public ParkingMeter(IDateTimeProvider dateTimeProvider, IMeterTill meterTill)
        {
            DateTimeProvider = dateTimeProvider;
            MeterTill        = meterTill;

            expiringTime = DateTime.MinValue;
        }
 public void Setup()
 {
     dateTimeProvider = new DateTimeProvider();
     meterTill        = new MeterTill(20);
 }