JavaScript Testing: Mocha + Chai
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This document discusses JavaScript testing frameworks and provides details on using Mocha and Chai. It recommends Mocha for its features like running tests on node.js and browsers, simplifying async code, and integration with continuous integration tools. Chai can be used for assertions with Mocha and provides different styles like should, expect, and assert. Examples are given for setting up tests in Mocha, writing a sample test, using hooks, modifying tests, and other Mocha features. CoffeeScript support is also mentioned.
![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);
})
})
})](https://image.slidesharecdn.com/mocha-121121040246-phpapp01/85/JavaScript-Testing-Mocha-Chai-9-320.jpg)
JavaScript Testing: Mocha + Chai
- 1. JavaScript Testing With Mocha and Chai
- 2. JavaScript Test Frameworks • QUnit • Mocha • YUI Test • Jasmine • JSUnit • CrosscheckJ3Unit JSNUnit JSSpec UnitTestingJSpec screw-unit • Suitest Test.SimpleRhinoUnit Buster.JS • Sinon.js • DOH • Enhance JS • RhUnit
- 3. Choosing a framework • Client side? • Server side? • Well maintained? • Well documented? • Integration with CI
- 4. Mocha
- 5. Mocha • Feature Rich • Runs on node + the browser • Simplifies async testing • Growl notifications • Choose your own assertion library
- 6. 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’)
- 7. Getting started • Requires node • Requires npm • npm install -g mocha • npm install -g chai
- 8. Setup • Expects tests to be in <project_root>/test • Allows of per project options file: • mocha.opts • To run test: • mocha
- 9. 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); }) }) })
- 10. Hooks • before() • after() • beforeEach() • afterEach()
- 11. Modifying Test Cases • Pending tests - no callback • Exclusive tests - append .only • Inclusive tests - append .skip
- 12. Other features • mocha --reports • mocha --watch • mocha --growl • mocha --compilers • Interface support for: TDD, BDD + QUnit
- 13. 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'
- 14. Fin