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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
    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:
  • Testing React Apps · Jest
    At Facebook, we use Jest to test React applications Setup Setup with Create React App If you are new to React, we recommend using Create React App It is ready to use and ships with Jest! You will only need to add react-test-renderer for rendering snapshots Run
  • 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
  • Testing Web Frameworks · Jest
    Jest is a universal testing platform, with the ability to adapt to any JavaScript library or framework In this section, we'd like to link to community posts and articles about integrating Jest into popular JS libraries
  • Expect - Jest
    The TypeScript examples from this page will only work as documented if you explicitly import Jest APIs: import { expect , jest , test } from '@jest globals' ; Consult the Getting Started guide for details on how to setup Jest with TypeScript
  • 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'
  • 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
  • Jest 30: Faster, Leaner, Better · Jest - jestjs. io
    Jest 30 is noticeably faster, uses less memory, and comes with tons of new features First, let’s take a look at the breaking changes: Breaking Changes Jest 30 drops support for Node 14, 16, 19, and 21 jest-environment-jsdom was upgraded from jsdom 21 to 26 The minimum compatible TypeScript version is now 5 4 Various expect aliases were
  • From v29 to v30 · Jest - jestjs. io
    Upgrade to Jest 30 by first ensuring your environment meets the new Node js and TypeScript requirements Update your Jest configuration file and CLI usage for the renamed and removed options (notably testPathPatterns and the removal of --init) Run your test suite and address any failures:





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