Programming is an artJosh SoftwareJest is a JavaScript Testing Framework used for Testing React Native applications to ensure the stability and correctness of your codebase.Here are a steps to getting started with testing React Native using Jest:1. Create a new React Native project using the React Native CLI2. Install Jest: 3. Configure Jest: Create a file called jest.config.js in your project’s root directory and add the following content:4. Write your tests: Create a directory called __tests__ in your project’s root directory. You can create test files with the .test.js or .spec.js extension5. Run your tests: npx jestJest will automatically discover and run your tests, providing you with test results and coverage information.Test componentBelow example of welcome component with a view and text components and some styles.Snapshot TestNow, let’s use React’s test renderer and Jest’s snapshot feature to interact with the component and capture the rendered output in snapshot file.Now, run yarn test or jest, this will produce an output file.ExpectExpect is function, used every time you want to test a value. You have to use expect along with a matcher function to assert something about a value.ModifiersModifiers are special keywords that you can use with matchers to enhance the behavior of your test assertions. They allow you to perform more specific and nuanced checks during testing. Here some modifiers with example:MatchersMatchers are functions provided by the framework that allow you to make assertions in your tests. These assertions check whether a particular condition is true or false. Here some matchers with example:Mock Functionslet you spy on the behavior of a function that is called indirectly by some other code, rather than only testing the output.You can create a mock function with jest.fn().ConclusionIn this blog, we have learned how to set up Jest in a React Native project and write tests using Jest. Testing is important for ensuring the quality and stability of your React Native applications. And by using Jest, you can easily write tests for your components and improve the overall reliability of your app.Reference: https://jestjs.io/docs/getting-startedFill in your details below or click an icon to log in:You are commenting using your WordPress.com account.( Log Out / Change )You are commenting using your Facebook account.( Log Out / Change )Connecting to %s Notify me of new comments via email. Notify me of new posts via email. Δdocument.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );This site uses Akismet to reduce spam. Learn how your comment data is processed.