@Test
  public void recycleEntity() {
    PooledEngine engine = new PooledEngine();

    int numEntities = 200;
    Array<Entity> entities = new Array<Entity>();

    for (int i = 0; i < numEntities; ++i) {
      Entity entity = engine.createEntity();
      assertEquals(0, entity.flags);
      engine.addEntity(entity);
      entities.add(entity);
      entity.flags = 1;
    }

    for (Entity entity : entities) {
      engine.removeEntity(entity);
      assertEquals(0, entity.flags);
    }

    for (int i = 0; i < numEntities; ++i) {
      Entity entity = engine.createEntity();
      assertEquals(0, entity.flags);
      engine.addEntity(entity);
      entities.add(entity);
    }
  }
 @Override
 public void update(float deltaTime) {
   Entity entity;
   PooledEngine engine = (PooledEngine) getEngine();
   for (int i = 0; i < 10; i++) {
     entity = engine.createEntity();
     assertEquals(0, entity.flags);
     entity.flags = 1;
     entity.add(engine.createComponent(PositionComponent.class));
     engine.addEntity(entity);
   }
   for (int i = 0; i < entities.size(); ++i) {
     entity = entities.get(i);
     engine.removeEntity(entity);
     engine.removeEntity(entity);
   }
 }