How can I use Jest snapshots with Vue CLI?

What are Jest snapshots and how do they work with Vue CLI?

Jest snapshots are a way to test the rendered output of your components. They save the output of a component's render method and compare it to future renders to detect changes.

How do I set up Jest snapshots in my Vue CLI project?

You can set up Jest snapshots by installing the necessary dependencies and creating a test file for your component. Use vue-test-utils to mount your component and then call toMatchSnapshot() in your test.

Can you show me an example of a test using Jest snapshots?

Sure! Here's a simple example:

import { shallowMount } from '@vue/test-utils';
import MyComponent from '@/components/MyComponent.vue';

test('renders correctly', () => {
  const wrapper = shallowMount(MyComponent);
  expect(wrapper.element).toMatchSnapshot();
});

What should I do if my snapshot test fails?

If your snapshot test fails, it means the rendered output has changed. You can either update the snapshot using jest --updateSnapshot or investigate the changes to ensure they are expected.