What are some effective error handling strategies in Jest?

What are some effective error handling strategies in Jest?

In Jest, you can use try-catch blocks, custom error messages, and the .rejects and .resolves matchers for promises.

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

Sure! Here's a simple example:

test('throws an error', () => {
  expect(() => { throw new Error('Error!'); }).toThrow('Error!');
});

What about handling asynchronous errors?

For asynchronous errors, you can use the .rejects matcher like this:

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

Are there any best practices for error handling in Jest?

Yes, always provide clear error messages, test both success and failure cases, and keep your tests isolated.