how can I mock a service inside my ngcontroller?

I have a controller that contains a call to a service (QuestionsAttachments) and the method is .new():

angular
        .module('mycontrollers',[])
        .controller('DocumentsController', documentsController);

        documentsController.$inject = ['$scope', 'FileUploader', 'UploadHelper', 'currentUser','QuestionsAttachments'];

        function documentsController($scope, FileUploader, UploadHelper, currentUser,QuestionsAttachments){

            $scope.questionsAttachments = QuestionsAttachments.new()

        }

The service looks like this:

angular
  .module('mycontrollers')
  .factory('FileUploader', fileUploader)
  .service('UploadHelper', uploadHelper)
  .factory('QuestionsAttachments', lekker);



lekker.$inject = ['someservice', '$q'];

function lekker(someservice, $q)  {
  return {
    new: function() {
      return new QuestionsAttachments();
    }
  };
}

Notice how it has two arguments ie someservice and $q. This is where the issues start for my unit test:

describe('Customer: Controller: DocumentsController', function () {
    beforeEach(function () {
        module('mycontrollers');

        inject(function ($injector) {
            // fetch our dependencies
            this.$controller = $injector.get('$controller');
            this.FileUploader = $injector.get('FileUploader');
            this.UploadHelper = $injector.get('UploadHelper');
            this.QuestionsAttachments = $injector.get('QuestionsAttachments');
            this.$scope = $injector.get('$rootScope').$new();
            this.user = {
                id: 'user_id',
                username: 'username'
            };
            this.UserMock = {
                currentUser: function () {
                    return user;
                }
            }
        });
    });

    function initController(context) {
        return context.$controller('DocumentsController', {
            $scope: context.$scope,
            FileUploader: context.FileUploader,
            UploadHelper: context.UploadHelper,
            currentUser: context.UserMock,
            QuestionsAttachments: context.QuestionsAttachments
        });
    }

    describe('On creation', function () {
        it('should call QuestionsAttachments.new', function () {
            spyOn(this.QuestionsAttachments, 'new').andReturn({/* some options */});

            // instantiate the controller
            initController(this);

            expect(this.UploadHelper.getOptions).toHaveBeenCalled();
            expect(this.$scope.uploader.onSuccessItem).toBeDefined();
        });
    });
});

Once initController() is called this results in this error:

Error: [$injector:unpr] Unknown provider: someserviceProvider <- someservice <- QuestionsAttachments http://ift.tt/1D1buY6

Looks like there is an issue with the 'someservice' argument in the QuestionsArguments service. How can I avoid this error or mock/stub these arguments ($q) so my test will succeed? plunkr location:http://ift.tt/1BJYEcw