anchor.diff:      print("Initialse Status is true - OK");
     } else {
       print("Oops Initialse Status is false - ERROR");
  +    exit(badExitCode);
     }
   
     // Send a null message
  
positive.code:     print("Null message not sent - OK");
    } else {
      print("Oops null message sent - ERROR");
    }
  
    // Send a couple of whoHas messages
  
negative.code: library dartivity.test;
  
  import 'dart:async';
  import 'dart:io';
  
  import 'package:dartivity/dartivity.dart';
  
  Future main() async {
    final int badExitCode = -1;
  
    // Instantiate a Dartivity client and initialise for
    // messaging only
    Dartivity dartivity = new Dartivity(Mode.messagingOnly);
  