code: def test_backcompat_prefix_works(self, mock_client, uri):
      with patch.dict(os.environ, {"AIRFLOW_CONN_MY_CONN": uri}):
          hook = SalesforceHook("my_conn")
          hook.get_conn()
          mock_client.assert_called_with(
              client_id=None,
              consumer_key=None,
              domain="domain",
              instance=None,
              instance_url=None,
              organizationId=None,
              password=None,
              privatekey=None,
              privatekey_file=None,
              proxies=None,
              security_token="token",
              session=None,
              session_id=None,
              username=None,
              version=mock.ANY,
          )
  
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 19 for calling the TestSalesforceHook obj's underlying member method code with example usage: obj.test_backcompat_prefix_works(mock_client, uri) without return types