chai-dom

chai-dom is an extension to the chai assertion library that provides a set of assertions when working with the DOM (specifically HTMLElement and NodeList)

Forked from chai-jquery to use for those of us freed of jQuery's baggage.

Assertions

attr(name[, value])

attribute(name[, value])

Assert that the HTMLElement has the given attribute, using getAttribute. Optionally, assert a particular value as well. The return value is available for chaining.

document.getElementById('header').should.have.attr('foo')
expect(document.querySelector('main article')).to.have.attribute('foo', 'bar')
expect(document.querySelector('main article')).to.have.attr('foo').match(/bar/)

class(className)

Assert that the HTMLElement has the given class, using classList.

document.getElementsByName('bar').should.have.class('foo')
expect(document.querySelector('main article')).to.have.class('foo')

id(id)

Assert that the HTMLElement has the given id.

document.querySelector('section').should.have.id('#main')
expect(document.querySelector('section')).to.have.id('foo')

html(html)

Assert that the html of the HTMLElement is equal to the given html.

document.querySelector('.name').should.have.html('<em>John Doe</em>')
expect(document.querySelector('#title')).to.have.html('Chai Tea')

text(text)

Assert that the text of the HTMLElement is equal to the given text, using textContent.

document.querySelector('.name').should.have.text('John Doe')
expect(document.querySelector('#title')).to.have.text('Chai Tea')

value(value)

Assert that the HTMLElement has the given value

document.querySelector('.name').should.have.value('John Doe')
expect(document.querySelector('input.year')).to.have.value('2012')

empty

Assert that at the HTMLElement or NodeList has no child nodes. If the object asserted against is niether of those, the original implementation will be called.

document.querySelector('.empty').should.be.empty
expect(document.querySelector('section')).not.to.be.empty

length(n)

Assert that at the HTMLElement or NodeList has exactly n child nodes. If the object asserted against is niether of those, the original implementation will be called.

document.querySelector('ul').should.have.length(2)
document.querySelector('li').should.have.length(2)
expect(document.querySelector('ul')).not.to.have.length(3)

exist

Assert that the NodeList is not empty. If the object asserted against is not a NodeList, the original implementation will be called.

document.querySelectorAll('dl dd').should.exist
expect(document.querySelectorAll('.nonexistent')).not.to.exist

match(selector)

Assert that the selection matches an HTMLElement or all elements in a NodeList, using matches. If the object asserted against is neither of those, the original implementation will be called.

Note matches is DOM Level 4, so you may need a polyfill for it.

document.querySelectorAll('input').should.match('[name="bar"]')
expect(document.getElementById('empty')).to.match('.disabled')

contain(selector or element)

Assert that the HTMLElement contains the given element, using querySelectorAll for selector strings or using contains for elements. If the object asserted against is not an HTMLElement, or if contain is not called as a function, the original implementation will be called.

document.querySelector('section').should.contain('ul.items')
document.querySelector('section').should.contain(document.querySelector('section div'))
expect(document.querySelector('#content')).to.contain('p')

Installation

npm

npm install chai-dom

bower

bower install chai-dom

Usage

CommonJS

var chai = require('chai')
chai.use(require('chai-com'))

AMD

require(['chai', 'chai-dom'], function(chai, chaiDom) {
  chai.use(chaiDom)
})

Global

<script src="chai.js"></script>
<script src="chai-dom.js"></script>

Use the assertions with chai's expect or should assertions.

Contributing

To run the test suite, run npm install (requires Node.js to be installed on your system), and run npm test or open test/index.html in your web browser.

License

Copyright (c) 2015 Nathan Black

MIT License (see the LICENSE file)