What are the best practices for testing async functions with Testing Library?

What are the best practices for testing async functions with Testing Library?

When testing async functions with Testing Library, it's important to use waitFor and findBy queries to handle asynchronous updates.

Can you give me an example of using waitFor?

Sure! You can use waitFor to wait for an element to appear in the DOM after an async operation, like this:

await waitFor(() => {
  expect(screen.getByText('Loaded')).toBeInTheDocument();
});

What about error handling in async tests?

For error handling, you can use rejects with expect to assert that a promise is rejected, ensuring your tests cover error scenarios.

Are there any specific tools or libraries that complement Testing Library for async testing?

Yes, tools like Jest for mocking and MSW (Mock Service Worker) for API mocking can enhance your async testing experience.