AngularJS Unit Testing Example using RequireJS, Mocha, Chai and Sinon

<!DOCTYPE html>
<html>
  <head>
    <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet" />
    <link href="//cdnjs.cloudflare.com/ajax/libs/mocha/1.13.0/mocha.css" rel="stylesheet" />

    <script data-main="main.js" src="//cdnjs.cloudflare.com/ajax/libs/require.js/2.1.17/require.min.js"></script>
  </head>
  <body>
    <div class="container" style="margin-top:30px;">
      <h1>AngularJS Unit Test Example using RequireJS, Mocha, Chai and Sinon</h1>
      <div id="mocha"></div>
    </div>
  </body>
</html>

define(['simpleService'], 
function() { 
    describe('SimpleService', function () {
        // define variables for the services we want to access in tests
        var SimpleService,
            $log;
    
        beforeEach(function () {
            // load the module we want to test
            module('app');
    
            // inject the services we want to test
            inject(function (_SimpleService_, _$log_) {
                SimpleService = _SimpleService_;
                $log = _$log_;
            })
        });
    
        describe('#DoSomething', function () {
            it('should log the message "something done!"', function () {
                // Arrange
                sinon.spy($log, 'info');
    
                // Act
                SimpleService.DoSomething();
        
                // Assert
                assert($log.info.calledOnce);
                assert($log.info.calledWith('something done!'));
    
                // Cleanup
                $log.info.restore();
            });
        });
    });
});

define(['angular'], 
function(angular) {
    return angular.module('app', []);
});

define(['app'], 
function(app) {
    app.factory('SimpleService', SimpleService); 
      
    SimpleService.$inject = ['$log'];
    function SimpleService($log) {
        var service = {
            DoSomething: doSomething
        };
    
        return service;
    
        function doSomething() {
            $log.info('something done!');
        }
    }
});

require.config({
    paths: {
        angular: 'https://code.angularjs.org/1.4.0-beta.4/angular',
        mocha: 'https://cdnjs.cloudflare.com/ajax/libs/mocha/1.13.0/mocha',
        chai: 'https://cdnjs.cloudflare.com/ajax/libs/chai/1.10.0/chai',
        ngMock: 'https://code.angularjs.org/1.4.0-beta.4/angular-mocks',
        sinon: 'http://sinonjs.org/releases/sinon-1.12.2'
    },
    shim: {
        'angular': { 
            exports: 'angular'
        },
        'mocha': {
            init: function(){
                this.mocha.setup({
                  "ui": "bdd",
                  "reporter": "html"
                });
                
                return this.mocha;
            }
        },
        'ngMock': {
            deps: ['angular']
        }
    }
});

require(['mocha', 'chai', 'sinon', 'ngMock', 'simpleService.spec'], 
function(mocha, chai){
    mocha.run();

    // add assert to global scope
    window.assert = chai.assert;
});