anchor.diff:    Stopwatch watch = new Stopwatch();
     Timer timer;
   
  +  ClockState currentState;
  +
     Clock(){
       startPomodoroAt = (25*60);
       startRestAt = (5*60);
       durationRest = prettyPrintTime(startRestAt);
       durationPomodoro = prettyPrintTime(startPomodoroAt);
       counter= prettyPrintTime(25*60);
  +    currentState = ClockState.pomodoro;
     }
     
     void start() {
  
positive.code: <input #durationrest>
  <button (click)="setDurationRest(durationrest.value)">change</button>
  </p>
  ''')
  
  class Clock{
  
  
negative.code: import 'dart:async';
  
  import 'package:angular2/angular2.dart';
  
  enum ClockState{
    pomodoro,
    rest
  }
  
  @Component(selector: 'clock')
  
  