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CasinoGameUnittests.cs

+using System;
+
+namespace CasinoGameTests
+{
+    [TestClass]
+    public class CasinoGameUnitTests
+    {
+        private class TestObserver : IObserver
+        {
+            public string LastMessage { get; private set; }
+            public void Update(string message) => LastMessage = message;
+        }
+
+        [TestMethod]
+        public void ObserverReceivesNotification()
+        {
+            CasinoGame game = new CasinoGame();
+            TestObserver observer = new TestObserver();
+            game.Attach(observer);
+
+            game.Notify("Test Nachricht");
+
+            Assert.AreEqual("Test Nachricht", observer.LastMessage);
+        }
+
+        [TestMethod]
+        public void ObserverCanBeDetached()
+        {
+            CasinoGame game = new CasinoGame();
+            TestObserver observer = new TestObserver();
+            game.Attach(observer);
+            game.Detach(observer);
+
+            game.Notify("Test Nachricht");
+
+            Assert.IsNull(observer.LastMessage);
+        }
+    }
+
+    [TestClass]
+    public class BalanceManagerTests
+    {
+        [TestMethod]
+        public void InitialBalance_IsCorrect()
+        {
+            Assert.AreEqual(1000, BalanceManager.Instance.Balance);
+        }
+
+        [TestMethod]
+        public void BalanceCanBeModified()
+        {
+            BalanceManager.Instance.Balance = 500;
+            Assert.AreEqual(500, BalanceManager.Instance.Balance);
+        }
+    }
+
+    [TestClass]
+    public class RouletteTests
+    {
+        private Casino casino;
+
+        [TestInitialize]
+        public void Setup()
+        {
+            casino = new Casino();
+        }
+
+        [TestMethod]
+        public void IsWinningBet_CorrectlyIdentifiesWin()
+        {
+            Assert.IsTrue(casino.IsWinningBet("rot", 1)); // 1 ist eine rote Zahl
+            Assert.IsFalse(casino.IsWinningBet("schwarz", 1)); // 1 ist nicht schwarz
+        }
+
+        [TestMethod]
+        public void CalculateWinnings_CorrectValues()
+        {
+            Assert.AreEqual(3600, casino.CalculateWinnings("0", 100)); // 0 zahlt x36
+            Assert.AreEqual(3500, casino.CalculateWinnings("5", 100)); // Einzelzahl x35
+            Assert.AreEqual(300, casino.CalculateWinnings("1-12", 100)); // Drittel x3
+            Assert.AreEqual(200, casino.CalculateWinnings("schwarz", 100)); // 1:1 Wetten
+        }
+    }
+
+    [TestClass]
+    public class BlackjackTests
+    {
+        private Casino casino;
+
+        [TestInitialize]
+        public void Setup()
+        {
+            casino = new Casino();
+        }
+
+        [TestMethod]
+        public void GetHandValue_AceAdjustsCorrectly()
+        {
+            List<int> hand = new List<int> { 1, 10 }; // Ass und 10
+            Assert.AreEqual(21, casino.GetHandValue(hand));
+
+            hand = new List<int> { 1, 10, 10 }; // Ass, 10, 10 -> Ass zählt als 1
+            Assert.AreEqual(21, casino.GetHandValue(hand));
+
+            hand = new List<int> { 1, 1, 8 }; // Zwei Asse und eine 8 -> Ass als 1
+            Assert.AreEqual(20, casino.GetHandValue(hand));
+        }
+
+        [TestMethod]
+        public void DealerPlay_HitsUntilThreshold()
+        {
+            List<int> dealerHand = new List<int> { 2, 3 }; // Summe 5
+            casino.DealerPlay(ref dealerHand);
+            Assert.IsTrue(casino.GetHandValue(dealerHand) >= 17);
+        }
+    }
+}