fix: importar Apariencia en game.test.js

Corrige el error "Apariencia is not defined" agregando el import global en el test.

Author: milegros

game/js/systems/game.test.js

@@ -5,6 +5,7 @@ const assert = require('node:assert/strict');
 
 global.window = global;
 global.MapGen = { T: {}, walkable: () => true };
+global.Apariencia = require('../apariencia.js');
 
 const almacen = new Map();
 global.localStorage = {