public async Task checkOutVehicle()
{
VehiclesController vc = new VehiclesController();
Random random = new Random();
Vehicle[] vehicles = vc.GetVehicles().ToArray <Vehicle>();
if (vehicles.Length > 0)
{
Vehicle vehicle = vehicles[random.Next(0, vehicles.Length - 1)];
IHttpActionResult checkOutResult = await vc.checkOutVehicle(vehicle.LicensePlateID);
IHttpActionResult afterCheckOutVheicle = await vc.GetVehicle(vehicle.LicensePlateID);
Assert.IsNotNull(checkOutResult);
Assert.IsInstanceOfType(checkOutResult, typeof(OkNegotiatedContentResult <Vehicle>));
Assert.IsNotNull((checkOutResult as OkNegotiatedContentResult <Vehicle>).Content);
Assert.IsInstanceOfType(afterCheckOutVheicle, typeof(NotFoundResult));
}
}