anchor.diff:            clientEnd.shutdown(SocketDirection.SEND);
             serverEnd.shutdown(SocketDirection.SEND);
             server.close();
  +          print("asyncEnd testServerListenAfterConnect");
             asyncEnd();
           });
         });
  
positive.code:                     error is HandshakeException);
        clientEndFuture.then((_) {
          if (!cancelOnError) server.close();
          asyncEnd();
        });
      },
  
negative.code:     Expect.fail("Invalid arguments to testSimpleReadWrite");
    }
  
    print("asyncStart testSimpleReadWrite($listenSecure, $connectSecure, "
         "$handshakeBeforeSecure, $postponeSecure, $dropReads");
    asyncStart();
  
    const messageSize = 1000;
  