How do I set up Jest snapshots in my project?

How do I set up Jest snapshots in my project?

To set up Jest snapshots, 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 the snapshots?

You don't need to create any specific files for snapshots. Jest will automatically create a __snapshots__ folder when you run your tests.

How do I write a test that uses snapshots?

You can write a test using toMatchSnapshot() method. For example:

it('renders correctly', () => {
  const tree = renderer.create(<MyComponent />).toJSON();
  expect(tree).toMatchSnapshot();
});

Can I update the snapshots if they change?

Yes, you can update snapshots by running the tests with the -u flag: jest -u. This will update all outdated snapshots.