public void SingleOoCollectionTest()
{
var start = new DateTime(2020, 09, 18, 15, 30, 00);
var slot = new Timeslot {
CalendarId = 1, StartDateTime = start, EndDateTime = start.AddDays(2), TeacherId = 1
};
var slotList = slot.DetermineSingleOrCollectionTimeslots();
Assert.IsTrue(slotList.Count == 1);
}