def test_effect_of_strategy(self):
        self.responses_test([C, C, C], [D, D, D], [D])
        self.responses_test([C, C, D, D], [D, D, D, C], [C])
Will defect only when last two turns of opponent were defections.
dataset/ETHPy150Open Axelrod-Python/Axelrod/axelrod/tests/unit/test_titfortat.py/TestTitFor2Tats.test_effect_of_strategy