def test_append_several():
ll = LinkedList()
ll.append(1)
ll.append(2)
ll.append(3)
assert ll.includes(3)
assert str(ll) == '{ 1 } -> { 2 } -> { 3 } -> NULL'
def test_append_node_to_list():
link_list = LinkedList()
link_list.insert('b')
link_list.insert('c')
link_list.append('a')
actual = str(link_list)
expected = "{c}->{b}->{a}->NULL"
assert actual == expected
def test_insert_before_middle():
link_list = LinkedList()
link_list.insert('c')
link_list.insert('d')
link_list.append('b')
link_list.append('a')
link_list.insertBefore('b', 'yasss')
actual = str(link_list)
expected = "{d}->{c}->{yasss}->{b}->{a}->NULL"
assert actual == expected
def test_insert_after_last():
link_list = LinkedList()
link_list.insert('c')
link_list.insert('d')
link_list.append('b')
link_list.append('a')
link_list.insertAfter('a', 'yasss')
actual = str(link_list)
expected = "{d}->{c}->{b}->{a}->{yasss}->NULL"
assert actual == expected
def test_same_size_lists():
list1 = LinkedList()
list1.append(1)
list1.append(2)
list1.append(3)
list2 = LinkedList()
list2.append(4)
list2.append(5)
list2.append(6)
actual = str(zipLists(list1, list2))
expected = "{1}->{4}->{2}->{5}->{3}->{6}->NULL"
assert actual == expected
def test_list1_longer_plus():
list1 = LinkedList()
list1.append(1)
list1.append(2)
list1.append(3)
list1.append(7)
list1.append(8)
list2 = LinkedList()
list2.append(4)
list2.append(5)
actual = str(zipLists(list1, list2))
expected = "{1}->{4}->{2}->{5}->{3}->{7}->{8}->NULL"
assert actual == expected
def test_append_empty():
ll = LinkedList()
ll.append('test')
assert str(ll.head) == "test"