如何从主要活动中激活FirebaseMessagingService.onMessageReceived？

Question

出于测试目的，我想从我的应用程序的主要活动中以编程方式触发从FirebaseMessagingService扩展的MyFirebaseMessagingService类的onMessageReceived方法。我怎么能这样做？

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage)
    {         
       // I would like to arrive here           
    }
}

谢谢！