30DaysOfTDD_Day20_Part2

        private void CheckInventoryLevels(ShoppingCart shoppingCart, Guid orderFulfillmentSessionId, out Guid firstItemId, out int firstItemQuantity)
        {
            firstItemId = shoppingCart.Items[0].ItemId;
            firstItemQuantity = shoppingCart.Items[0].Quantity;

            //Check Inventory Level
            var itemIsInInventory = _orderFulfillmentService.IsInInventory(orderFulfillmentSessionId, firstItemId, firstItemQuantity);
        }