public static void SetObserver(IExecutionObserver observer)
 {
     _observer = observer;
     #if DEBUG
     ExecutionObserverDebugger.Test(_observer);
     #endif
 }
 public static void CallCount()
 {
     #if DEBUG
     ExecutionObserverDebugger.Test(_observer);
     #endif
     if (_observer != null)
     {
         _observer.CallCount();
     }
 }