Fix bug #263

src/Services/Ordering/Ordering.Domain/AggregatesModel/OrderAggregate/Order.cs

@@ -72,8 +72,9 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.O
                 if (discount > existingOrderForProduct.GetCurrentDiscount())
                 {
                     existingOrderForProduct.SetNewDiscount(discount);
-                    existingOrderForProduct.AddUnits(units);
                 }
+
+                existingOrderForProduct.AddUnits(units);
             }
             else
             {
@@ -187,6 +188,11 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.O
         {
             throw new OrderingDomainException($"Not possible to change order status from {OrderStatus.Name} to {orderStatusToChange.Name}.");
         }
+
+        public decimal GetTotal()
+        {
+            return _orderItems.Sum(o => o.GetUnits() * o.GetUnitPrice());
+        }
     }
 }
 

src/Services/Ordering/Ordering.Domain/AggregatesModel/OrderAggregate/OrderItem.cs

@@ -59,6 +59,11 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.O
             return _units;
         }
 
+        public decimal GetUnitPrice()
+        {
+            return _unitPrice;
+        }
+
         public string GetOrderItemProductName() => _productName;
 
         public void SetNewDiscount(decimal discount)

test/Services/UnitTest/Ordering/Builders.cs

@@ -0,0 +1,47 @@
+using System;
+using Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.OrderAggregate;
+
+namespace UnitTest.Ordering
+{
+    public class AddressBuilder
+    {
+        public Address Build()
+        {
+            return new Address("street", "city", "state", "country", "zipcode");
+        }
+    }
+
+    public class OrderBuilder
+    {
+        private readonly Order order;
+
+        public OrderBuilder(Address address)
+        {
+            order = new Order(
+                "userId",
+                address,
+                cardTypeId:5,
+                cardNumber:"12",
+                cardSecurityNumber:"123",
+                cardHolderName:"name",
+                cardExpiration:DateTime.UtcNow);
+        }
+
+        public OrderBuilder AddOne(
+            int productId,
+            string productName,
+            decimal unitPrice,
+            decimal discount,
+            string pictureUrl,
+            int units = 1)
+        {
+            order.AddOrderItem(productId, productName, unitPrice, discount, pictureUrl, units);
+            return this;
+        }
+
+        public Order Build()
+        {
+            return order;
+        }
+    }
+}

test/Services/UnitTest/Ordering/Domain/OrderAggregateTest.cs

@@ -2,6 +2,8 @@
 using Ordering.Domain.Events;
 using Ordering.Domain.Exceptions;
 using System;
+using System.Linq;
+using UnitTest.Ordering;
 using Xunit;
 
 public class OrderAggregateTest
@@ -93,6 +95,18 @@ public class OrderAggregateTest
         Assert.Throws<OrderingDomainException>(() => fakeOrderItem.AddUnits(-1));
     }
 
+    [Fact]
+    public void when_add_two_times_on_the_same_item_then_the_total_of_order_should_be_the_sum_of_the_two_items()
+    {
+        var address = new AddressBuilder().Build();
+        var order = new OrderBuilder(address)
+            .AddOne(1,"cup",10.0m,0,string.Empty)
+            .AddOne(1,"cup",10.0m,0,string.Empty)
+            .Build();
+
+        Assert.Equal(20.0m, order.GetTotal());
+    }
+
     [Fact]
     public void Add_new_Order_raises_new_event()
     {