def test_remove(self):
dll = Doublellist()
dll.add_last(1)
dll.add_last(2)
dll.add_last(1)
dll.remove(1)
self.assertEqual(dll.first(), 2)
self.assertEqual(dll.last(), 1)
def test_change_all(self):
dll = Doublellist()
dll.add_last(1)
dll.add_last(2)
dll.add_last(1)
dll.change_all(1, 0)
self.assertEqual(dll.first(), 0)
self.assertEqual(dll.last(), 0)
def test_remove_all(self):
dll = Doublellist()
dll.add_last(1)
dll.add_last(2)
dll.add_last(1)
dll.remove_all(1)
self.assertEqual(dll.last(), 2)
self.assertEqual(len(dll), 1)
def test_search(self):
dll = Doublellist()
self.assertFalse(1 in dll)
dll.add_first(1)
self.assertTrue(1 in dll)
def test_insert_after(self):
dll = Doublellist()
dll.add_first(1)
dll.insert_after(1, 2)
self.assertEqual(dll.last(), 2)
def test_addlast(self):
dll = Doublellist()
dll.add_last(1)
self.assertEqual(dll.last(), 1)
def test_addfirst(self):
dll = Doublellist()
dll.add_first(1)
self.assertEqual(dll.first(), 1)
def test_init(self):
dll = Doublellist()
self.assertEqual(str(dll), "Header->Tailer")
self.assertEqual(len(dll), 0)
self.assertEqual(dll.is_empty(), True)