code: def test_concat_url(base, subpath, expected_result):
      assert endpoint_utils.concat_url(base, subpath) == expected_result
  
file_path: rasa/tests/utils/test_endpoints.py
imports: import logging
  from pathlib import Path
  from typing import Text, Optional, Union
  from unittest.mock import Mock
  import pytest
  from aioresponses import aioresponses
  from rasa.shared.exceptions import FileNotFoundException
  from tests.utilities import latest_request, json_of_latest_request
  import rasa.utils.endpoints
label_desc: Use image node_id 1 for calling a global function with example usage: test_concat_url(base, subpath, expected_result) without return types