anchor.diff:  
       this.port.receive((message, SendPort replyTo) {
         if (message != SERVERSHUTDOWN) {
  +        _readBytes = 0;
           _errorEvents = 0;
           _dataEvents = 0;
           _closeEvents = 0;
  
positive.code:   SendPort _sendPort;
    Socket _socket;
    List<int> _buffer;
    int _dataEvents;
    int _closeEvents;
    int _errorEvents;
  
negative.code:         case 5:
          case 6:
            List<int> b = new List<int>(100);
            _readBytes += _socket.readList(b, 0, 100);
            if ((_readBytes % 5) == 0) {
              _dataEvents++;
            }
            break;
          default:
            Expect.fail("Unknown test mode");
  