public void CanShipOrder()
 {
     Order o = new Order();
     o.Complete();
     o.Prepare();
     o.Ship();
 }
 public void CanCancelOrder()
 {
     Order o = new Order();
     o.Complete();
     o.Cancel();
 }
 public void CannotCancelPreparedOrder()
 {
     Order o = new Order();
     o.Complete();
     o.Prepare();
     o.Cancel();
 }