Solution

domain-model.md

@@ -1 +1,5 @@
-#Domain Models In Here
+#Domain Models In Here
+| Classes         | Methods                                     | Scenario               | Outputs |
+|-----------------|-----------------------|----------------------------|----------|
+| `Cart`          | `total()`             | Return total value of cart | double   |
+|                 | `receipt()`           | Return detailed receipt    | string   |

tdd-domain-modelling.CSharp.Main/Basket.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace tdd_domain_modelling.CSharp.Main
+{
+    public class Basket
+    {
+        private Dictionary<string, int> _prices = new Dictionary<string, int>();
+        private List<string> _items = new List<string>();
+
+        public List<string> Items { get { return _items; } }
+        public Boolean Add(string product, int price)
+        {
+            if (!_items.Contains(product))
+            {
+                _items.Add(product);
+                _prices.Add(product, price);
+                return true;
+            }
+            else
+            {
+                {  _items.Add(product); return false;  }
+            }
+
+        }
+
+        public int Total()
+        {
+            return _items.Select(p => _prices[p]).ToArray().Sum();
+        }
+    }
+}

tdd-domain-modelling.CSharp.Test/BasketTest.cs

@@ -0,0 +1,88 @@
+using Microsoft.VisualStudio.TestPlatform.CommunicationUtilities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using NUnit.Framework;
+using tdd_domain_modelling.CSharp.Main;
+using System.Xml.Linq;
+
+namespace tdd_domain_modelling.CSharp.Test
+{
+    public class BasketTest
+    {
+        [Test]
+        public void ShouldNotBeEmpty()
+        {
+            // 1. Set up
+            Basket basket = new Basket();
+
+            // 2. Execute
+            basket.Add("Milk", 5);
+
+            // 3. Verify
+            Assert.That(basket.Items.Count > 0);
+        }
+
+        [Test]
+        public void ShouldReturnTrue()
+        {
+            // 1. Set up
+            Basket basket = new Basket();
+
+            // 2. Execute
+            Boolean added = basket.Add("Milk", 5);
+
+            // 3. Verify
+            Assert.That(added);
+        }
+
+        [Test]
+        public void ShouldReturnFalse()
+        {
+            // 1. Set up
+            Basket basket = new Basket();
+
+            // 2. Execute
+            basket.Add("Milk", 5);
+            Boolean added = basket.Add("Milk", 5);
+
+            // 3. Verify
+            Assert.That(!added);
+        }
+
+        [Test]
+        public void ShouldReturnTotal()
+        {
+            // 1. Set up
+            Basket basket = new Basket();
+
+            // 2. Execute
+            basket.Add("Milk", 5);
+            basket.Add("Sugar", 7);
+            basket.Add("Egg", 4);
+
+            // 3. Verify
+            Assert.That(basket.Total() == 16);
+        }
+        [Test]
+        public void ShouldReturnTotalDuplicate()
+        {
+            // 1. Set up
+            Basket basket = new Basket();
+
+            // 2.
+            basket.Add("Sugar", 7);
+            basket.Add("Milk", 5);
+            basket.Add("Milk", 5);
+            basket.Add("Sugar", 7);
+            basket.Add("Egg", 4);
+
+            // 3. Verify
+            Assert.That(basket.Total() == 28);
+        }
+
+    }
+}