Jest 28 is finally here, and it comes with some long requested features such as support for sharding a test run across multiple machines, package exports and the ability to customize the behavior of fake timers. These are just some personal highlights, and we'll be highlighting more in this blog post.

Jest is a JavaScript testing framework developed by Facebook, designed to simplify the process of writing and running tests for JavaScript applications, particularly those built with React. With features such as snapshot testing, mocking, and code coverage reporting, Jest enables developers to write  and reliable tests for their JavaScript codebases. Developers can learn how to use Jest to write effective unit tests, integration tests, and end-to-end tests for their applications, ensuring code quality and stability throughout the development lifecycle.

Jest

Jest 28 is the latest version of the open-source JavaScript test suite. It adds support for sharding a test run across multiple machines, package exports and the ability to customize the behavior of fake timers. The list of breaking changes is long, but for migration purposes we've written a guide you can follow.

Jest 28: Shedding weight and improving compatibility 🫶 · Jest