anchor.diff:    })
     .then((_){
       //return testing_helper(test_long_running(2000000),"one by one for longer time");
  -  });
  -
  -}
  +  })
  +  .then((_){
  +    return testing_helper(test_performance(200000),"raw performance");
  +  });
  +
  +}
  
positive.code:       double perf = N/diff;
        print("$N operations done in $diff s\nperformance $perf/s");
      });
      command.pipe_end();
      return r;
    });
  }
  
negative.code: import 'dart:collection';
  import '../lib/redis.dart';
  
  Future test_performance(int n){
    int N = n;
    int rec=0;
    int start;
    RedisConnection conn = new RedisConnection();
    Duration zero = new Duration(seconds:0);
    return conn.connect('localhost',6379).then((Command command){
      start =  new DateTime.now().millisecondsSinceEpoch;
      command.pipe_start();
      command.send_object(["SET","test","0"]);
  