public void Parking_IsSingelton()
{
var newParkingService = new ParkingService(_withdrawTimer, _logTimer, _logService);
var vehicle = new Vehicle("AA-0001-AA", VehicleType.Truck, 100);
_parkingService.AddVehicle(vehicle);
Assert.Single(newParkingService.GetVehicles());
Assert.Single(_parkingService.GetVehicles());
Assert.Same(_parkingService.GetVehicles()[0], newParkingService.GetVehicles()[0]);
}