How can I improve the performance of async tests in Jest?

How can I improve the performance of async tests in Jest?

To improve the performance of async tests in Jest, consider using the --runInBand option to run tests serially, which can reduce overhead.

Are there any specific strategies for optimizing the setup and teardown processes?

Yes, you can use beforeAll and afterAll hooks to set up and tear down resources once for all tests, rather than for each test.

What about using mocks? Do they help with performance?

Absolutely! Using mocks can speed up tests by avoiding slow network calls or database queries, making your tests run faster.

Is there a way to measure the performance of my tests?

You can use Jest's built-in performance metrics by running tests with the --detectOpenHandles flag to identify slow tests.