code: def test_deepspeed_env_variables_on_platforms(
      _, deepspeed_dist_mock, platform
  ):
      """Test to ensure that we set up distributed communication correctly.
  
      When using Windows, ranks environment variables should not be set, and DeepSpeed should handle this.
  
      """
      fabric = Fabric(strategy=DeepSpeedStrategy(stage=3))
      strategy = fabric._strategy
      assert isinstance(strategy, DeepSpeedStrategy)
      with mock.patch(
          "platform.system", return_value=platform
      ) as platform_mock:
          strategy._init_deepspeed_distributed()
      deepspeed_dist_mock.assert_called()
      platform_mock.assert_called()
      if platform == "Windows":
          # assert no env variables have been set within the DeepSpeedStrategy
          assert all(
              k not in os.environ
              for k in (
                  "MASTER_PORT",
                  "MASTER_ADDR",
                  "RANK",
                  "WORLD_SIZE",
                  "LOCAL_RANK",
              )
          )
      else:
          assert os.environ["MASTER_ADDR"] == str(
              strategy.cluster_environment.main_address
          )
          assert os.environ["MASTER_PORT"] == str(
              strategy.cluster_environment.main_port
          )
          assert os.environ["RANK"] == str(strategy.global_rank)
          assert os.environ["WORLD_SIZE"] == str(strategy.world_size)
          assert os.environ["LOCAL_RANK"] == str(strategy.local_rank)
  
imports: import os
  from copy import deepcopy
  from unittest import mock
  from unittest.mock import ANY
  import pytest
  import torch
  import torch.nn
  import torch.nn.functional
  from lightning.fabric import Fabric
  from lightning.fabric.plugins import DeepSpeedPrecision
  from lightning.fabric.strategies import DeepSpeedStrategy
  from torch.utils.data import DataLoader
  from tests_fabric.helpers.models import RandomDataset, RandomIterableDataset
  from tests_fabric.helpers.runif import RunIf
  from tests_fabric.test_fabric import BoringModel
label_desc: Use image node_id 7 for calling a global function with example usage: test_deepspeed_env_variables_on_platforms(_, deepspeed_dist_mock, platform) without return types