React Testing Library

React Testing Library forces you to test your components the way users interact with them: clicking buttons, filling forms, reading text on screen. Instead of testing implementation details (state, props, lifecycle), you test what the user sees and does.

MIT licensed, created by Kent C. Dodds. This is the default testing approach for React. Create React App ships with it. The React docs recommend it. Most React job postings expect you to know it.

Fully free. It's an npm package. No paid tier, no service.

The catch: the philosophy is opinionated and that's the point. You can't easily test internal component state or mock child components, by design. If you're coming from Enzyme, the transition is a mindset shift. Some complex UI interactions (drag-and-drop, canvas, virtual scrolling) are hard to test with this approach. And for end-to-end testing (real browser, real clicks), you still need Playwright or Cypress. React Testing Library runs in jsdom, not a real browser.