def METHOD_NAME(self) -> None:
    if self.config.pubsub_emulator_host is not None:
        os.environ['PUBSUB_EMULATOR_HOST'] = self.config.pubsub_emulator_host
    self.subscriber_client = self._get_subscriber_client()
    self.subscription_path = self.subscriber_client.subscription_path(
        self.config.project_id, self.config.subscription_id)
    self._create_subscription(
        self.config.project_id,
        self.config.topic_id,
        self.config.subscription_id)