but fails for screen reader users. When tests pass with test IDs, you ship inaccessible UIs. Query hierarchy: . Each step down this list means less confidence your UI is usable. - NEVER…