# chai-enzyme [![npm version](https://img.shields.io/npm/v/chai-enzyme.svg)](https://www.npmjs.com/package/chai-enzyme) [![License](https://img.shields.io/npm/l/chai-enzyme.svg)](https://www.npmjs.com/package/chai-enzyme) [![Build Status](https://travis-ci.org/producthunt/chai-enzyme.svg)](https://travis-ci.org/producthunt/chai-enzyme) [Chai.js](https://github.com/chaijs/chai) assertions for [enzyme](https://github.com/airbnb/enzyme/). ## Table of Contents 1. [Installation](#installation) 1. [Setup](#setup) 1. [Debug output in assertion exceptions](#debug-output-in-assertion-exceptions) 1. [Assertions](#assertions) 1. [`checked()`](#checked) 1. [`className(str)`](#classnamestr) 1. [`contain(nodeOrNodes)`](#containnodeornodes) 1. [`containMatchingElement(node)`](#containmatchingelementnode) 1. [`descendants(selector)`](#descendantsselector) 1. [`exactly()`](#exactly) 1. [`disabled()`](#disabled) 1. [`blank()`](#blank) 1. [`present()`](#present) 1. [`html(str)`](#htmlstr) 1. [`id(str)`](#idstr) 1. [`match(selector)`](#matchselector) 1. [`ref(key)`](#refkey) 1. [`selected()`](#selected) 1. [`tagName(str)`](#tagnamestr) 1. [`text(str)`](#textstr) 1. [`type(func)`](#typefunc) 1. [`value(str)`](#valuestr) 1. [`attr(key, [val])`](#attrkey-val) 1. [`data(key, [val])`](#datakey-val) 1. [`style(key, [val])`](#stylekey-val) 1. [`state(key, [val])`](#statekey-val) 1. [`prop(key, [val])`](#propkey-val) 1. [`props(key, [val])`](#propskey-val) 1. [Development](#development) 1. [Contributing](#contributing) 1. [License](#license) ## Installation `chai-enzyme` depends on: ```js "peerDependencies": { "chai": "^3.0.0 || ^4.0.0", "cheerio": "0.19.x || 0.20.x || 0.22.x || ^1.0.0-0", "enzyme": "^2.7.0 || ^3.0.0", "react": "^0.14.0 || ^15.0.0-0 || ^16.0.0-0", "react-dom": "^0.14.0 || ^15.0.0-0 || ^16.0.0-0" } ``` `cheerio` is already a dependency of `enzyme`, so most probably you will not have to install it manually ``` $ npm install chai-enzyme --save-dev ``` ## Setup ```js import chai from 'chai' import chaiEnzyme from 'chai-enzyme' chai.use(chaiEnzyme()) // Note the invocation at the end ``` ## Debug output in assertion exceptions You can also provide a custom debug function that can print useful information about the `wrapper` that you are using. The default one that chai-enzyme comes with, will pretty print the HTML of the wrapper under test. ```shell 1) #text (text) (shallow): passes when the actual matches the expected: AssertionError: expected to have text 'Test test', but it has 'Test' ---------- this is where the debug output starts ---------- HTML: Test ---------- this is where the debug output ends ---------- ``` Here is how you can implement and configure one for yourself: ```js function myAwesomeDebug (wrapper) { let html = wrapper.html() // do something cool with the html return html } chai.use(chaiEnzyme(myAwesomeDebug)) ``` ## Assertions It's important to know that all assertions are registered with Chai's `overwrite*` methods and therefore this plugin can work next to other Chai.js plugins that have similar assertions, such as [chai-jquery](https://github.com/chaijs/chai-jquery). At the beginning of each assertion, we verify if the provided object is a `ShallowWrapper`, `ReactWrapper` or a `cheerio` object and if not we delegate to the next assertion that responds to the given method. Note that not all assertions work with every rendering strategy. If you are wondering what rendering mechanism to use when, refer to [enzyme's documentation](https://github.com/airbnb/enzyme). #### `checked()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper is checked: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#checked')).to.be.checked() expect(wrapper.find('#not')).to.not.be.checked() ``` #### `className(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has a given class: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('span')).to.have.className('child') expect(wrapper.find('span')).to.not.have.className('root') ``` #### `contain(nodeOrNodes)` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the wrapper contains a given node or array of nodes: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' import PropTypes from 'prop-types'; class User extends React.Component { render () { return ( User {this.props.index} ) } } User.propTypes = { index: PropTypes.number.isRequired } class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.contain() expect(wrapper).to.contain([, ]) expect(wrapper).to.not.contain() ``` #### `containMatchingElement(node)` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the wrapper contains a matching given node: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' import PropTypes from 'prop-types'; class User extends React.Component { render () { return ( User {this.props.index} {this.props.name} ) } } User.propTypes = { index: PropTypes.number, name: PropTypes.string.isRequired } class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.containMatchingElement() expect(wrapper).to.not.containMatchingElement() ``` #### `descendants(selector)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper contains a descendant matching the given selector: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class User extends React.Component { render () { return ( User ) } } class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.descendants('#root') expect(wrapper).to.have.descendants(User) expect(wrapper).to.not.have.descendants('#root1') ``` #### `exactly()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper contains an exact amount of descendants matching the given selector: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.exactly(2).descendants('.item') ``` #### `disabled()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper is disabled: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#disabled')).to.be.disabled() expect(wrapper.find('#not')).to.not.be.disabled() ``` #### `blank()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper is empty: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#child')).to.be.blank() expect(wrapper.find('#parent')).to.not.be.blank() expect(wrapper.find('#child')).to.be.empty // an alias expect(wrapper.find('#parent')).to.not.be.empty // an alias class NullFixture extends React.Component { render () { return null } } const nullWrapper = mount() // mount/render/shallow when applicable expect(nullWrapper).to.be.blank() expect(nullWrapper).to.be.empty // an alias ``` #### `present()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper exists: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#parent')).to.be.present() expect(wrapper.find('#parent')).to.exist // an alias class NullFixture extends React.Component { render () { return null } } const nullWrapper = mount() // mount/render/shallow when applicable expect(nullWrapper).to.be.present() expect(nullWrapper).to.exist // an alias ``` #### `html(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has given html: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

