def test_length(self):
ll = DoublyLinkedList()
assert ll.length() == 0
ll.append('A')
assert ll.length() == 1
ll.append('B')
assert ll.length() == 2
ll.append('C')
assert ll.length() == 3
def test_length(self):
dll = DoublyLinkedList()
assert dll.length() == 0
dll.append('A')
assert dll.length() == 1
dll.append('B')
assert dll.length() == 2
dll.append('C')
assert dll.length() == 3
def test_length_after_prepend(self):
dll = DoublyLinkedList()
assert dll.length() == 0
# Prepend should increase length
dll.prepend('C')
assert dll.length() == 1
dll.prepend('B')
assert dll.length() == 2
dll.prepend('A')
assert dll.length() == 3
def test_length_after_append_and_prepend(self):
dll = DoublyLinkedList()
assert dll.length() == 0
# Append and prepend should increase length
dll.append('C')
assert dll.length() == 1
dll.prepend('B')
assert dll.length() == 2
dll.append('D')
assert dll.length() == 3
dll.prepend('A')
assert dll.length() == 4
def test_delete(self):
dll = DoublyLinkedList()
dll.append('L')
dll.append('K')
dll.append('G')
dll.delete('L')
assert dll.head.data == 'K'
assert dll.tail.data == 'G'
assert dll.length() == 2
print(dll)
dll.delete('K')
assert dll.head.data == 'G'
assert dll.tail.data == 'G'
assert dll.length() == 1
def test_length(self):
ll = DoublyLinkedList()
assert ll.length() == 0
# append and prepend operations increase length
ll.append('B')
assert ll.length() == 1
ll.prepend('A')
assert ll.length() == 2
ll.append('C')
assert ll.length() == 3
# delete operations decrease length
ll.delete('B')
assert ll.length() == 2
ll.delete('C')
assert ll.length() == 1
ll.delete('A')
assert ll.length() == 0
def test_length_after_delete(self):
dll = DoublyLinkedList(['A', 'B', 'C', 'D', 'E'])
assert dll.length() == 5
# Delete should decrease length
dll.delete('A')
assert dll.length() == 4
dll.delete('E')
assert dll.length() == 3
dll.delete('C')
assert dll.length() == 2
dll.delete('D')
assert dll.length() == 1
dll.delete('B')
assert dll.length() == 0
def test_length(self):
dll = DoublyLinkedList()
assert dll.length() == 0
dll.append('L')
dll.append('K')
assert dll.length() == 2
