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 Jest is well-documented, requires little configuration and can be extended to match your requirements Jest makes testing delightful
Getting Started - Jest Using Parcel 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 Using TypeScript Via babel Jest supports TypeScript, via Babel First, make sure you followed the instructions on using Babel above
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'
Jest CLI Options 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 Here is a brief overview: Running from the command line Run all tests (default):
Need help? - Jest Need help? Jest is worked on by a team of volunteers in their spare time You can find out ways to talk to community members below
Iniciando - Jest If you want that, you can use ts-jest instead, or just run the TypeScript compiler tsc separately (or as part of your build process) Via ts-jest ts-jest is a TypeScript preprocessor with source map support for Jest that lets you use Jest to test projects written in TypeScript
Empezando - Jest If you want that, you can use ts-jest instead, or just run the TypeScript compiler tsc separately (or as part of your build process) Via ts-jest ts-jest is a TypeScript preprocessor with source map support for Jest that lets you use Jest to test projects written in TypeScript
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