def setUp(self):
        self.now = now()
        self.month_ago = self.now - timedelta(days=30)
Return a boolean indicating if ``value`` is a member of set ``key``
dataset/ETHPy150Open ofa/connect/open_connect/mailer/tests/test_tasks.py/TestWipeOldEmailOpens.setUp--crossover with--dataset/ETHPy150Open gmr/mredis/mredis/client.py/MRedis.sismember