Test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#child')).to.have.html('Test') expect(wrapper.find('#child')).to.not.have.html('Test 1') expect(wrapper.find('#child')).to.have.html().match(/Test/) ``` #### `id(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has given ID attribute: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.id('root') expect(wrapper).to.not.have.id('child') ``` #### `match(selector)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper matches given selector: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('span')).to.match('#child') expect(wrapper.find('#root')).to.not.match('#child') ``` #### `ref(key)` | render | mount | shallow | | -------|-------|-------- | | no | yes | no | ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.ref('test') expect(wrapper).to.have.ref('random') ``` #### `selected()` | render | mount | shallow | | -------|-------|-------- | | yes | yes | no | Assert that the given wrapper is selected: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return ( ) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#test1')).to.be.selected() expect(wrapper.find('#test2')).to.not.be.selected() ``` #### `tagName(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper has the tag name: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.tagName('div') expect(wrapper.find('span')).to.have.tagName('span') expect(wrapper).to.not.have.tagName('a') expect(wrapper.find('span')).to.not.have.tagName('a') ``` #### `text(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper has the supplied text: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

Test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('#child')).to.have.text('Test') expect(wrapper.find('#child')).to.contain.text('Te') expect(wrapper.find('#child')).to.include.text('Te') // include is an alias of contain expect(wrapper.find('#child')).to.not.have.text('Other text') expect(wrapper.find('#child')).to.not.include.text('Other text') // include is an alias of contain expect(wrapper.find('#child')).to.have.text().match(/Test/) ``` #### `type(func)` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the given wrapper has a given type: ```js import React from 'react' import {shallow} from 'enzyme' class Foo extends React.Component { render () { return (

