fix: TileRegistry floor-range warning, GroupViewsByFloor tests, stopwatch cleanup

Assets/Tests/EditMode/TileRegistryTests.cs

@@ -39,11 +39,31 @@ namespace DecayGrid.Tests
         }
 
         [Test]
-        public void TryGetView_ReturnsFalse_WhenNoViewRegistered()
+        public void TryGetView_ReturnsFalse_WhenTileHasNoView()
         {
             var tile = new Tile("0_0_0", 0, 0.5f, 2f);
             _registry.Register(tile); // no view
             Assert.IsFalse(_registry.TryGetView("0_0_0", out _));
         }
+
+        [Test]
+        public void GroupViewsByFloor_PlacesTileOnCorrectFloor()
+        {
+            // Can't create TileViewAdapter in EditMode (MonoBehaviour), so just verify tile with no view doesn't crash
+            var tile = new Tile("1_5_5", 1, 0.5f, 2f);
+            _registry.Register(tile); // no view
+            var floors = _registry.GroupViewsByFloor(3);
+            Assert.AreEqual(3, floors.Count);
+            // Tile has no view registered, so no view should appear in any floor
+            Assert.AreEqual(0, floors[1].Count);
+        }
+
+        [Test]
+        public void GroupViewsByFloor_OutOfRangeTile_DoesNotThrow()
+        {
+            var tile = new Tile("5_0_0", 5, 0.5f, 2f); // floor 5, but only 3 floors
+            _registry.Register(tile);
+            Assert.DoesNotThrow(() => _registry.GroupViewsByFloor(3));
+        }
     }
 }