public void SearchReservationsTest()
      {
          DateTime fromDate = DateTime.Parse("2020-08-10");
          DateTime toDate   = DateTime.Parse("2020-08-11");

          ReservationSqlDAO   reservationSql = new ReservationSqlDAO(connectionString);
          IList <Reservation> reservations   = new List <Reservation>();

          reservations = reservationSql.SearchReservations("1", fromDate, toDate);
          Assert.IsTrue(reservations.Count > 0);
      }