def test_right_append(self):
ll = LinkedList()
ll.right_append(5)
ll.right_append(7)
self.assertEqual(ll.head.data, 5)
self.assertEqual(ll.head.pointer_next.data, 7)
self.assertIsNone(ll.head.pointer_next.pointer_next)
def test__iter__(self):
ll = LinkedList()
ll.right_append(100)
ll.right_append(99)
ll.left_append(0)
iterator = iter(ll)
self.assertEqual(next(iterator), 0)
self.assertEqual(next(iterator), 100)
self.assertEqual(next(iterator), 99)
self.assertRaises(StopIteration, next, iterator)
def test_right_append_empty_list(self):
ll = LinkedList()
ll.right_append(700)
self.assertEqual(ll.head.data, 700)
self.assertIsNone(ll.head.pointer_next)
def test__contains__(self):
ll = LinkedList()
ll.right_append(3)
ll.right_append(5)
self.assertEqual(ll.__contains__(3), True)
self.assertEqual(ll.__contains__(10), False)