public void ChangeManagerTest()
{
//Refer : https://github.com/csparpa/gof-design-patterns/blob/master/java/src/tk/csparpa/gofdp/observer/variants/Demo.java
var manager = new ChangeManager();
var commander = new Commander("Golden", manager);
var soldierOne = new Soldier("Harry", manager);
var soldierTwo = new Soldier("Paul", manager);
manager.RegisterPublisher("solider", soldierOne);
manager.RegisterPublisher("solider", soldierTwo);
manager.RegisterSubscriber("solider", commander);
manager.RegisterPublisher("commander", commander);
manager.RegisterSubscriber("commander", soldierOne);
manager.RegisterSubscriber("commander", soldierTwo);
commander.SendCmd(new MapPoint(100, 100));
Assert.AreEqual(2, commander.Soldiers.Count);
}