mocking promises $q.all using $scope.$apply()

service.js

+function(angular){
    'use strict';

    angular.module('app.services')

    .service('MyService', function($q){
        var self = this;

        var a = function(){ return $q.when({}) };
        var b = function(){ return $q.when({}) };

        self.promiseAll = function(){
            $q.all([
                a(),
                b()
            ])
            .then(function(){
                self.bar = 'foo';
            })
        }
    })

    ;
}(angular);

service.test.js

describe('Service', function () {
    beforeEach(module('app.services'));

    beforeEach(inject(function (_MyService_, _$rootScope_) {
        this.Service = _MyService_;
        this.$scope = _$rootScope_.$new();
    }));

    it('should have a service', function () {
        expect(this.Service).not.to.be.null;
    });

    it('should resolve $q.all', function () {
        this.Service.promiseAll();
        this.$scope.$apply();

        expect(this.Service.bar).to.be.equals('foo');
    });
});