code: def test_version_one_init(self, mock_hvac):
      mock_client = mock.MagicMock()
      mock_hvac.Client.return_value = mock_client
  
      vault_client = _VaultClient(
          auth_type="userpass", kv_engine_version=1
      )
      assert 1 == vault_client.kv_engine_version
  
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import mock_open, patch
  import pytest
  from hvac.exceptions import InvalidPath, VaultError
  from requests import Session
  from requests.adapters import HTTPAdapter
  from urllib3.util import Retry
  from airflow.providers.hashicorp._internal_client.vault_client import _VaultClient
label_desc: Use image node_id 3 for calling the TestVaultClient obj's underlying member method code with example usage: obj.test_version_one_init(mock_hvac) without return types