code: def test_should_raises_401_unauthenticated(self):
      response = self.client.post(
          "api/v1/pools", json={"name": "test_pool_a", "slots": 3}
      )
  
      assert_401(response)
  
imports: from __future__ import annotations
  import pytest
  from airflow.api_connexion.exceptions import EXCEPTIONS_LINK_MAP
  from airflow.models.pool import Pool
  from airflow.security import permissions
  from airflow.utils.session import provide_session
  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_pools
label_desc: Use image node_id 4 for calling the TestPostPool obj's underlying member method code with example usage: obj.test_should_raises_401_unauthenticated() without return types