code: def test_to_directory(checkpoint: Checkpoint):
      checkpoint_path = Path(checkpoint.to_directory())
  
      assert (checkpoint_path / _CHECKPOINT_CONTENT_FILE).exists()
      assert _CHECKPOINT_TEMP_DIR_PREFIX in checkpoint_path.name
  
file_path: ray/python/ray/train/tests/test_checkpoint.py
imports: import os
  from pathlib import Path
  import pyarrow.fs
  import pytest
  import ray
  from ray.train._checkpoint import _CHECKPOINT_TEMP_DIR_PREFIX, _METADATA_FILE_NAME, Checkpoint, _get_del_lock_path, _list_existing_del_locks
  from ray.train._internal.storage import _exists_at_fs_path, _upload_to_fs_path
  from ray.train.tests.test_new_persistence import _create_mock_custom_fs
label_desc: Use image node_id 2 for calling a global function with example usage: test_to_directory(checkpoint) without return types