Itenso.TimePeriod.TimePeriodCollection.Contains C# (CSharp) Method

        public virtual bool Contains( ITimePeriod item )
        {
            if ( item == null )
            {
                throw new ArgumentNullException( "item" );
            }
            return periods.Contains( item );
        }

        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 ) );
        }