public void SortByEndTest()
{
DateTime now = ClockProxy.Clock.Now;
SchoolDay schoolDay = new SchoolDay( now );
TimePeriodCollection timePeriods = new TimePeriodCollection();
timePeriods.AddAll( schoolDay );
timePeriods.SortByEnd();
Assert.AreEqual( timePeriods[ 0 ], schoolDay.Lesson4 );
Assert.AreEqual( timePeriods[ 1 ], schoolDay.Break3 );
Assert.AreEqual( timePeriods[ 2 ], schoolDay.Lesson3 );
Assert.AreEqual( timePeriods[ 3 ], schoolDay.Break2 );
Assert.AreEqual( timePeriods[ 4 ], schoolDay.Lesson2 );
Assert.AreEqual( timePeriods[ 5 ], schoolDay.Break1 );
Assert.AreEqual( timePeriods[ 6 ], schoolDay.Lesson1 );
}