def test_shift():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList(LIST_INPUT)
assert new_list.shift() == 6
def test_remove():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList(LIST_INPUT)
new_list.remove(9)
new_list.remove(7)
assert new_list.head.data == 8
def test_append_list():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList((4, 5, 65))
new_list.append([45, 'nine', False])
assert new_list.tail.data == [45, 'nine', False]
def test_pop():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList(LIST_INPUT)
new_list.pop()
assert new_list.pop() == 8
def test_append_int():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList((4, 5, 65))
new_list.append(45)
assert new_list.tail.data == 45
def test_insert_str():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList((4, 5, 65))
new_list.insert('dog')
assert new_list.head.data == 'dog'
def test_insert_int():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList((4, 5, 65))
new_list.insert(45)
assert new_list.head.data == 45
def test_linked_node_init_next():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList((3, 4, 5))
assert new_list.head.toward_tail.data == 4
def test_empty_double_linked():
from double_linked import DoubleLinkedList
new_list = DoubleLinkedList()
new_list.insert(999)
assert new_list.shift() == 999
