public void SpaceObjectObserverGetsUpdated()
{
var mockObserver = new Mock <ISpaceObjectObserver>();
var spaceObject = new SpaceObject(new Vector2(3, 2), new Vector2(1, 0));
spaceObject.AttachObserver(mockObserver.Object);
spaceObject.Position = new Vector2(1, 7);
spaceObject.Rotation = new Vector2(1, 4);
mockObserver.Verify(observer => observer.ObjectUpdated(), Times.Exactly(2));
}