code: def test_get_conn_returns_a_boto3_connection(self):
      hook = SecretsManagerHook(aws_conn_id="aws_default")
      assert hook.get_conn() is not None
  
file_path: airflow/tests/providers/amazon/aws/hooks/test_secrets_manager.py
imports: from __future__ import annotations
  import base64
  import json
  from moto import mock_secretsmanager
  from airflow.providers.amazon.aws.hooks.secrets_manager import SecretsManagerHook
label_desc: Use image node_id 1 for calling the TestSecretsManagerHook obj's underlying member method code with example usage: obj.test_get_conn_returns_a_boto3_connection() without return types