茉莉花间谍和解决承诺

我正在测试一个使用返回promise的服务的控制器。我在测试中模拟了一个服务，并创建了一个spy，这样我就可以测试是否真的调用了该服务。

然而，我不断得到这个错误

TypeError: 'undefined' is not a function 
    (evaluating 'spyOn(mockService, 'one').andReturn(deferred.promise)')

我的测试

beforeEach(inject(function($rootScope, $controller, $q) {
  scope = $rootScope.$new();
  mockService = {
    one: function(){
      // mock promise
      var deferred = $q.defer();
      deferred.resolve([
        //my array
      ]);
      return deferred.promise;
    },
    two: function(){
      // mock promise
      var deferred = $q.defer();
      deferred.resolve([
        //my data
      ]);
      return deferred.promise;
    }
  }
  var deferred = $q.defer();
  spyOn(mockService, 'one').andReturn(deferred.promise);
  controller = $controller('MyCtrl', {
    $scope: scope,
    mockService: mockService
  });
}));
it('should call mockService service', function(){
  //causes promises to check to see if they are fulfilled
  scope.$digest();
  expect(mockService.one).toHaveBeenCalled();
});