def test_playable_squares():
engine = SuperTicTacToe()
opponent = Monkey()
assert_equal(opponent.playable_squares(engine, 0),
[0,1,2,3,4,5,6,7,8])
engine.move(PLAYER_X, 0, 0)
assert_equal(opponent.playable_squares(engine, 0),
[1,2,3,4,5,6,7,8])