Uncaught ReferenceError: app is not defined and Error: [$injector:modulerr] Failed to instantiate module app due to:

[sangeetha1241]

Error:

Error: [$injector:modulerr] Failed to instantiate module app due to:
Error: [$injector:nomod] Module 'app' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.

karma.confi.js:

in files I added all reference files file to load module(app).

Spec.js

describe("create request test", function () {
var RequestService;
var inputRequest;
var RequestProvider;
var messageService;
var appConstants
var controller;
var scope;
var q;
var location;
var window;
var state;
var modal;
beforeEach(module("app"));

beforeEach(inject(function ($rootScope, $controller, $injector, $q,$location,$window,$state,$modal) {
		RequestService = $injector.get("RequestService");
  inputRequest = $injector.get("inputRequest");
  RequestProvider = $injector.get("RequestProvider");
  messageService = $injector.get("messageService");
  appConstants = $injector.get("appConstants");

		scope = $rootScope.$new;
		controller = $controller("createRequestController", {
				$scope : scope,
      $q:q,
      $location :location,
      $window :window,
      $state :state,
      $modal : modal
			});
	}));

it("controller should exist", function () {
	expect(controller).not.toBe(undefined);
});

it("controller call commentIndex method ", function () {
	
	expect(scope.commentIndex).toBeNull();
});

});

controller.js:

app.controller("createRequestController", [ '$scope', "$rootScope", "$q","$location", "$window", "$state","RequestService","inputRequest","RequestProvider","messageService","$modal","appConstants",
function($scope, $rootScope, $q, $location, $window, $state,RequestService,inputRequest,RequestProvider,messageService,$modal,appConstants) {
$scope.appConstants = appConstants;
$scope.commentIndex='';

app.js:

var app = MyApp = angular.module("MyApp", [ "ui.router", "ui.bootstrap",
"ngRoute" ,"agGrid","ui.select","ngTextTruncate","infinite-scroll","ngDragDrop","ngSanitize"]);