How can I handle errors in Jest tests?

How can I handle errors in Jest tests?

You can handle errors in Jest by using try-catch blocks or by returning a rejected promise in your tests.

Can you give me an example of using try-catch in a Jest test?

Sure! Here's a simple example:

test('throws an error', () => {
  try {
    functionThatThrows();
  } catch (e) {
    expect(e).toBeInstanceOf(Error);
  }
});

What about handling asynchronous errors?

For asynchronous errors, you can return a promise and use .rejects or async/await with try-catch:

test('async error handling', async () => {
  await expect(asyncFunction()).rejects.toThrow(Error);
});

Are there any best practices for error handling in Jest?

Yes, always ensure your tests are clear and concise. Use descriptive error messages and consider edge cases.