React Testing: Jest Unit Tests and E2E Implementation Examples
The Facebook React repository demonstrates a comprehensive testing strategy combining Jest unit tests and end-to-end testing approaches. The test suite covers critical areas like JSX runtime implementations across different React versions (14-17), Fiber configuration validation, and component lifecycle behaviors, showcasing best practices in React testing framework implementation. Qodo Tests Hub provides developers with deep insights into React's testing patterns by organizing and analyzing the repository's test implementations. Through the platform, developers can explore real-world examples of React component testing, understand JSX runtime validation approaches, and learn from Facebook's testing practices for building reliable React applications. The test explorer makes it easy to navigate through different test types and understand their implementation details.
| Path | Test Type | Language | Description |
|---|---|---|---|
| fixtures/legacy-jsx-runtimes/react-16/react-16.test.js |
unit
|
javascript | This Jest unit test verifies React 16’s JSX runtime implementation including element creation, prop handling, and component validation. |
| fixtures/legacy-jsx-runtimes/react-14/react-14.test.js |
unit
|
javascript | This Jest unit test verifies React JSX element creation, prop handling, and component lifecycle behavior in React 14. |
| packages/react-reconciler/src/forks/ReactFiberConfig.test.js |
unit
|
javascript | This JavaScript unit test verifies React Fiber configuration settings and environment setup for test renderer and client console components. |
| fixtures/legacy-jsx-runtimes/react-15/react-15.test.js |
unit
|
javascript | This Jest unit test verifies React 15’s JSX runtime implementation including element creation, props handling, and component validation. |
| compiler/apps/playground/__tests__/e2e/page.spec.ts |
e2e
|
typescript | This Playwright e2e test verifies React Playground’s code compilation, editor functionality, and syntax support across different JavaScript patterns. |
| packages/react-devtools-inline/__tests__/__e2e__/components.test.js |
e2e
|
javascript | This Playwright e2e test verifies React DevTools component inspection, manipulation, and search functionality in an inline implementation. |
| fixtures/attribute-behavior/src/App.test.js |
unit
|
javascript | This Jest unit test verifies basic rendering functionality of a React application’s root component. |
| fixtures/legacy-jsx-runtimes/react-17/react-17.test.js |
unit
|
javascript | This Jest unit test verifies React 17’s JSX runtime implementation including element creation, prop handling, and ref management. |
| packages/react-devtools-inline/__tests__/__e2e__/profiler.test.js |
e2e
|
javascript | This Playwright E2E test verifies React DevTools Profiler’s snapshot recording and navigation functionality. |
| fixtures/flight/__tests__/__e2e__/smoke.test.js |
e2e
|
javascript | This Playwright E2E test verifies React component hydration, prerendering, and error handling behavior. |