How do I test async components in Vue 3?

How do I test async components in Vue 3?

To test async components in Vue 3, you can use the Vue Test Utils library along with Jest. Start by mounting the component and then use await to wait for the async operation to complete.

Can you give me an example of a test case?

Sure! Here's a simple example:

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

test('renders async component', async () => {
  const wrapper = mount(AsyncComponent);
  await wrapper.vm.$nextTick(); // wait for async data
  expect(wrapper.text()).toContain('Expected Text');
});

What if the async operation fails?

If the async operation fails, you can test for error handling by mocking the async function to throw an error and then asserting that the error message is displayed in the component.

Are there any best practices for testing async components?

Yes, some best practices include keeping your tests isolated, using mocks for async data, and ensuring that you clean up after each test to avoid state leakage.