def test__date_range_seconds(self):
        since = datetime.utcnow() - timedelta(seconds=5)
        values = self.r._date_range('seconds', since)
        self.assertEqual(len(list(values)), 5)
Tests ``R._date_range`` at the "seconds" granularity.
dataset/ETHPy150Open bradmontgomery/django-redis-metrics/redis_metrics/tests/test_models.py/TestR.test__date_range_seconds