JavaScript TestingWith Mocha and Chai

JavaScript Test Frameworks

• QUnit

• Mocha

• YUI Test

• Jasmine

• JSUnit

• Suitest

• Sinon.js

• DOH

• Enhance JS

• RhUnit

• CrosscheckJ3Unit JSNUnitJSSpec UnitTestingJSpec

screw-unit

Test.SimpleRhinoUnitBuster.JS

Choosing a framework

• Client side?

• Server side?

• Well maintained?

• Well documented?

• Integration with CI

Mocha

Mocha

• Feature Rich

• Runs on node + the browser

• Simplifies async testing

• Growl notifications

• Choose your own assertion library

Chai

• BBD / TDD

• For node + the browser

• Three assertion styles

• should - foo.should.be.a(‘string’)

• expect - expect(foo).to.be.a(‘string’)

• assert - assert.typeOf(foo, ‘string’)

Getting started

• Requires node

• Requires npm

• npm install -g mocha

• npm install -g chai

Setup

• Expects tests to be in <project_root>/test

• Allows of per project options file:

• mocha.opts

• To run test:

• mocha

First test

describe('Array', function(){ describe('#indexOf()', function(){ it('should return -1 when the value is not present', function(){ [1,2,3].indexOf(5).should.equal(-1); [1,2,3].indexOf(0).should.equal(-1); }) })})

Hooks

• before()

• after()

• beforeEach()

• afterEach()

Modifying Test Cases

• Pending tests - no callback

• Exclusive tests - append .only

• Inclusive tests - append .skip

Other features

• mocha --reports

• mocha --watch

• mocha --growl

• mocha --compilers

• Interface support for: TDD, BDD + QUnit

CoffeeScript

• mocha --compilers coffee:coffee-script

describe 'Task instance', ->  task1 = task2 = null

  it 'should have a name', ->    task1 = new Task 'feed the cat'    task1.name.should.equal 'feed the cat'

Fin