code: def setup_class(cls):
      cls.dag = DAG(
          "test_dag",
          default_args={"owner": "airflow", "start_date": DEFAULT_DATE},
      )
      cls.base_sensor = RdsBaseSensor(
          task_id="test_task", aws_conn_id="aws_default", dag=cls.dag
      )
  
imports: from __future__ import annotations
  from moto import mock_rds
  from airflow.models import DAG
  from airflow.providers.amazon.aws.hooks.rds import RdsHook
  from airflow.providers.amazon.aws.sensors.rds import RdsBaseSensor, RdsDbSensor, RdsExportTaskExistenceSensor, RdsSnapshotExistenceSensor
  from airflow.providers.amazon.aws.utils.rds import RdsDbType
  from airflow.utils import timezone
label_desc: Use image node_id 1 for calling the TestBaseRdsSensor obj's underlying member method code with example usage: obj.setup_class(cls) without return types