code: def test_is_windows(self, mock_system: MagicMock) -> None:
      mock_system.return_value = "Linux"
      self.assertFalse(version.is_windows())
  
      mock_system.return_value = "Darwin"
      self.assertFalse(version.is_windows())
  
      mock_system.return_value = "Windows"
      self.assertTrue(version.is_windows())
  
file_path: tnt/tests/utils/test_version.py
imports: import unittest
  from unittest.mock import MagicMock, patch
  import torch
  from packaging.version import Version
  from torchtnt.utils import version
label_desc: Use image node_id 1 for calling the TestVersion obj's underlying member method code with example usage: obj.test_is_windows(mock_system) without return types