public JourneyPlannerController(IJourneyPlanner tubeJourneyPlanner, IStationValidator stationValidator)
 {
     this.tubeJourneyPlanner = tubeJourneyPlanner;
     this.stationValidator = stationValidator;
 }
 public JourneyPlannerController()
 {
     this.tubeJourneyPlanner = new TubeJourneyPlanner();
     this.stationValidator = new StationValidator();
 }