public async Task Add_Product_To_Shopping_Cart_Should_Not_Be_Null() { // Arrange var product = new CartProductViewModel() { CartId = 1, ProductId = 1, }; _cartServiceMock.Setup(x => x.AddProductToCart(product)).Returns(Task.FromResult(product)); // Act var result = await _shoppingCartController.AddProductToShoppingCart(product); // Assert var objectResult = result as OkObjectResult; Assert.NotNull(objectResult); var content = objectResult.Value as CartProductViewModel; Assert.NotNull(content); }