def test_linked_list_append():
ll = LinkedList()
ll.head = Node(1)
ll.head.next = Node(2)
ll.append(3)
assert ll.head.next.next.value == 3
assert ll.head.next.next.next == None
def test_linked_list_append():
"""Test a value can be appended to a linked list."""
linked_list = LinkedList()
value = 1
linked_list.insert(value)
value = 2
linked_list.append(value)
assert linked_list.head.next.value == value
assert linked_list.head.next.next == None
value = 3
linked_list.append(value)
assert linked_list.head.next.next.value == value
assert linked_list.head.next.next.next == None