code: def test_list_files_ignores_hidden_files(tmpdir):
      # create a hidden file
      open(os.path.join(tmpdir.strpath, ".hidden"), "a").close()
      # create a normal file
      normal_file = os.path.join(tmpdir.strpath, "normal_file")
      open(normal_file, "a").close()
      assert rasa.shared.utils.io.list_files(tmpdir.strpath) == [
          normal_file
      ]
  
file_path: rasa/tests/nlu/test_utils.py
imports: import os
  import pickle
  import pytest
  import tempfile
  import shutil
  from typing import Text
  import rasa.shared.nlu.training_data.message
  import rasa.shared.utils.io
  from rasa.nlu import utils
label_desc: Use image node_id 5 for calling a global function with example usage: test_list_files_ignores_hidden_files(tmpdir) without return types