impl

tests/SlaySharp.Tests/CombatEngineTests.cs

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+using SlaySharp.Core.Catalogs;
+using SlaySharp.Core.Combat;
+using SlaySharp.Core.Enums;
+using SlaySharp.Core.Models;
+using Xunit;
+
+namespace SlaySharp.Tests;
+
+public class CombatEngineTests
+{
+    [Fact]
+    public void CombatEngine_InitializesDeckAndDraws5Cards()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3, seed: 42);
+        player.MasterDeck.AddRange(StarterDecks.CreateCsharpArchitectDeck());
+
+        var engine = new CombatEngine();
+        var enemy = new NullReferenceExceptionEnemy();
+
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        Assert.Equal(CombatPhase.PlayerTurn, engine.Phase);
+        Assert.Equal(3, player.CurrentEnergy);
+        Assert.Equal(5, player.Hand.Count);
+        Assert.Equal(7, player.DrawPile.Count);
+        Assert.Empty(player.DiscardPile);
+    }
+
+    [Fact]
+    public void PlayCard_DealsDamage_AndConsumesEnergy()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3);
+        var card = new ConsoleWriteLineCard(); // Cost 1, dmg 6
+        var enemy = new NullReferenceExceptionEnemy(); // 45 HP
+
+        var engine = new CombatEngine();
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        // Force hand
+        player.Hand.Clear();
+        player.Hand.Add(card);
+        player.CurrentEnergy = 3;
+
+        var success = engine.PlayCard(card, enemy);
+
+        Assert.True(success);
+        Assert.Equal(2, player.CurrentEnergy);
+        Assert.Equal(39, enemy.CurrentHp);
+        Assert.Contains(card, player.DiscardPile);
+    }
+
+    [Fact]
+    public void SpanSliceCard_PiercesThroughShield()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3);
+        var card = new SpanSliceCard(); // 8 piercing dmg
+        var enemy = new NullReferenceExceptionEnemy(); // 45 HP
+
+        var engine = new CombatEngine();
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        enemy.GainShield(10);
+        player.Hand.Clear();
+        player.Hand.Add(card);
+        player.CurrentEnergy = 3;
+
+        var success = engine.PlayCard(card, enemy);
+
+        Assert.True(success);
+        Assert.Equal(10, enemy.Shield); // Shield remains 10!
+        Assert.Equal(37, enemy.CurrentHp); // 45 - 8 = 37
+    }
+
+    [Fact]
+    public void StatusEffects_StrengthAndVulnerable_MultiplyDamage()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3);
+        var enemy = new NullReferenceExceptionEnemy(); // 45 HP
+        var card = new ConsoleWriteLineCard(); // 6 dmg
+
+        var engine = new CombatEngine();
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        player.Statuses.Add(StatusType.Strength, 2); // Base 6 + 2 = 8
+        enemy.Statuses.Add(StatusType.Vulnerable, 1); // 8 * 1.5 = 12
+
+        player.Hand.Clear();
+        player.Hand.Add(card);
+        player.CurrentEnergy = 3;
+
+        engine.PlayCard(card, enemy);
+
+        Assert.Equal(33, enemy.CurrentHp); // 45 - 12 = 33
+    }
+
+    [Fact]
+    public void DiscardPile_Reshuffles_WhenDrawPileEmpty()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3, seed: 123);
+        // Only 3 cards in master deck
+        player.MasterDeck.Add(new ConsoleWriteLineCard());
+        player.MasterDeck.Add(new TryCatchCard());
+        player.MasterDeck.Add(new LinqWhereCard());
+
+        var engine = new CombatEngine();
+        var enemy = new OffByOneBugEnemy();
+
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        // All 3 cards drawn to hand, draw pile empty
+        Assert.Equal(3, player.Hand.Count);
+        Assert.Empty(player.DrawPile);
+
+        // Discard 2 cards
+        player.DiscardPile.Add(player.Hand[0]);
+        player.DiscardPile.Add(player.Hand[1]);
+        player.Hand.RemoveRange(0, 2);
+
+        // Request drawing 2 cards
+        player.DrawCards(2, engine.Log);
+
+        Assert.Equal(3, player.Hand.Count);
+        Assert.Empty(player.DiscardPile);
+    }
+
+    [Fact]
+    public void KillingAllEnemies_TriggersVictory()
+    {
+        var player = new Player("Senior Dev", 70, maxEnergy: 3);
+        var card = new ThrowExceptionCard(); // 16 dmg
+        var enemy = new OffByOneBugEnemy(); // 22 HP
+
+        var engine = new CombatEngine();
+        engine.StartCombat(player, new List<Enemy> { enemy });
+
+        enemy.CurrentHp = 10; // low HP
+        player.Hand.Clear();
+        player.Hand.Add(card);
+        player.CurrentEnergy = 2;
+
+        engine.PlayCard(card, enemy);
+
+        Assert.Equal(CombatPhase.Victory, engine.Phase);
+        Assert.Empty(engine.Enemies);
+    }
+}