A Few Practical Notes on Jest

Points Worth Knowing

• Jest's snapshot testing saves a component's output and warns you about unexpected changes on later runs.
• Jest supports running tests in parallel, which noticeably speeds up large test suites.
• Jest's mock functions let you simulate external behavior, like an API call, without hitting a real server.

Takeaway

None of these points are complicated on their own, but knowing them can lead to better technical decisions about Jest on your next project.