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Jest · Delightful JavaScript Testing Jest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase It allows you to write tests with an approachable, familiar and feature-rich API that gives you results quickly
Getting Started - Jest Jest can be used in projects that use webpack to manage assets, styles, and compilation webpack does offer some unique challenges over other tools Refer to the webpack guide to get started Using Vite Jest is not supported by Vite due to incompatibilities with the Vite plugin system
Jest 30: Faster, Leaner, Better · Jest - jestjs. io Today we are happy to announce the release of Jest 30 This release features a substantial number of changes, fixes, and improvements While it is one of the largest major releases of Jest ever, we admit that three years for a major release is too long
Configuring Jest · Jest Jest attempts to scan your dependency tree once (up-front) and cache it in order to ease some of the filesystem churn that needs to happen while running tests This config option lets you customize where Jest stores that cache data on disk
Testing React Apps · Jest Don't forget to install the @babel core and babel-preset-jest packages for this example to work To make this work with Jest you need to update your Jest configuration with this: "transform": {"\\ js$": "path to custom-transformer js"}
From v29 to v30 · Jest - jestjs. io Jest has introduced significant under-the-hood changes to how its packages are bundled and exported: All of Jest’s internal modules are now bundled into single files for faster startup This means when you install Jest, the number of files it loads is greatly reduced (improving performance)
Globals - Jest In your test files, Jest puts each of these methods and objects into the global environment You don't have to require or import anything to use them However, if you prefer explicit imports, you can do import {describe, expect, test} from '@jest globals'
Expect - Jest Jest adds the inlineSnapshot string argument to the matcher in the test file (instead of an external snap file) the first time that the test runs Check out the section on Inline Snapshots for more info
Jest CLI Options The jest command line runner has a number of useful options You can run jest --help to view all available options Many of the options shown below can also be used together to run tests exactly the way you want Every one of Jest's Configuration options can also be specified through the CLI
Getting Started - Jest You can run Jest directly from the CLI (if it's globally available in your PATH, e g by yarn global add jest or npm install jest --global) with a variety of useful options Here's how to run Jest on files matching my-test , using config json as a configuration file and display a native OS notification after the run: