What is the Async Testing Library and how do I use it?

What is the Async Testing Library and how do I use it?

The Async Testing Library is a set of utilities for testing asynchronous code in JavaScript applications. It helps you write tests that are easier to read and maintain.

Can you give me an example of how to test a promise with it?

Sure! You can use waitFor to wait for a promise to resolve. For example:

import { render, waitFor } from '@testing-library/react';

test('loads and displays greeting', async () => {
  const { getByText } = render(<Greeting />);
  await waitFor(() => getByText('Hello, World!'));
});

What are some common pitfalls when using it?

Common pitfalls include not properly awaiting asynchronous actions, which can lead to false positives in tests, and not cleaning up after tests, which can cause state leakage.

How does it compare to other testing libraries?

The Async Testing Library focuses specifically on testing asynchronous code, while other libraries may not provide the same level of support for async operations. It's often used in conjunction with libraries like Jest.