public void IndexOfTest()
{
SchoolDay schoolDay = new SchoolDay();
Assert.Equal <int>(schoolDay.IndexOf(new TimeRange()), -1);
Assert.Equal <int>(schoolDay.IndexOf(new TimeBlock()), -1);
Assert.Equal(0, schoolDay.IndexOf(schoolDay.Lesson1));
Assert.Equal(1, schoolDay.IndexOf(schoolDay.Break1));
Assert.Equal(2, schoolDay.IndexOf(schoolDay.Lesson2));
Assert.Equal(3, schoolDay.IndexOf(schoolDay.Break2));
Assert.Equal(4, schoolDay.IndexOf(schoolDay.Lesson3));
Assert.Equal(5, schoolDay.IndexOf(schoolDay.Break3));
Assert.Equal(6, schoolDay.IndexOf(schoolDay.Lesson4));
schoolDay.Remove(schoolDay.Lesson1);
Assert.Equal <int>(schoolDay.IndexOf(schoolDay.Lesson1), -1);
} // IndexOfTest
