Initial commit

tests/BuyersTests/BuyersTests.cs

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+using IceCreamBuyers;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace IceCreamBuyers.Tests
+{
+    [TestClass]
+    public class BuyersTests
+    {
+        [TestMethod]
+        public void ShoppingListTotal()
+        {
+            // Anke: 2 flavours x 2 scoops x base prices (3 + 2) = 10.
+            // Red or flaky — why? (PriceList adds random surge pricing;
+            // it stands for the external pricing service.)
+            var buyers = new Buyers();
+            Assert.AreEqual(10, buyers.ShoppingListTotal("Anke"));
+        }
+    }
+}