code: def test_list_root_directory_no_revision_no_detail_then_with_detail(
      self,
  ):
      files = self.hffs.ls(self.hf_path, detail=False)
      self.assertEqual(len(files), 2)
      self.assertTrue(
          files[0].endswith("/data")
          and files[1].endswith("/.gitattributes")
      )
      self.assertIsNone(
          self.hffs.dircache[self.hf_path][0]["last_commit"]
      )  # no detail -> no last_commit in cache
  
      files = self.hffs.ls(self.hf_path, detail=True)
      self.assertEqual(len(files), 2)
      self.assertTrue(
          files[0]["name"].endswith("/data")
          and files[1]["name"].endswith("/.gitattributes")
      )
      self.assertIsNotNone(
          self.hffs.dircache[self.hf_path][0]["last_commit"]
      )
  
imports: import datetime
  import unittest
  from typing import Optional
  from unittest.mock import patch
  import fsspec
  import pytest
  from huggingface_hub.hf_file_system import HfFileSystem
  from huggingface_hub.utils import RepositoryNotFoundError, RevisionNotFoundError
  from .testing_constants import ENDPOINT_STAGING, TOKEN
  from .testing_utils import repo_name
label_desc: Use image node_id 21 for calling the HfFileSystemTests obj's underlying member method code with example usage: obj.test_list_root_directory_no_revision_no_detail_then_with_detail() without return types