def test_quadruple(self):
my_list = LinkedListNode.from_list([1, 3, 5, 7])
self.assertEqual(my_list.midpoint(), 3)
def test_single(self):
my_list = LinkedListNode.from_list([42])
self.assertEqual(my_list.midpoint(), 42)
def test_double(self):
my_list = LinkedListNode.from_list([1, 3])
self.assertEqual(my_list.midpoint(), 1)
