public void RemoveTest()
{
DateTime now = ClockProxy.Clock.Now;
SchoolDay schoolDay = new SchoolDay( now );
TimePeriodCollection timePeriods = new TimePeriodCollection();
Assert.IsFalse( timePeriods.Contains( schoolDay.Lesson1 ) );
timePeriods.Add( schoolDay.Lesson1 );
Assert.IsTrue( timePeriods.Contains( schoolDay.Lesson1 ) );
timePeriods.Remove( schoolDay.Lesson1 );
Assert.IsFalse( timePeriods.Contains( schoolDay.Lesson1 ) );
}