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

src/core/__tests__/terrain.test.ts

@@ -0,0 +1,54 @@
+import { describe, it, expect } from 'vitest';
+import { 
+  TileType, 
+  isBlocking, 
+  isDestructible, 
+  blocksSight, 
+  getDestructionResult,
+  isDestructibleByWalk
+} from '../terrain';
+
+describe('Terrain', () => {
+  describe('Tile Definitions', () => {
+    it('should correctly identify blocking tiles', () => {
+      expect(isBlocking(TileType.WALL)).toBe(true);
+      expect(isBlocking(TileType.WALL_DECO)).toBe(true);
+      expect(isBlocking(TileType.WATER)).toBe(true);
+      
+      expect(isBlocking(TileType.EMPTY)).toBe(false);
+      expect(isBlocking(TileType.GRASS)).toBe(false);
+      expect(isBlocking(TileType.EXIT)).toBe(false);
+    });
+
+    it('should correctly identify destructible tiles', () => {
+      expect(isDestructible(TileType.GRASS)).toBe(true);
+      expect(isDestructible(TileType.DOOR_CLOSED)).toBe(true);
+      
+      expect(isDestructible(TileType.WALL)).toBe(false);
+      expect(isDestructible(TileType.EMPTY)).toBe(false);
+    });
+
+    it('should correctly identify tiles blocking sight', () => {
+      expect(blocksSight(TileType.WALL)).toBe(true);
+      expect(blocksSight(TileType.WALL_DECO)).toBe(true);
+      expect(blocksSight(TileType.DOOR_CLOSED)).toBe(true);
+      expect(blocksSight(TileType.GRASS)).toBe(true); // Grass blocks vision in this game logic
+      
+      expect(blocksSight(TileType.EMPTY)).toBe(false);
+      expect(blocksSight(TileType.EXIT)).toBe(false);
+    });
+
+    it('should return correct destruction result', () => {
+      expect(getDestructionResult(TileType.GRASS)).toBe(TileType.GRASS_SAPLINGS);
+      expect(getDestructionResult(TileType.DOOR_CLOSED)).toBe(TileType.DOOR_OPEN);
+      
+      expect(getDestructionResult(TileType.WALL)).toBeUndefined();
+    });
+    
+    it('should correctly identify tiles destructible by walk', () => {
+        expect(isDestructibleByWalk(TileType.GRASS)).toBe(true);
+        expect(isDestructibleByWalk(TileType.DOOR_CLOSED)).toBe(true);
+        expect(isDestructibleByWalk(TileType.WALL)).toBe(false);
+    });
+  });
+});