def test_delete_non_existing(self):
list = DoublyLinkedList()
list.insertLast(1, {"a": 1})
list.insertLast(2, {"b": 2})
list.insertAfter(2, 3, {"c": 3})
self.assertEqual(list.delete(4), None)
self.assertEqual(len(list.array()), 3)
def test_delete_last_existing(self):
list = DoublyLinkedList()
list.insertLast(1, {"a": 1})
list.insertLast(2, {"b": 2})
list.insertAfter(2, 3, {"c": 3})
self.assertEqual(list.deleteLast().data['c'], 3)
self.assertEqual(len(list.array()), 2)
def test_insert_after2(self):
list = DoublyLinkedList()
list.insertLast(1, {"a": 1})
list.insertLast(2, {"b": 2})
list.insertAfter(2, 3, {"c": 3})
self.assertEqual(len(list.array()), 3)
self.assertEqual(list.first.key, 1)
self.assertEqual(list.first.next.key, 2)
self.assertEqual(list.last.key, 3)
def test_insert_first(self):
list = DoublyLinkedList()
list.insertFirst(1, {"a": 1})
list.insertFirst(2, {"b": 2})
list.insertFirst(3, {"c": 3})
list.insertFirst(4, {"d": 4})
self.assertEqual(len(list.array()), 4)
self.assertEqual(list.first.key, 4)
self.assertEqual(list.last.key, 1)
class ListDeque:
# TODO limit size
def __init__(self, size=0):
self.list_obj = DoublyLinkedList()
# top of the stack is
def list(self):
return [link.key for link in self.list_obj.array()]
def isEmpty(self):
return self.list_obj.isEmpty()
def insert(self, key):
self.list_obj.insertLast(key, None)
def push(self, key):
self.list_obj.insertFirst(key, None)
def remove(self):
if self.isEmpty():
raise ValueError("Removing from empty deque")
return self.list_obj.deleteFirst().key
def pop(self):
if self.isEmpty():
raise ValueError("Popping from empty deque")
return self.list_obj.deleteLast().key
def head(self):
if self.isEmpty():
raise ValueError("Reading head from empty deque")
return self.list_obj.first.key
def peek(self):
if self.isEmpty():
raise ValueError("Peeking from empty deque")
return self.list_obj.last.key
class TestDoublyLinkedList(unittest.TestCase):
def setUp(self):
self.my_list = DoublyLinkedList()
def test_basic_initialization_and_repr(self):
self.assertEqual(repr(self.my_list), '[]')
def test_append(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(repr(self.my_list), '[4, 3, 7, -17]')
def test_prepend(self):
self.my_list.prepend(4)
self.my_list.prepend(3)
self.my_list.prepend(7)
self.my_list.prepend(-17)
self.assertEqual(repr(self.my_list), '[-17, 7, 3, 4]')
def test_insert_after(self):
self.my_list.insert_after(None, 4)
self.my_list.insert_after(None, 3)
self.my_list.insert_after(self.my_list.tail, 7)
self.my_list.insert_after(self.my_list.head, -17)
self.assertEqual(repr(self.my_list), '[3, -17, 4, 7]')
def test_insert_sorted(self):
self.my_list.insert_after(None, 4)
self.my_list.insert_after(None, 3)
self.my_list.insert_after(None, 7)
self.assertEqual(repr(self.my_list), '[7, 3, 4]')
self.my_list.insert_sorted(2)
self.my_list.insert_sorted(8)
self.assertEqual(repr(self.my_list), '[2, 7, 3, 4, 8]')
self.my_list.remove(self.my_list.head)
self.my_list.remove(self.my_list.head)
self.my_list.remove(self.my_list.head)
self.my_list.remove(self.my_list.head)
self.my_list.remove(self.my_list.head)
self.my_list.insert_sorted(8)
self.my_list.insert_sorted(7)
self.my_list.insert_sorted(6)
self.my_list.insert_sorted(5)
self.assertEqual(repr(self.my_list), '[5, 6, 7, 8]')
def test_remove(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(repr(self.my_list), '[4, 3, 7, -17]')
self.my_list.remove(self.my_list.head)
self.assertEqual(repr(self.my_list), '[3, 7, -17]')
self.my_list.remove(self.my_list.head.next)
self.assertEqual(repr(self.my_list), '[3, -17]')
self.my_list.remove(self.my_list.tail)
self.assertEqual(repr(self.my_list), '[3]')
self.my_list.remove(self.my_list.head)
self.my_list.remove(self.my_list.head)
self.assertEqual(repr(self.my_list), '[]')
def test_array(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(self.my_list.array(), [4, 3, 7, -17])
def test_reverse_array(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(self.my_list.reverse_array(), [-17, 7, 3, 4])
def test_search(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(-17)
self.my_list.append(7)
self.assertEqual(self.my_list.search(4).data, 4)
self.assertEqual(self.my_list.search(3).data, 3)
self.assertEqual(self.my_list.search(-17).data, -17)
self.assertEqual(self.my_list.search(17), None)
def test_reverse(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(repr(self.my_list), '[4, 3, 7, -17]')
self.my_list.reverse()
self.assertEqual(repr(self.my_list), '[-17, 7, 3, 4]')
self.my_list.reverse()
self.assertEqual(repr(self.my_list), '[4, 3, 7, -17]')
def test_remove_duplicates(self):
self.my_list.append(4)
self.my_list.append(3)
self.my_list.append(3)
self.my_list.append(3)
self.my_list.append(7)
self.my_list.append(-17)
self.assertEqual(repr(self.my_list), '[4, 3, 3, 3, 7, -17]')
self.my_list.remove_duplicates()
self.assertEqual(repr(self.my_list), '[4, 3, 7, -17]')
