code: def test_get_conn_exists(self):
      self.salesforce_hook.conn = Mock(spec=Salesforce)
  
      self.salesforce_hook.get_conn()
  
      assert self.salesforce_hook.conn.return_value is not None
  
imports: from __future__ import annotations
  import os
  from unittest import mock
  from unittest.mock import Mock, patch
  import numpy
  import pandas
  import pytest
  from requests import Session
  from simple_salesforce import Salesforce, api
  from airflow.models.connection import Connection
  from airflow.providers.salesforce.hooks.salesforce import SalesforceHook
  from airflow.utils.session import create_session
label_desc: Use image node_id 3 for calling the TestSalesforceHook obj's underlying member method code with example usage: obj.test_get_conn_exists() without return types