What are the best practices for testing a Create React App?

What are the best practices for testing a Create React App?

Some best practices include using Jest for unit tests, React Testing Library for component tests, and ensuring good coverage.

How do I set up Jest in my Create React App?

Jest is already included in Create React App. You can start writing tests in the src folder with .test.js files.

What should I test in my components?

Focus on testing props, state changes, and user interactions. Ensure that your components render correctly.

Can I test asynchronous code?

Yes, you can test asynchronous code using Jest's async/await syntax or by returning a promise in your tests.

Any tips for improving test performance?

Use jest.runAllTimers() for testing timers, avoid unnecessary re-renders, and mock heavy dependencies.