How do I test async components in Vue?

How do I test async components in Vue?

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

Can you show me a code example?

Sure! Here's a simple example:

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

test('loads async data', async () => {
  const wrapper = mount(AsyncComponent);
  await wrapper.vm.$nextTick(); // wait for the next tick
  await wrapper.vm.loadData(); // call the async method
  expect(wrapper.text()).toContain('Loaded Data');
});

What if the async call fails?

You can test for error handling by mocking the async call to throw an error. Use jest.mock to simulate the failure and check if the component reacts accordingly.

Are there any best practices for testing async components?

Yes, some best practices include keeping your tests isolated, using mocks for external calls, and ensuring your tests are deterministic.