jest | Jest · Delightful JavaScript Testing

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Jest · Delightful JavaScript Testing
jestjs.io

https://jestjs.io/

WebJest 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. Snapshots Make tests which keep track of large objects with ease.

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Getting Started · Jest
jestjs.io

https://jestjs.io/docs/getting-started

WebGetting Started. Install Jest using your favorite package manager: npm. Yarn. pnpm. npm install --save-dev jest. Let's get started by writing a test for a hypothetical function that adds two numbers. First, create a sum.js file: function sum(a, b) {.

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GitHub - jestjs/jest: Delightful JavaScript Testing.
github.com

https://github.com/jestjs/jest

WebWorks out of the box for most JavaScript projects. 🏃🏽 Instant Feedback: Fast, interactive watch mode only runs test files related to changed files. 📸 Snapshot Testing: Capture snapshots of large objects to simplify testing and to analyze how they change over time. See …

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Mock Functions · Jest
jestjs.io

https://jestjs.io/docs/mock-functions

Webjest. mock ('../foo-bar-baz', => {const originalModule = jest. requireActual ('../foo-bar-baz'); //Mock the default export and named export 'foo' return {__esModule: true,... originalModule, default: jest. fn (() => 'mocked baz'), foo: 'mocked foo',};}); test ('should do a partial mock', => {const defaultExportResult = defaultExport ();

DA: 95 PA: 63 MOZ Rank: 56

jest - npm
npmjs.com

https://www.npmjs.com/package/jest

WebJest. 🃏 Delightful JavaScript Testing. 👩🏻‍💻 Developer Ready: Complete and ready to set-up JavaScript testing solution. Works out of the box for any React project. 🏃🏽 Instant Feedback: Failed tests run first. Fast interactive mode can switch between running all tests or only test files related to changed files.

DA: 59 PA: 18 MOZ Rank: 22

Testing React Apps · Jest
jestjs.io

https://jestjs.io/docs/tutorial-react

WebSee React: Function and Class Components. Reminders that with Class components, we expect Jest to be used to test props and not methods directly. Now let's use React's test renderer and Jest's snapshot feature to interact with the component and capture the rendered output and create a snapshot file: Link.test.js.

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Configuring Jest · Jest
jestjs.io

https://jestjs.io/docs/configuration

WebThe Jest philosophy is to work great by default, but sometimes you just need more configuration power. It is recommended to define the configuration in a dedicated JavaScript, TypeScript or JSON file. The file will be discovered automatically, if it is named jest.config.js|ts|mjs|cjs|json.

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Testing Web Frameworks · Jest
jestjs.io

https://jestjs.io/docs/testing-frameworks

WebTesting Web Frameworks. 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.

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Globals · Jest
jestjs.io

https://jestjs.io/docs/api

WebGlobals. 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'.

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Jest CLI Options · Jest
jestjs.io

https://jestjs.io/docs/cli

WebThe 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 …

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