code: def test_get_conn(self):
      assert self.hook.connection.port == 27017
      assert isinstance(self.conn, pymongo.MongoClient)
  
imports: from __future__ import annotations
  import importlib
  from typing import TYPE_CHECKING
  import pymongo
  import pytest
  from airflow.models import Connection
  from airflow.providers.mongo.hooks.mongo import MongoHook
  from airflow.utils import db
label_desc: Use image node_id 2 for calling the TestMongoHook obj's underlying member method code with example usage: obj.test_get_conn() without return types