def test_insert_empty():
doubly_linked_list = DoublyLinkedList()
doubly_linked_list.insert(3, 0)
assert doubly_linked_list.size() == 1
assert doubly_linked_list.get(0) == 3
def test_get_node():
doubly_linked_list = DoublyLinkedList()
doubly_linked_list.insert(3, 0)
assert doubly_linked_list.get_node(0).data == 3