code: def test_connection_and_client(self):
      hook = AzureBatchHook(azure_batch_conn_id=self.test_vm_conn_id)
      assert isinstance(hook.get_conn(), BatchServiceClient)
      conn = hook.connection
      assert isinstance(conn, BatchServiceClient)
      assert (
          hook.connection is conn
      ), "`connection` property should be cached"
  
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import PropertyMock
  import pytest
  from azure.batch import BatchServiceClient, models
  from airflow.models import Connection
  from airflow.providers.microsoft.azure.hooks.batch import AzureBatchHook
label_desc: Use image node_id 2 for calling the TestAzureBatchHook obj's underlying member method code with example usage: obj.test_connection_and_client() without return types