How do I set up Jest in my React Native project?

How do I set up Jest in my React Native project?

To set up Jest in your React Native project, you need to install Jest and its dependencies. You can do this by running npm install --save-dev jest @testing-library/react-native.

Do I need to configure anything after installation?

Yes, you should add a Jest configuration in your package.json or create a separate jest.config.js file to specify settings like test environment and coverage.

What about testing components? How do I write a test?

You can write a test by creating a __tests__ directory and adding a test file. Use import { render } from '@testing-library/react-native'; to render your component and then use assertions to check its behavior.

Can I run the tests in watch mode?

Yes, you can run Jest in watch mode by using the command npm test -- --watch. This will re-run tests on file changes.