def METHOD_NAME(self):
    store = self.get_store(serialization_format="firehose_v1")
    store.configured = True
    mock_client = Mock()
    mock_client.put_record.return_value = "TEST RETURN VALUE"
    store.client = mock_client
    event = self.build_login_event()
    self.assertEqual(store.store(event), "TEST RETURN VALUE")
    mock_client.put_record.assert_called_once()