What is Jest?

Developed by Facebook, Jest is an open-source automation testing framework to test React and React Native-based web applications. It is built on JavaScript.

Unit tests for the frontend layer are typically unsuitable as they need more configuration, which can be tedious. However, you can reduce this complexity to a great extent with the help of the Jest framework.

Jest can be used to test almost everything around JavaScript, like the browser rendering of your web apps. It also comes with a package of an assertion library with a test runner and a built-in mocking library. Jest framework also offers screenshot testing to validate the delta changes of the websites that are transformed after a specific time. In addition, it has built-in support for code coverage to generate test reports.

Here is a quick rundown of the important features of the Jest framework.

• Speed and performance.
• Pre-commit hooks.
• Full package.
• Easy to migrate.
• Packed with advanced features and configuration.

We have also compiled all the Jest Interview Questions in here. Feel free to visit it.

To learn more about the Jest framework, check our complete Jest tutorial.