public void UpdateReservationTest()
        {
            using (AutoReservationEntities context = new AutoReservationEntities())
            {
                TestEnvironmentHelper.InitializeTestData();

                AutoReservationBusinessComponent arbc = new AutoReservationBusinessComponent();

                var res = (from reservation in context.Reservationen select reservation).FirstOrDefault().ReservationsNr;

                Reservation reservationOriginal = arbc.GetReservation(res);
                Reservation reservationModified = arbc.GetReservation(res);

                reservationModified.Bis = new System.DateTime(2020, 1, 21);
                arbc.EditReservation(reservationOriginal, reservationModified);

                Assert.AreEqual(reservationOriginal.Bis, reservationModified.Bis, "UpdateReservationTest: Reservationen sind nicht gleich nach Update");
            }
        }