def test_remove_after_first_item(self):
dl_list = DoublyLinkedList([1, 2, 3])
with self.assertRaises(DoublyLinkedListError):
dl_list.removeAfterNode(dl_list.lastnode())
def test_remove_after(self):
dl_list = DoublyLinkedList([1, 2, 3])
self.assertEqual(len([i for i in dl_list.items()]), 3)
dl_list.removeAfterNode(dl_list.firstnode())
self.assertEqual(dl_list.firstnode().next().value, 3)
self.assertEqual(len([i for i in dl_list.items()]), 2)
