如何模拟$ window单元测试AngularJS服务？

Here is my service:

这是我的服务:

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;
      };
  }]);
var services =