/** Test of finding reserved rooms at specific time */
  @Test
  public void findReservedRoomsAtSpecificTimeTest() {

    List<Reservation> list = new ArrayList<>();
    list.add(reservation1);
    list.add(reservation2);

    when(reservationDao.findReservationsOfTime(any(Date.class), any(Date.class))).thenReturn(list);
    List<Room> reservedRooms =
        roomService.findReservedRoomsAtSpecificTime(nextMonthFirstDay, nextMonthLastDay);

    verify(reservationDao).findReservationsOfTime(any(Date.class), any(Date.class));
    assertTrue(reservedRooms.contains(room1));
    assertTrue(reservedRooms.contains(room2));
  }