How do I test async data in Vue components using Vue Test Utils?

How do I test async data in Vue components using Vue Test Utils?

You can test async data in Vue components by using the await keyword with the vm.$nextTick() method after triggering the async operation.

Can you provide a code example for that?

Sure! Here's a simple example:

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

test('fetches async data', async () => {
  const wrapper = mount(MyComponent);
  await wrapper.vm.fetchData(); // Trigger the async method
  await wrapper.vm.$nextTick(); // Wait for the DOM to update
  expect(wrapper.text()).toContain('Expected Data');
});

What if the async call fails?

You can mock the async call to simulate a failure. Use jest.mock to return a rejected promise and then assert the error handling in your component.

Are there any best practices for testing async data?

Yes! Always ensure to clean up after tests, use mocks for API calls, and test both success and error scenarios.