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Frequently Asked Questions

Why should you use jest?

It allows you to write tests with an approachable, familiar and feature-rich API that gives you results quickly. Jest is well-documented, requires little configuration and can be extended to match your requirements. Jest makes testing delightful. The Jest core team and contributors regularly speak about Jest and Delightful JavaScript Testing.

What is the difference between vitest and jest?

Refer to the vite guide to get started. Alternatively you can use vitest. Jest can be used in projects that use parcel-bundler to manage assets, styles, and compilation similar to webpack. Parcel requires zero configuration. Refer to the official docs to get started.

What is the use of run function in jest?

Runs a function before each of the tests in this file runs. If the function returns a promise or is a generator, Jest waits for that promise to resolve before running the test.

What is the latest version of jest?

This is documentation for Jest 26.x, which is no longer actively maintained. For up-to-date documentation, see the latest version ( 29.3 ). Note: Jest documentation uses yarn commands, but npm will also work. You can compare yarn and npm commands in the yarn docs, here.


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