code: def test_get_file_init_method(self) -> None:
      world_size = 10
      rank = 2
      my_filename = "/tmp/my_filename"
      init_method = get_file_init_method(
          world_size=world_size, rank=rank, filename=my_filename
      )
      url = urlparse(init_method)
      self.assertEqual(url.scheme, "file")
      self.assertEqual(url.netloc, "")
      self.assertEqual(url.path, my_filename)
      url_qs = parse_qs(url.query)
      self.assertIn("world_size", url_qs)
      self.assertEqual(url_qs["world_size"], [str(world_size)])
      self.assertIn("rank", url_qs)
      self.assertEqual(url_qs["rank"], [str(rank)])
  
      world_size = 2
      rank = 0
      # get temp filename
      init_method = get_file_init_method(
          world_size=world_size, rank=rank, filename=None
      )
      url = urlparse(init_method)
      self.assertEqual(url.scheme, "file")
      self.assertEqual(url.netloc, "")
      self.assertNotEqual(url.path, "")
      self.assertFalse(os.path.exists(url.path))
      url_qs = parse_qs(url.query)
      self.assertIn("world_size", url_qs)
      self.assertEqual(url_qs["world_size"], [str(world_size)])
      self.assertIn("rank", url_qs)
      self.assertEqual(url_qs["rank"], [str(rank)])
  
      world_size = 1
      rank = 0
      # get temp filename (default)
      init_method = get_file_init_method(
          world_size=world_size, rank=rank
      )
      url = urlparse(init_method)
      self.assertEqual(url.scheme, "file")
      self.assertEqual(url.netloc, "")
      self.assertNotEqual(url.path, "")
      self.assertFalse(os.path.exists(url.path))
      url_qs = parse_qs(url.query)
      self.assertIn("world_size", url_qs)
      self.assertEqual(url_qs["world_size"], [str(world_size)])
      self.assertIn("rank", url_qs)
      self.assertEqual(url_qs["rank"], [str(rank)])
  
imports: import os
  import unittest
  from typing import Literal, Optional, Union
  from unittest.mock import MagicMock, patch
  from urllib.parse import parse_qs, urlparse
  import torch
  import torch.distributed
  import torch.distributed.launcher
  from pyre_extensions import none_throws
  from torchtnt.utils.distributed import _validate_global_rank_world_size, all_gather_tensors, destroy_process_group, get_file_init_method, get_global_rank, get_local_rank, get_local_world_size, get_process_group_backend_from_device, get_tcp_init_method, get_world_size, PGWrapper, rank_zero_fn, revert_sync_batchnorm, sync_bool
  from torchtnt.utils.test_utils import get_pet_launch_config
label_desc: Use image node_id 31 for calling the DistributedTest obj's underlying member method code with example usage: obj.test_get_file_init_method() without return types