def test_cast_linked_list_to_list(self):
linked_list = LinkedList()
third = Node(3)
second = Node(2, third)
first = Node(1, second)
linked_list.head = first
assert linked_list.to_list() == [1, 2, 3]
def test_create_linked_list_with_three_nodes(self):
linked_list = LinkedList()
linked_list.head = Node(1)
second = Node(2)
third = Node(3)
assert linked_list.head.data == 1
assert not linked_list.head.next
assert not second.next
assert not third.next
linked_list.head.next = second
second.next = third
assert linked_list.head.next.data == 2
assert linked_list.head.next.next.key == 3
assert not linked_list.head.next.next.next
