def test_get_successor(self):
n1 = Node(2)
n2 = Node(3)
n3 = Node(4)
n1.add_left(n2)
n2.add_right(n3)
self.assertEqual(n3.getSuccessor(), n1)
def test_get_successor_basic(self):
n1 = Node(2)
n2 = Node(3)
n1.add_left(n2)
self.assertEqual(n2.getSuccessor(), n1)
def test_get_successor_basic_2(self):
n1 = Node(2)
n2 = Node(3)
n1.add_right(n2)
self.assertEqual(n1.getSuccessor(), n2)
def test_get_successor_None(self):
n1 = Node(2)
self.assertIsNone(n1.getSuccessor())
