from linked_list import LinkedList

list = LinkedList()
assert list.len() == 0
list.push(123)
assert list.len() == 1
list.push(456)
assert list.len() == 2
list.push(789)
assert list.len() == 3
list.insert(-10, 1)
list.print()
assert list.len() == 4
print(list.len())

print(list.pop())
assert list.len() == 3
print(list.pop())
assert list.len() == 2
print(list.pop())
assert list.len() == 1
print(list.pop())
assert list.len() == 0


# node3 = Node(333)
# node2.next = node3

# print(node1.data, node1.next.data, node2.next)