A Few Things I Wish I'd Known Earlier About Jest

Things That Make More Sense in Practice

Jest bundles a test runner, an assertion library, and mocking tools together, with almost no configuration needed. Jest supports running tests in parallel, which noticeably speeds up large test suites.

Why They Matter

Jest is a JavaScript testing framework built by Facebook and the de facto default for most React projects. Tutorials often gloss over points like these, but they make a real difference on an actual project.