React Testing Library Mastery

Test React UI with user-centric strategies and resilient testing patterns.

Basic

Learn RTL philosophy, setup, rendering, and writing your first component test.

Choose getBy, queryBy, and findBy queries following Testing Library priority.

Use jest-dom matchers for DOM state, visibility, forms, and accessibility.

Simulate realistic clicks, typing, and form submission with userEvent.

Handle asynchronous UI updates with waitFor, findBy, and act.

Mock modules, functions, and HTTP with Jest and Mock Service Worker.

Test custom hooks with renderHook and act from React Testing Library.

Master role, label, and accessible name queries for inclusive tests.

Configure React Testing Library with Vitest for fast ESM-native test runs.

Custom render, providers, setup patterns, and accessibility testing.

Detect unnecessary re-renders and validate memoization in components.

Write maintainable RTL tests avoiding implementation details and common pitfalls.