code: def test_read_file_with_revision(self):
      with self.hffs.open(
          self.hf_path + "/data/binary_data_for_pr.bin",
          "rb",
          revision="refs/pr/1",
      ) as f:
          self.assertEqual(f.read(), b"dummy binary data on pr")
  
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 10 for calling the HfFileSystemTests obj's underlying member method code with example usage: obj.test_read_file_with_revision() without return types