code: def test_should_raises_401_unauthenticated(self):
      response = self.client.post(
          "/api/v1/variables",
          json={
              "key": "var_create",
              "value": "{}",
          },
      )
  
      assert_401(response)
  
imports: from __future__ import annotations
  import urllib
  import pytest
  from airflow.api_connexion.exceptions import EXCEPTIONS_LINK_MAP
  from airflow.models import Variable
  from airflow.security import permissions
  from tests.test_utils.api_connexion_utils import assert_401, create_user, delete_user
  from tests.test_utils.config import conf_vars
  from tests.test_utils.db import clear_db_variables
  from tests.test_utils.www import _check_last_log
label_desc: Use image node_id 3 for calling the TestPostVariables obj's underlying member method code with example usage: obj.test_should_raises_401_unauthenticated() without return types