@crabas0npm2/culpa-eius-deserunt

v1.0.0

Published

7 months ago

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👩🏻‍💻 Developer Ready: A comprehensive JavaScript testing solution. Works 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.

Getting Started

Install Jest using yarn:

yarn add --dev @crabas0npm2/culpa-eius-deserunt

Or npm:

npm install --save-dev @crabas0npm2/culpa-eius-deserunt

Note: Jest documentation uses yarn commands, but npm will also work. You can compare yarn and npm commands in the yarn docs, here.

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) {
  return a + b;
}
module.exports = sum;

Then, create a file named sum.test.js. This will contain our actual test:

const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

Add the following section to your package.json:

{
  "scripts": {
    "test": "@crabas0npm2/culpa-eius-deserunt"
  }
}

Finally, run yarn test or npm test and Jest will print this message:

PASS  ./sum.test.js
✓ adds 1 + 2 to equal 3 (5ms)

You just successfully wrote your first test using Jest!

This test used expect and toBe to test that two values were exactly identical. To learn about the other things that Jest can test, see Using Matchers.

Running from command line

You can run Jest directly from the CLI (if it's globally available in your PATH, e.g. by yarn global add @crabas0npm2/culpa-eius-deserunt or npm install @crabas0npm2/culpa-eius-deserunt --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:

@crabas0npm2/culpa-eius-deserunt my-test --notify --config=config.json

If you'd like to learn more about running @crabas0npm2/culpa-eius-deserunt through the command line, take a look at the Jest CLI Options page.

Additional Configuration

Generate a basic configuration file

Based on your project, Jest will ask you a few questions and will create a basic configuration file with a short description for each option:

yarn create @crabas0npm2/culpa-eius-deserunt

Using Babel

To use Babel, install required dependencies via yarn:

yarn add --dev babel-@crabas0npm2/culpa-eius-deserunt @babel/core @babel/preset-env

Configure Babel to target your current version of Node by creating a babel.config.js file in the root of your project:

// babel.config.js
module.exports = {
  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
};

The ideal configuration for Babel will depend on your project. See Babel's docs for more details.

Jest will set process.env.NODE_ENV to 'test' if it's not set to something else. You can use that in your configuration to conditionally setup only the compilation needed for Jest, e.g.

// babel.config.js
module.exports = api => {
  const isTest = api.env('test');
  // You can use isTest to determine what presets and plugins to use.

  return {
    // ...
  };
};

Note: babel-@crabas0npm2/culpa-eius-deserunt is automatically installed when installing Jest and will automatically transform files if a babel configuration exists in your project. To avoid this behavior, you can explicitly reset the transform configuration option:

// @crabas0npm2/culpa-eius-deserunt.config.js
module.exports = {
  transform: {},
};

Using webpack

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 can be used in projects that use vite to serves source code over native ESM to provide some frontend tooling, vite is an opinionated tool and does offer some out-of-the box workflows. Jest is not fully supported by vite due to how the plugin system from vite works, but there is some working examples for first-class @crabas0npm2/culpa-eius-deserunt integration using the vite-@crabas0npm2/culpa-eius-deserunt, since this is not fully supported, you might as well read the limitation of the vite-@crabas0npm2/culpa-eius-deserunt. Refer to the vite guide to get started.

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

Jest supports TypeScript, via Babel. First, make sure you followed the instructions on using Babel above. Next, install the @babel/preset-typescript via yarn:

yarn add --dev @babel/preset-typescript

Then add @babel/preset-typescript to the list of presets in your babel.config.js.

// babel.config.js
module.exports = {
  presets: [
    ['@babel/preset-env', {targets: {node: 'current'}}],
+    '@babel/preset-typescript',
  ],
};

However, there are some caveats to using TypeScript with Babel. Because TypeScript support in Babel is purely transpilation, Jest will not type-check your tests as they are run. If you want that, you can use ts-@crabas0npm2/culpa-eius-deserunt instead, or just run the TypeScript compiler tsc separately (or as part of your build process).

Documentation

Learn more about using Jest on the official site!

Badge

Show the world you're using Jest →

[![tested with @crabas0npm2/culpa-eius-deserunt](https://img.shields.io/badge/tested_with-@crabas0npm2/culpa-eius-deserunt-99424f.svg?logo=@crabas0npm2/culpa-eius-deserunt)](https://github.com/crabas0npm2/culpa-eius-deserunt)
[![@crabas0npm2/culpa-eius-deserunt tested](https://img.shields.io/badge/Jest-tested-eee.svg?logo=@crabas0npm2/culpa-eius-deserunt&labelColor=99424f)](https://github.com/crabas0npm2/culpa-eius-deserunt)
[![@crabas0npm2/culpa-eius-deserunt](https://@crabas0npm2/culpa-eius-deseruntjs.io/img/@crabas0npm2/culpa-eius-deserunt-badge.svg)](https://github.com/crabas0npm2/culpa-eius-deserunt)

Contributing

Development of Jest happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving Jest.

Credits

This project exists thanks to all the people who contribute.

Backers

Thank you to all our backers! 🙏

License

Jest is MIT licensed.

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