refactor: TileRegistry replaces parallel tile/view collections

Assets/Tests/EditMode/TileRegistryTests.cs

@@ -0,0 +1,49 @@
+using NUnit.Framework;
+using Core.Domain;
+using Infrastructure.Unity;
+
+namespace DecayGrid.Tests
+{
+    public class TileRegistryTests
+    {
+        private TileRegistry _registry;
+
+        [SetUp]
+        public void SetUp() => _registry = new TileRegistry();
+
+        [Test]
+        public void Register_AddsToAllTiles()
+        {
+            var tile = new Tile("0_0_0", 0, 0.5f, 2f);
+            _registry.Register(tile);
+            Assert.AreEqual(1, _registry.AllTiles.Count);
+        }
+
+        [Test]
+        public void FindTiles_ReturnsMatchingTiles()
+        {
+            var tile = new Tile("0_0_0", 0, 0.5f, 2f);
+            _registry.Register(tile);
+            var result = _registry.FindTiles(t => t.CurrentState == TileState.Stable);
+            Assert.AreEqual(1, result.Count);
+        }
+
+        [Test]
+        public void FindTiles_ExcludesNonMatchingTiles()
+        {
+            var tile = new Tile("0_0_0", 0, 0.5f, 2f);
+            tile.StepOn(); // Now Warning
+            _registry.Register(tile);
+            var result = _registry.FindTiles(t => t.CurrentState == TileState.Stable);
+            Assert.AreEqual(0, result.Count);
+        }
+
+        [Test]
+        public void TryGetView_ReturnsFalse_WhenNoViewRegistered()
+        {
+            var tile = new Tile("0_0_0", 0, 0.5f, 2f);
+            _registry.Register(tile); // no view
+            Assert.IsFalse(_registry.TryGetView("0_0_0", out _));
+        }
+    }
+}