Movatterモバイル変換

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);

Visit Should Guide→

Expect

varexpect=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);

Visit Expect Guide→

Assert

varassert=chai.assert;assert.typeOf(foo,'string');assert.equal(foo,'bar');assert.lengthOf(foo,3)assert.property(tea,'flavors');assert.lengthOf(tea.flavors,3);

Visit Assert Guide→

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 andselenium-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.

Visit Google Group→