docstr: Tests that `get_checkpoint_dirpaths` returns
  the sorted checkpoint directories correctly
docstr_tok: ["Tests","that","`","get_checkpoint_dirpaths","`","returns","the","sorted","checkpoint","directories","correctly"]
code: def test_get_checkpoint_dirpaths(self) -> None:
      """
      Tests that `get_checkpoint_dirpaths` returns
      the sorted checkpoint directories correctly
      """
      with tempfile.TemporaryDirectory() as temp_dir:
          path1 = os.path.join(temp_dir, "epoch_1_step_20")
          path2 = os.path.join(temp_dir, "epoch_4_step_130")
          path3 = os.path.join(temp_dir, "epoch_0_step_10")
          os.mkdir(path1)
          os.mkdir(path2)
          os.mkdir(path3)
  
          self.assertEqual(
              get_checkpoint_dirpaths(temp_dir),
              [path3, path1, path2],  # sorted by epoch and step
          )
  
      with tempfile.TemporaryDirectory() as temp_dir:
          self.assertEqual(
              get_checkpoint_dirpaths(temp_dir),
              [],
          )
  
imports: import os
  import shutil
  import tempfile
  import unittest
  import torch
  import torch.distributed
  from torch import nn
  from torch.distributed import launcher
  from torchsnapshot import Snapshot
  from torchsnapshot.snapshot import SNAPSHOT_METADATA_FNAME
  from torchtnt.framework._test_utils import DummyTrainUnit, get_dummy_train_state
  from torchtnt.framework.callbacks._checkpoint_utils import _delete_checkpoint, _metadata_exists, _prepare_app_state_for_checkpoint, _retrieve_checkpoint_dirpaths, get_checkpoint_dirpaths, get_latest_checkpoint_path, rank_zero_read_and_broadcast
  from torchtnt.utils.distributed import get_global_rank, PGWrapper
  from torchtnt.utils.env import init_from_env
  from torchtnt.utils.fsspec import get_filesystem
  from torchtnt.utils.test_utils import get_pet_launch_config, spawn_multi_process
label_desc: Use image node_id 8 for calling the CheckpointUtilsTest obj's underlying member method code with example usage: obj.test_get_checkpoint_dirpaths() without return types