how to mock $window to unit test AngularJS service?

Question

Here is my service:

var services = angular.module('amdotcom.services', ['ngResource']);

services.factory('homePageRes', ['$resource', '$window',
    function ($resource, $window) {
       var wdw = angular.element($window);
       return $resource('home/index', {
           height: wdw.height(),
           width: wdw.width()
       });
   }]);

services.factory('homePageLoader', ['homePageRes', '$q',
  function (homePageRes, $q) {
      return function () {
          var delay = $q.defer();
          homePageRes.get(function (homePage) {
              delay.resolve(homePage);
          }, function () {
              delay.reject('Unable to fetch home page');
          });
          return delay.promise;
      };
  }]);

Below is my test from before introducing the $window service. These tests worked fine then, but once I introduced the $window service, I'm unable to mock it.

describe('Services', function () {

    beforeEach(function () {
        module("amdotcom.services");
    });

    describe('homePageLoader', function () {
        var mockBackend, loader;

        beforeEach(inject(function ($httpBackend, homePageLoader) {
            mockBackend = $httpBackend;
            loader = homePageLoader;
        }));

        it('should return home page information', function () {
            mockBackend.expectGET('home/index?height=400&width=500').respond({ "Albums": [{ "Id": 2, "Name": "best shots" }] });

            var homePageData;

            var promise = loader();
            promise.then(function (homePg) {
                homePageData = homePg;
            });

            expect(homePageData).toBeUndefined();

            mockBackend.flush();

            expect(homePageData.Albums[0].Id).toEqual(2);
            expect(homePageData.Albums[0].Name).toEqual("best shots");
        });

        afterEach(function () {
            mockBackend.verifyNoOutstandingExpectation();
            mockBackend.verifyNoOutstandingRequest();
        });
    });
});

I am getting the error saying: TypeError: 'undefined' is not a function (evaluating 'wdw.height()')

I tried using the $provider and the spyOn methods, but none are working. Please help.

Arun

Answer 1

Apparently the height() and the width() functions are incorrect. I changed them to innerHeight and innerWidth properties.

services.factory('homePageRes', ['$resource', '$window',
    function ($resource, $window) {
       return $resource('home/index', {
           height: $window.innerHeight,
           width: $window.innerWidth
       });
    }]);

beforeEach(function () {
    angular.mock.module("amdotcom.services", function ($provide) {
        var myMock = {
            innerHeight: 400,
            innerWidth: 500
        };
        $provide.value('$window', myMock);
    });
});

Since my comment above was not formatted and less readable, I've added it again here.