def test_remove_2(self):
a = Node(1)
for i in range(2, 9):
a = Node.insert(a, i)
self.assertEqual(True, Node.containskey(a, 6))
a = Node.remove(a, 6)
self.assertEqual(False, Node.containskey(a, 6))
def test_contains_none(self):
a = Node(1)
for i in range(3, 9):
a = Node.insert(a, i)
self.assertEqual(False, Node.containskey(None, 2))
def test_contains_true(self):
a = Node(1)
for i in range(3, 9):
a = Node.insert(a, i)
self.assertEqual(True, Node.containskey(a, 6))