anchor.diff:  import 'dart:async';
  +import 'dart:io';
   
   import 'package:redis/redis.dart';
   
  
positive.code:           (_) => testing_performance(test_pubsub_performance, "PubSub", 200000))
        .then((_) =>
            testing_performance(test_performance, "Raw Performance", 200000))
        .then((_) => test_long_running(20000))
        .then((_) => print("Finished Performance Tests"));
  }
  
  Future<int> testing_performance(
  
negative.code: //performance of this test depends on packet roundtrip time
  Future test_long_running(int n) {
    int start = new DateTime.now().millisecondsSinceEpoch;
    int update_period = 2000;
    int timeout = start + update_period;
    const String key = "keylr";
    return generate_connect().then((Command command) {
      int N = n;
      int c = 0;
      print("  started long running test of $n commands");
  