8.2.1 Defining the Cart Entity; UNIT TEST: TESTING THE CART

SportsStore/SportsStore.Domain/Entities/Cart.cs

@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace SportsStore.Domain.Entities
 {
-    class Cart
+    public class Cart
     {
         private List<CartLine> lineCollection = new List<CartLine>();
 
@@ -35,6 +35,11 @@ namespace SportsStore.Domain.Entities
             lineCollection.RemoveAll(l => l.Product.ProductID == product.ProductID);
         }
 
+        public decimal ComputeTotalValue()
+        {
+            return lineCollection.Sum(e => e.Product.Price * e.Quantity);
+        }
+
         public void Clear()
         {
             lineCollection.Clear();

SportsStore/SportsStore.UnitTests/CartTests.cs

@@ -0,0 +1,120 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SportsStore.Domain.Entities;
+using System;
+using System.Linq;
+
+namespace SportsStore.UnitTests
+{
+    [TestClass]
+    public class CartTests
+    {
+        [TestMethod]
+        public void Can_Add_New_Lines()
+        {
+            // Arrange - create some test products
+            Product p1 = new Product { ProductID = 1, Name = "P1" };
+            Product p2 = new Product { ProductID = 2, Name = "P2" };
+
+            // Arrange - create a new cart
+            Cart target = new Cart();
+
+            // Act
+            target.AddItem(p1, 1);
+            target.AddItem(p2, 1);
+            CartLine[] results = target.Lines.ToArray();
+
+            // Assert
+            Assert.AreEqual(results.Length, 2);
+            Assert.AreEqual(results[0].Product, p1);
+            Assert.AreEqual(results[1].Product, p2);
+        }
+
+        [TestMethod]
+        public void Can_Add_Quantity_For_Existing_Lines()
+        {
+            // Arrange - create some test products
+            Product p1 = new Product { ProductID = 1, Name = "P1" };
+            Product p2 = new Product { ProductID = 2, Name = "P2" };
+
+            // Arrange - create a new cart
+            Cart target = new Cart();
+
+            // Act
+            target.AddItem(p1, 1);
+            target.AddItem(p2, 1);
+            target.AddItem(p1, 10);
+            CartLine[] results = target.Lines.OrderBy(c => c.Product.ProductID).ToArray();
+
+            // Assert
+            Assert.AreEqual(results.Length, 2);
+            Assert.AreEqual(results[0].Quantity, 11);
+            Assert.AreEqual(results[1].Quantity, 1);
+        }
+
+        [TestMethod]
+        public void Can_Remove_Line()
+        {
+            // Arrange - create some test products
+            Product p1 = new Product { ProductID = 1, Name = "P1" };
+            Product p2 = new Product { ProductID = 2, Name = "P2" };
+            Product p3 = new Product { ProductID = 3, Name = "P3" };
+
+            // Arrange - create a new cart
+            Cart target = new Cart();
+
+            // Arrange - add some products to the cart
+            target.AddItem(p1, 1);
+            target.AddItem(p2, 3);
+            target.AddItem(p3, 5);
+            target.AddItem(p2, 1);
+
+            // Act
+            target.RemoveLine(p2);
+
+            // Assert
+            Assert.AreEqual(target.Lines.Where(c => c.Product == p2).Count(), 0);
+            Assert.AreEqual(target.Lines.Count(), 2);
+        }
+
+        [TestMethod]
+        public void Calculate_Cart_Total()
+        {
+            // Arrange - create some test products
+            Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100M };
+            Product p2 = new Product { ProductID = 2, Name = "P2", Price = 50M };
+
+            // Arrange - create a new cart
+            Cart target = new Cart();
+
+            // Act
+            target.AddItem(p1, 1);
+            target.AddItem(p2, 1);
+            target.AddItem(p1, 3);
+            decimal result = target.ComputeTotalValue();
+
+            // Assert
+            Assert.AreEqual(result, 450M);
+        }
+
+        [TestMethod]
+        public void Can_Clear_Contents()
+        {
+            // Arrange - create some test products
+            Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100M };
+            Product p2 = new Product { ProductID = 2, Name = "P2", Price = 50M };
+
+            // Arrange - create a new cart
+            Cart target = new Cart();
+
+            // Arrange - add some items
+            target.AddItem(p1, 1);
+            target.AddItem(p2, 1);
+
+            // Act - reset the cart
+            target.Clear();
+
+            // Assert
+            Assert.AreEqual(target.Lines.Count(), 0);
+        }
+    }
+}

SportsStore/SportsStore.UnitTests/SportsStore.UnitTests.csproj

@@ -90,6 +90,7 @@
     <Compile Include="App_Start\NinjectWebCommon.cs" />
     <Compile Include="UnitTest1.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="CartTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="app.config" />