What are some advanced features of Jest?

What are some advanced features of Jest?

Jest offers several advanced features like snapshot testing, mocking, and code coverage. Would you like to know more about any specific feature?

Can you explain snapshot testing?

Snapshot testing allows you to capture the rendered output of a component and compare it to a saved snapshot. If the output changes, Jest will alert you.

How does mocking work in Jest?

Mocking in Jest allows you to replace functions or modules with mock implementations. This is useful for isolating tests and controlling dependencies.

What is code coverage and how can I check it in Jest?

Code coverage measures how much of your code is tested. You can check it in Jest by running tests with the --coverage flag.

Are there any best practices for using these features?

Yes, it's best to keep your snapshots up to date, use mocks judiciously to avoid false positives, and regularly check your code coverage to ensure comprehensive testing.