def test_index_of_student_student_present(self):
test_class = ClassList(3)
test_class.add_student('Harry')
test_class.add_student('Hermione')
test_class.add_student('Ron')
self.assertIsNotNone(test_class.index_of_student('Harry'))
def test_student_not_in_list(self):
test_class = ClassList(2)
test_class.add_student('Taylor Swift')
test_class.add_student('Kanye West')
self.assertIsNone(test_class.index_of_student('Jim Beam'))