public void Calculate_Total_By_CartId()
        {
            var shoppingCartController =
                new ShoppingCartController(_shoppingCartManager, null);

            var cartCustomerDto = GenerateCreateCartDto();
            var actionResult    = shoppingCartController.Create(cartCustomerDto);
            var result          = actionResult.Result as CreatedAtRouteResult;
            var shoppingCart    = result?.Value as ShoppingCartDto;
            var item            = shoppingCartController.CalculateTotals(shoppingCart?.Id);

            item.Value.Total.Should().Be(59.4);
        }