AngularJs unit testing scope variable(array) inside controller is undefined?

I am writing unit testing in angularJS for controllers.

I am testing for each scope variable defined inside controller.

This particular error is occurring only for array scope variable.

Other than that I can test dictionary, string ,Boolean variables and also functions successfully.

Please tell me how to test an array scope variable inside controller?

Code for controller:

 ctrls.controller('catalogController', ['$scope', '$state',
                                        'utilService', 'products',  
                                        'catalogFactory',
                                        'notificationFactory',
                                        '$rootScope',
                                        '$location',function($scope){
                                             $scope.productList = [];
                                         }
);

Test case code for controller:

describe('TestingcatalogController',
function() {
    var $controller,
        scope,
        rootScope,
        state,
        notificationFactory,
        createUserData,
        deferred,
        utilService,
        products,
        catalogFactory,
        location;
    beforeEach(function() {
          module('gem.catalog.controllers');
        module('gem.fixture.catalogs');
        module('gem.mock.state');
        module('gem.mock.common.factories');
        module('gem.mock.common.constants');
        module('gem.mock.common.services');
        module('gem.mock.catalogs.factories');
        inject(function($rootScope, _$controller_, mockState, mockNotificationFactory, mockCatalogsFactory, listProducts, utilService) {
            scope = $rootScope.$new();
            rootScope = $rootScope.$new();
            state = mockState;
            notificationFactory = mockNotificationFactory;
            catalogFactory = mockCatalogsFactory;
            products = listProducts;
            $controller = _$controller_('catalogController', {
                $scope: scope,
                $rootScope: rootScope,
                products: listProducts,
                $state: state,
                catalogFactory: catalogFactory,
                utilService: utilService,
                notificationFactory: notificationFactory
            }); //scope._private_.pushToErrorMessage=spyOn(scope._private_,
            'pushToErrorMessage').and.callThrough();
        });
    }); 
    describe('testallvariables', function() {
        it('shouldhaveproductListvariableinaScope', function() {
            expect(scope.productList).not.toBeNull();
            expect(scope.productList).toEqual([]);
        }); 
    });
});

Error:

  Chrome 41.0.2272 (Linux) Testing catalogController  test all variables should have productList variable in a Scope FAILED
    Expected undefined to equal [  ].
    at Object.<anonymous> (/home/vikrant/project/gem-bo/test/unit/catalogs/controllers.js:72:28)
  Chrome 41.0.2272 (Linux): Executed 258 of 258 (1 FAILED) (1.124 secs / 1.056 secs)