public void ClearTest()
{
TimePeriodChain timePeriods = new TimePeriodChain();
Assert.Equal(0, timePeriods.Count);
timePeriods.Clear();
Assert.Equal(0, timePeriods.Count);
SchoolDay schoolDay = new SchoolDay();
Assert.Equal(7, schoolDay.Count);
schoolDay.Clear();
Assert.Equal(0, schoolDay.Count);
} // ClearTest
