code: def test_should_update_variable(self, session):
      Variable.set("var1", "foo")
      response = self.client.patch(
          "/api/v1/variables/var1",
          json={
              "key": "var1",
              "value": "updated",
          },
          environ_overrides={"REMOTE_USER": "test"},
      )
      assert response.status_code == 200
      assert response.json == {
          "key": "var1",
          "value": "updated",
          "description": None,
      }
      _check_last_log(
          session,
          dag_id=None,
          event="variable.edit",
          execution_date=None,
      )
  
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 1 for calling the TestPatchVariable obj's underlying member method code with example usage: obj.test_should_update_variable(session) without return types