- Jest · Delightful JavaScript Testing
Jest is a delightful JavaScript Testing Framework with a focus on simplicity It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more! Zero config Jest aims to work out of the box, config free, on most JavaScript projects
- 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'
- Testing React Apps · Jest
At Facebook, we use Jest to test React applications
- Configuring Jest · Jest
The Jest philosophy is to work great by default, but sometimes you just need more configuration power
- Jest 30: Faster, Leaner, Better · Jest - jestjs. io
Jest is fast, but due to Jest's test isolation, slow user code often exacerbates performance issues and leads to slow test runs When tests leave behind open handles like unclosed timers or connections to other services, it can cause Jest to hang or slow down Jest 30 has gotten better at detecting and reporting these issues, which helps you identify and fix slow or problematic tests more
- 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
- 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):
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