def test_two_node_tree(self):
root = Node(None, None)
child = root.add_child("move")
self.assertTrue(root.is_root())
self.assertFalse(root.is_leaf())
self.assertFalse(child.is_root())
self.assertTrue(child.is_leaf())
self.assertIs(child.parent(), root)
self.assertEqual(child.action(), "move")
def test_single_node_tree(self):
n = Node(None, None)
self.assertTrue(n.is_root())
self.assertTrue(n.is_leaf())