def METHOD_NAME(self):
    test_node = listener.nodes.ParentNode('testing')
    self.n.add_child(test_node)
    self.assertIsInstance(self.n.accessor(['testing'], None, None, None), listener.nodes.ParentNode)
    self.assertIsInstance(self.n.accessor(['nonexistent'], None, None, None), listener.nodes.DoesNotExistNode)