code: def test_conn_not_none(self):
      assert self.hook.conn is not None
  
file_path: airflow/tests/providers/amazon/aws/hooks/test_elasticache_replication_group.py
imports: from __future__ import annotations
  from unittest.mock import Mock
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.providers.amazon.aws.hooks.elasticache_replication_group import ElastiCacheReplicationGroupHook
label_desc: Use image node_id 3 for calling the TestElastiCacheReplicationGroupHook obj's underlying member method code with example usage: obj.test_conn_not_none() without return types