def test_reverse_action(self):
self.assertEqual(p.reverse_action((1, 0)), (-1, 0))
self.assertEqual(p.reverse_action((-1, 1)), (1, -1))
self.assertEqual(p.reverse_action((-1, 1, 0)), (1, -1, 0))
def useful_actions(self):
actions = puzzle.possible_actions(self.p)
if len(self.hist) > 0:
actions.remove(puzzle.reverse_action(self.hist[-1]))
return actions
