AdventureWorks.UILogic.ViewModels.ShoppingCartPageViewModel.OnNavigatedTo C# (CSharp) Метод

        public override async void OnNavigatedTo(NavigatedToEventArgs e, Dictionary<string, object> viewModelState)
        {
            base.OnNavigatedTo(e, viewModelState);
            _signInUserControlViewModel.OnNavigatedTo(e, viewModelState);
            await UpdateShoppingCartInfoAsync();
        }

        public void OnNavigatedTo_Fill_Properties_With_Shopping_Cart_Items()
        {
            var navigationService = new MockNavigationService();
            var shoppingCartRepository = new MockShoppingCartRepository();
            shoppingCartRepository.GetShoppingCartAsyncDelegate = () =>
            {
                ShoppingCart shoppingCart = null;
                var shoppingCartItems = new ObservableCollection<ShoppingCartItem>
                                            {
                                                new ShoppingCartItem() {Product = new Product { ListPrice = 100, DiscountPercentage = 50, ProductNumber = "p1", ImageUri = new Uri("http://image")}, Currency = "USD", Quantity = 1}, 
                                                new ShoppingCartItem() {Product = new Product { ListPrice = 100, DiscountPercentage = 50, ProductNumber = "p2", ImageUri = new Uri("http://image")}, Currency = "USD", Quantity = 1}
                                            };
                shoppingCart = new ShoppingCart(shoppingCartItems) { Currency = "USD"};

                return Task.FromResult(shoppingCart);
            };

            bool signInUserControlOnNavigatedToCalled = false;
            var signInUserControlViewModel = new MockSignInUserControlViewModel()
                {
                    OnNavigatedToDelegate = (a, b, c) => signInUserControlOnNavigatedToCalled = true
                };

            var eventAggregator = new MockEventAggregator();
            eventAggregator.GetEventDelegate = type => new MockShoppingCartUpdatedEvent();
            var target = new ShoppingCartPageViewModel(shoppingCartRepository, navigationService, new MockAccountService(), signInUserControlViewModel, null, null, null, null, eventAggregator);
            target.OnNavigatedTo(new NavigatedToEventArgs { Parameter = null, NavigationMode = NavigationMode.New }, null);

            Assert.IsTrue(signInUserControlOnNavigatedToCalled);
            Assert.AreEqual("$200.00", target.FullPrice);
            Assert.AreEqual("$100.00", target.TotalDiscount);
            Assert.AreEqual(2, target.ShoppingCartItemViewModels.Count);
        }