docstr: Test get_conn() function and check whether the get_conn() function returns value
  is instance of ServiceBusClient
docstr_tok: ["Test","get_conn","(",")","function","and","check","whether","the","get_conn","(",")","function","returns","value","is","instance","of","ServiceBusClient"]
code: def test_get_service_bus_message_conn(self):
      """
      Test get_conn() function and check whether the get_conn() function returns value
      is instance of ServiceBusClient
      """
      hook = MessageHook(azure_service_bus_conn_id=self.conn_id)
      assert isinstance(hook.get_conn(), ServiceBusClient)
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.models import Connection
  from airflow.providers.microsoft.azure.hooks.asb import AdminClientHook, MessageHook
label_desc: Use image node_id 2 for calling the TestMessageHook obj's underlying member method code with example usage: obj.test_get_service_bus_message_conn() without return types