public void FindOpenSites()
{
//arrange
ReservationSqlDAO reservationDAO = new ReservationSqlDAO(connectionString);
DateTime selectedFromDate = Convert.ToDateTime("2019 - 01 - 01");
DateTime selectedToDate = Convert.ToDateTime("2019 - 12 - 31");
int selectedCampgroundID = 1;
//act
IList <Site> sites = reservationDAO.FindOpenSites(selectedCampgroundID, selectedFromDate, selectedToDate);
int actualResult = sites.Count;
//assert
Assert.AreEqual(actualResult, 5);
}