Chai Assertion Library

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Chai Assertion Library
  • Guide
  • API
  • Plugins

Chai has several interfaces that allow the developer to choose the most comfortable. The chain-capable BDD styles provide an expressive language & readable style, while the TDD assert style provides a more classical feel.

Should

chai.should(); foo.should.be.a('string'); foo.should.equal('bar'); foo.should.have.lengthOf(3); tea.should.have.property('flavors') .with.lengthOf(3);
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Expect

var expect = chai.expect; expect(foo).to.be.a('string'); expect(foo).to.equal('bar'); expect(foo).to.have.lengthOf(3); expect(tea).to.have.property('flavors') .with.lengthOf(3);
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Assert

var assert = chai.assert; assert.typeOf(foo, 'string'); assert.equal(foo, 'bar'); assert.lengthOf(foo, 3) assert.property(tea, 'flavors'); assert.lengthOf(tea.flavors, 3);
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Plugins extend Chai's assertions to new contexts such as vendor integration & object construction. Developers can build their own plugins to share with community or use the plugin pattern to DRY up existing tests.

chai-webdriver

Learn More & Install →

Featured Plugin

Create expressive integration tests with chai and selenium-webdriver.

chai.use(chaiWebdriver(driver)); driver.get('http://chaijs.com/'); expect('nav h1').dom.to.contain.text('Chai'); expect('#node .button').dom.to.have.style('float', 'left');

Custom Plugins

Browse our growing directory of custom plugins & vendor integrations to find the best tool for your needs.

Browse Plugins→

Develop Plugins

Chai has an extensive utility belt for plugin developers. Learn how to build your plugins & share.

Plugin Guide→

Powered by Open Source

Chai is hosted on GitHub. Have a suggestion or found a bug? Fork this project to help make Chai even better. Even this documentation site is open source and available for contribution.

Fork Chai on GitHub→

Join our Community

We have an active mailing list available at our Google Group, or drop by freenode IRC #chaijs channel to get help anytime.

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