docstr: Test `_format_size` formatter.
docstr_tok: ["Test","`","_format_size","`","formatter","."]
code: def test_format_size(self) -> None:
      """Test `_format_size` formatter."""
      for size, expected in self.SIZES.items():
          self.assertEqual(
              _format_size(size),
              expected,
              msg=f"Wrong formatting for {size} == '{expected}'",
          )
  
imports: import os
  import tempfile
  import time
  import unittest
  from pathlib import Path
  from unittest.mock import Mock
  import pytest
  from huggingface_hub._snapshot_download import snapshot_download
  from huggingface_hub.commands.scan_cache import ScanCacheCommand
  from huggingface_hub.utils import DeleteCacheStrategy, HFCacheInfo, capture_output, scan_cache_dir
  from huggingface_hub.utils._cache_manager import CacheNotFound, _format_size, _format_timesince, _try_delete_path
  from .testing_constants import TOKEN
  from .testing_utils import rmtree_with_retry, with_production_testing, xfail_on_windows
label_desc: Use image node_id 1 for calling the TestStringFormatters obj's underlying member method code with example usage: obj.test_format_size() without return types