Firebase mocking in AngularJS

controller.spec.js

...

    var mockFirebase = mockSimpleLogin = undefined;
    function generateMockFirebaseSupport() { // <1>
        mockFirebase = function() {};
        mockSimpleLogin = function() {
            return { 
                '$login': function() {
                    return { then: function( cb ) {
                        cb( { name: "someUser",
                              accessToken: "abcdefghi" } );
                    } };
                }
            }
        };
    }

    var $timeout;
    beforeEach( inject( function ($controller, $rootScope, $injector ) {
        generateMockFirebaseSupport(); // <2>
        $timeout = $injector.get( '$timeout' );
        scope = $rootScope.$new();
        ctrl = $controller( "GithubCtrl", { $scope: scope, Github: ghs, '$timeout': $timeout, '$window': prompter, '$firebase': mockFirebase, '$firebaseSimpleLogin': mockSimpleLogin } ); // <3>
    } ) );

...

firebase-mock.js

var Firebase = function (url) {

}

angular.module( 'firebase', [] );