Close door after walking through again, and add more test coverage

src/engine/__tests__/world.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { idx, inBounds, isWall, isBlocked } from '../world/world-logic';
+import { idx, inBounds, isWall, isBlocked, tryDestructTile, isPlayerOnExit } from '../world/world-logic';
 import { type World, type Tile } from '../../core/types';
 import { TileType } from '../../core/terrain';
 
@@ -114,4 +114,65 @@ describe('World Utilities', () => {
       expect(isBlocked(world, 10, 10)).toBe(true);
     });
   });
+  describe('tryDestructTile', () => {
+    it('should destruct a destructible tile', () => {
+      const tiles = new Array(100).fill(TileType.EMPTY);
+      tiles[0] = TileType.GRASS;
+      const world = createTestWorld(10, 10, tiles);
+
+      const result = tryDestructTile(world, 0, 0);
+      
+      expect(result).toBe(true);
+      expect(world.tiles[0]).toBe(TileType.GRASS_SAPLINGS);
+    });
+
+    it('should not destruct a non-destructible tile', () => {
+      const tiles = new Array(100).fill(TileType.EMPTY);
+      tiles[0] = TileType.WALL;
+      const world = createTestWorld(10, 10, tiles);
+
+      const result = tryDestructTile(world, 0, 0);
+      
+      expect(result).toBe(false);
+      expect(world.tiles[0]).toBe(TileType.WALL);
+    });
+    
+    it('should return false for out of bounds', () => {
+        const world = createTestWorld(10, 10, new Array(100).fill(TileType.EMPTY));
+        expect(tryDestructTile(world, -1, 0)).toBe(false);
+    });
+  });
+
+  describe('isPlayerOnExit', () => {
+    it('should return true when player is on exit', () => {
+      const world = createTestWorld(10, 10, new Array(100).fill(TileType.EMPTY));
+      world.exit = { x: 5, y: 5 };
+      world.actors.set(1, {
+        id: 1,
+        pos: { x: 5, y: 5 },
+        isPlayer: true
+      } as any);
+
+      expect(isPlayerOnExit(world, 1)).toBe(true);
+    });
+
+    it('should return false when player is not on exit', () => {
+      const world = createTestWorld(10, 10, new Array(100).fill(TileType.EMPTY));
+      world.exit = { x: 5, y: 5 };
+      world.actors.set(1, {
+        id: 1,
+        pos: { x: 4, y: 4 },
+        isPlayer: true
+      } as any);
+
+      expect(isPlayerOnExit(world, 1)).toBe(false);
+    });
+
+    it('should return false when player does not exist', () => {
+      const world = createTestWorld(10, 10, new Array(100).fill(TileType.EMPTY));
+      world.exit = { x: 5, y: 5 };
+      
+      expect(isPlayerOnExit(world, 999)).toBe(false);
+    });
+  });
 });