def test_delete(self):
ll = LinkedList(['A', 'B', 'C'])
ll.delete('A')
assert ll.head.data == 'B'
assert ll.tail.data == 'C'
ll.delete('C')
assert ll.head.data == 'B'
assert ll.tail.data == 'B'
ll.delete('B')
assert ll.head is None
assert ll.tail is None
with self.assertRaises(ValueError):
ll.delete('D')
third = Node(3)
llist.head.next = second;
second.next = third;
# intial Linked List
llist.printList()
# Inserting node at the front
llist.push(0)
# updating the Linked List
print("new updated list after adding element at the stating of the list")
llist.printList()
# Inserting element after specific element
llist.insertAfterData(2, 4)
print("updated linked list after insertion after the given node")
llist.printList()
llist.insertAfterNode(second, 5)
print("updated linked list after insertion after the given node")
llist.printList()
llist.append(6)
print("updated list after appending data")
llist.printList()
llist.delete(9)
print("updated list after deleting an element")
llist.printList()