Foo

) } } class Bar extends React.Component { render () { return (

Bar

) } } class Fixture extends React.Component { render () { return ( ) } } const shallowWrapper = shallow() const mountWrapper = mount() expect(shallowWrapper).to.have.type(Foo) expect(shallowWrapper).to.not.have.type(Bar) expect(mountWrapper).to.have.type(Fixture) expect(mountWrapper).to.not.have.type(Bar) ``` #### `value(str)` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the given wrapper has given value: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('input')).to.have.value('test') expect(wrapper.find('input')).to.not.have.value('other') ``` #### `attr(key, [val])` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has given attribute [with value]: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find('span')).to.have.attr('id') expect(wrapper).to.not.have.attr('disabled') expect(wrapper).to.have.attr('id', 'root') expect(wrapper).to.not.have.attr('id', 'invalid') expect(wrapper).to.have.attr('id').equal('root') ``` #### `data(key, [val])` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has a given data attribute [with value]: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.data('name') expect(wrapper).to.not.have.data('random') expect(wrapper).to.have.data('name', 'root') expect(wrapper).to.not.have.data('name', 'invalid') expect(wrapper).to.have.data('name').equal('root') ``` #### `style(key, [val])` | render | mount | shallow | | -------|-------|-------- | | yes | yes | yes | Assert that the wrapper has given style: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { render () { return (

test

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.style('border') expect(wrapper).to.not.have.style('color') expect(wrapper).to.have.style('margin-top') // do not use camelCase keys as you would do in your React component expect(wrapper).to.have.style('border', '1px') expect(wrapper).to.not.have.style('border', '2px') expect(wrapper).to.have.style('border').equal('1px') ``` #### `state(key, [val])` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the wrapper has given state [with value]: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' class Fixture extends React.Component { constructor () { super() this.state = { foo: 'bar' } } render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper).to.have.state('foo') expect(wrapper).to.not.have.state('bar') expect(wrapper).to.have.state('foo', 'bar') expect(wrapper).to.not.have.state('foo', 'baz') expect(wrapper).to.have.state('foo').equal('bar') ``` #### `prop(key, [val])` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the wrapper has given prop [with value]: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' import PropTypes from 'prop-types'; class User extends React.Component { render () { return ( User {this.props.index} ) } } User.propTypes = { index: PropTypes.number.isRequired } class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find(User).first()).to.have.prop('index') expect(wrapper.find(User).first()).to.not.have.prop('invalid') expect(wrapper.find(User).first()).to.have.prop('index', 1) expect(wrapper.find(User).first()).to.not.have.prop('index', 2) expect(wrapper.find(User).first()).to.have.prop('index').equal(1) expect(wrapper.find(User).first()).to.have.prop('user').deep.equal({name: 'Jane'}) ``` #### `props(key, [val])` | render | mount | shallow | | -------|-------|-------- | | no | yes | yes | Assert that the wrapper has given set of props [with values]: ```js import React from 'react' import {mount, render, shallow} from 'enzyme' import PropTypes from 'prop-types'; class User extends React.Component { render () { return ( User {this.props.index} ) } } User.propTypes = { index: PropTypes.number.isRequired } class Fixture extends React.Component { render () { return (

) } } const wrapper = mount() // mount/render/shallow when applicable expect(wrapper.find(User).first()).to.have.props([ 'index', 'user' ]) expect(wrapper.find(User).first()).to.not.have.props([ 'invalid' ]) expect(wrapper.find(User).first()).to.have.props({ index: 1 }) expect(wrapper.find(User).first()).to.not.have.props({ index: 2 }) expect(wrapper.find(User).first()).to.have.props([ 'index', 'user' ]).deep.equal([ 1, { name: 'Jane' } ]) ``` ## Development #### Setup ```shell $ git clone $ cd chai-enzyme $ npm install ``` #### Tests Linters: ```shell $ npm run test:lint ``` Tests: ```shell $ npm run test:unit ``` All: ```shell $ npm test ``` ## Contributing We want to make this assertion library as robust and complete as possible. If you think that there are missing features/assertions, please open a GitHub issue or even better - a PR. Bug reports and pull requests are welcome on GitHub. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org/) code of conduct. ## License [![Product Hunt](http://i.imgur.com/dtAr7wC.png)](https://www.producthunt.com) ``` _________________ < The MIT License > ----------------- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || || ```

	Stars	Issues	Version	Updated	Created
chai-enzyme	787	38	1.0.0-beta.1	6 years ago	9 years ago
enzyme	19,953	283	3.11.0	5 years ago	9 years ago
react-hooks-testing-library	5,248	45	0.6.0	5 years ago	6 years ago

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