def test_is_any_diagonal_complete(self): ttb = TicTacToeBoard() self.assertFalse(ttb.is_diagonal_complete()) ttb.markX(0, 0) ttb.markX(1, 1) ttb.markX(2, 2) self.assertTrue(ttb.is_diagonal_complete()) ttb.markO(1, 1) self.assertFalse(ttb.is_diagonal_complete())