How to mock and test service in angular

search-setting-controller.js

define(['controllers/controllers', 
        'services/search-setting-service'], function(controllers) {
   controllers.controller('SearchSettingController', 
       ['$scope', 'SearchSettingService', function($scope, SearchSettingService) {
        SearchSettingService.setting().then(function(setting) {
            $scope.setting = setting;
            $scope.currentVendor = setting.vendors[0];
        });
   }]);
});

search-setting-service-spec.js

define(['angular', 
        'angular-mocks', 
        'services/services', 
        'services/search-setting-service'],
  function() {
    describe('Search Setting Service', function() {
      var settingService;
      var httpBackend;

      beforeEach(function() {
          module('services');
          
          inject(function(SearchSettingService, $httpBackend) {
            settingService = SearchSettingService;
            httpBackend = $httpBackend;
          });
      });

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

      it("should have setting method", function() {
        expect(angular.isFunction(settingService.setting)).toBe(true);
      });

      it('should have settings from http request', function() {
        var result;
        var expected = {
            "period": "day",
            "date": "Sat Dec 21 12:56:53 EST 2013",
        };

        httpBackend.expectGET('/settings.json').respond(expected);

        var promise = settingService.setting();
        promise.then(function(data) {
            result = data;
        });

        httpBackend.flush();

        expect(result).toEqual(expected);
      });


      it("should throw error when network expection", function() {
        var result, error;
        httpBackend.expectGET('/settings.json').respond(500);

        var promise = settingService.setting();
        promise.then(function(data) {
            result = data;
        }, function(data) {
            error = data;
        });

        httpBackend.flush();

        expect(result).toBeUndefined();
        expect(error).toEqual("network error");
      });
    });
  });

search-setting-service.js

define(['services/services'], function(services) {
    services.factory('SearchSettingService', 
        ['$http', '$q', function($http, $q) {
        return {
            setting: function() {
                var deferred = $q.defer();
                
                $http.get('/settings.json').success(function(result) {
                    deferred.resolve(result);
                }).error(function(result) {
                    deferred.reject("network error");
                });

                return deferred.promise;
            }
        };
    }]);
});