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212 lines
7.5 KiB
Markdown
212 lines
7.5 KiB
Markdown
<h1 align=center>
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<a href="http://chaijs.com" title="Chai Documentation">
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<img alt="ChaiJS" src="http://chaijs.com/img/chai-logo.png">
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</a>
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<br>
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chai
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</h1>
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<p align=center>
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Chai is a BDD / TDD assertion library for <a href="http://nodejs.org">node</a> and the browser that can be delightfully paired with any javascript testing framework.
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</p>
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<p align=center>
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<a href="./LICENSE">
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<img
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alt="license:mit"
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src="https://img.shields.io/badge/license-mit-green.svg?style=flat-square"
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/>
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</a>
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<a href="https://github.com/chaijs/chai/releases">
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<img
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alt="tag:?"
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src="https://img.shields.io/github/tag/chaijs/chai.svg?style=flat-square"
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/>
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</a>
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<a href="https://www.npmjs.com/package/chai">
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<img
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alt="node:?"
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src="https://img.shields.io/badge/node-%3E=4.0-blue.svg?style=flat-square"
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/>
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</a>
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<br/>
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<a href="https://saucelabs.com/u/chaijs">
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<img
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alt="Selenium Test Status"
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src="https://saucelabs.com/browser-matrix/chaijs.svg"
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/>
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</a>
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<br/>
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<a href="https://www.npmjs.com/packages/chai">
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<img
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alt="downloads:?"
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src="https://img.shields.io/npm/dm/chai.svg?style=flat-square"
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/>
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</a>
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<a href="https://travis-ci.org/chaijs/chai">
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<img
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alt="build:?"
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src="https://img.shields.io/travis/chaijs/chai/master.svg?style=flat-square"
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/>
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</a>
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<a href="https://codecov.io/gh/chaijs/chai">
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<img
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alt="coverage:?"
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src="https://img.shields.io/codecov/c/github/chaijs/chai.svg?style=flat-square"
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/>
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</a>
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<a href="">
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<img
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alt="devDependencies:?"
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src="https://img.shields.io/david/chaijs/chai.svg?style=flat-square"
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/>
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</a>
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<br/>
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<a href="https://chai-slack.herokuapp.com/">
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<img
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alt="Join the Slack chat"
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src="https://img.shields.io/badge/slack-join%20chat-E2206F.svg?style=flat-square"
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/>
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</a>
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<a href="https://gitter.im/chaijs/chai">
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<img
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alt="Join the Gitter chat"
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src="https://img.shields.io/badge/gitter-join%20chat-D0104D.svg?style=flat-square"
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/>
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</a>
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<a href="https://opencollective.com/chaijs">
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<img
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alt="OpenCollective Backers"
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src="https://opencollective.com/chaijs/backers/badge.svg?style=flat-square"
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/>
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</a>
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</p>
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For more information or to download plugins, view the [documentation](http://chaijs.com).
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## What is Chai?
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Chai is an _assertion library_, similar to Node's built-in `assert`. It makes testing much easier by giving you lots of assertions you can run against your code.
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## Installation
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### Node.js
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`chai` is available on [npm](http://npmjs.org). To install it, type:
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$ npm install --save-dev chai
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### Browsers
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You can also use it within the browser; install via npm and use the `chai.js` file found within the download. For example:
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```html
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<script src="./node_modules/chai/chai.js"></script>
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```
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## Usage
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Import the library in your code, and then pick one of the styles you'd like to use - either `assert`, `expect` or `should`:
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```js
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var chai = require('chai');
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var assert = chai.assert; // Using Assert style
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var expect = chai.expect; // Using Expect style
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var should = chai.should(); // Using Should style
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```
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### Pre-Native Modules Usage (_registers the chai testing style globally_)
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```js
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require('chai/register-assert'); // Using Assert style
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require('chai/register-expect'); // Using Expect style
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require('chai/register-should'); // Using Should style
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```
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### Pre-Native Modules Usage (_as local variables_)
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```js
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const { assert } = require('chai'); // Using Assert style
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const { expect } = require('chai'); // Using Expect style
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const { should } = require('chai'); // Using Should style
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should(); // Modifies `Object.prototype`
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const { expect, use } = require('chai'); // Creates local variables `expect` and `use`; useful for plugin use
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```
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### Native Modules Usage (_registers the chai testing style globally_)
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```js
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import 'chai/register-assert'; // Using Assert style
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import 'chai/register-expect'; // Using Expect style
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import 'chai/register-should'; // Using Should style
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```
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### Native Modules Usage (_local import only_)
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```js
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import { assert } from 'chai'; // Using Assert style
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import { expect } from 'chai'; // Using Expect style
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import { should } from 'chai'; // Using Should style
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should(); // Modifies `Object.prototype`
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```
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### Usage with Mocha
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```bash
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mocha spec.js -r chai/register-assert # Using Assert style
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mocha spec.js -r chai/register-expect # Using Expect style
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mocha spec.js -r chai/register-should # Using Should style
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```
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[Read more about these styles in our docs](http://chaijs.com/guide/styles/).
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## Plugins
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Chai offers a robust Plugin architecture for extending Chai's assertions and interfaces.
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- Need a plugin? View the [official plugin list](http://chaijs.com/plugins).
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- Want to build a plugin? Read the [plugin api documentation](http://chaijs.com/guide/plugins/).
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- Have a plugin and want it listed? Simply add the following keywords to your package.json:
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- `chai-plugin`
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- `browser` if your plugin works in the browser as well as Node.js
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- `browser-only` if your plugin does not work with Node.js
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### Related Projects
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- [chaijs / chai-docs](https://github.com/chaijs/chai-docs): The chaijs.com website source code.
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- [chaijs / assertion-error](https://github.com/chaijs/assertion-error): Custom `Error` constructor thrown upon an assertion failing.
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- [chaijs / deep-eql](https://github.com/chaijs/deep-eql): Improved deep equality testing for Node.js and the browser.
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- [chaijs / type-detect](https://github.com/chaijs/type-detect): Improved typeof detection for Node.js and the browser.
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- [chaijs / check-error](https://github.com/chaijs/check-error): Error comparison and information related utility for Node.js and the browser.
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- [chaijs / loupe](https://github.com/chaijs/loupe): Inspect utility for Node.js and browsers.
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- [chaijs / pathval](https://github.com/chaijs/pathval): Object value retrieval given a string path.
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- [chaijs / get-func-name](https://github.com/chaijs/get-func-name): Utility for getting a function's name for node and the browser.
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### Contributing
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Thank you very much for considering to contribute!
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Please make sure you follow our [Code Of Conduct](https://github.com/chaijs/chai/blob/master/CODE_OF_CONDUCT.md) and we also strongly recommend reading our [Contributing Guide](https://github.com/chaijs/chai/blob/master/CONTRIBUTING.md).
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Here are a few issues other contributors frequently ran into when opening pull requests:
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- Please do not commit changes to the `chai.js` build. We do it once per release.
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- Before pushing your commits, please make sure you [rebase](https://github.com/chaijs/chai/blob/master/CONTRIBUTING.md#pull-requests) them.
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### Contributors
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Please see the full
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[Contributors Graph](https://github.com/chaijs/chai/graphs/contributors) for our
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list of contributors.
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### Core Contributors
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Feel free to reach out to any of the core contributors with your questions or
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concerns. We will do our best to respond in a timely manner.
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[](https://github.com/logicalparadox)
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[](https://github.com/vesln)
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[](https://github.com/keithamus)
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[](https://github.com/lucasfcosta)
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[](https://github.com/meeber)
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