def METHOD_NAME(self):
    store = self.get_store(serialization_format="firehose_v1")
    store.configured = True
    event = self.build_login_event()
    with self.assertRaises(RuntimeError) as cm:
        list(store.bulk_store([event]))
    self.assertEqual(cm.exception.args[0], "bulk_store is not available when batch_size < 2")