def test_linkedlist_insert_assignment1():
list_one = Linkedlist()
list_one.head = Node('a')
list_one.head.next = Node('b')
b = Node('b')
c = Node('c')
b.next = c
c.next = None
assert list_one.head.value == 'a'
assert list_one.head.next.value == 'b'
assert b.value == 'b'
assert b.next.value == 'c'
def test_linkedlist_insert():
list_one = Linkedlist()
list_one.insert('apples')
assert list_one.head.value == 'apples'
assert list_one.head.next == None
def test_linkedlist_tostring_one_assignment():
list_one = Linkedlist()
list_one.insert('c')
list_one.insert('b')
list_one.insert('a')
assert list_one.tostring() == '{a} -> {b} -> {c} -> NULL'
def test_linkedlist_includes_f_assignment():
list_one = Linkedlist()
list_one.insert('a')
list_one.insert('b')
assert list_one.includes('dd') == 'false'
def test_linkedlist_includes_assignment():
list_one = Linkedlist()
list_one.insert('a')
list_one.insert('b')
assert list_one.includes('a') == 'true'
def test_linkedlist_create():
list_one = Linkedlist()
assert list_one.head == None
def test_linkedlist_insert_assignment():
list_one = Linkedlist()
list_one.insert('a')
assert list_one.head.value == 'a'
assert list_one.head.next == None
def test_linkedlist_insert_two():
list_one = Linkedlist()
list_one.head = Node('Apples')
list_one.head.next = Node('Banana')
assert list_one.head.value == 'Apples'
assert list_one.head.next.value == 'Banana'