How do I set up Jest snapshot testing?

How do I set up Jest snapshot testing?

To set up Jest snapshot testing, first ensure you have Jest installed in your project. You can do this by running npm install --save-dev jest.

What files do I need to create for snapshot testing?

You typically need a test file that corresponds to the component you want to test. For example, if you have a Button.js, create a Button.test.js.

How do I create a snapshot in my test?

In your test file, you can use expect(component).toMatchSnapshot(); after rendering your component. This will create a snapshot file.

Can I update snapshots if they change?

Yes! If your component changes and you want to update the snapshot, run your tests with the -u flag: jest -u.