code: def test_ddp_spawn_add_get_queue(tmpdir):
      """Tests get_extra_results/update_main_process_results with DDPSpawnStrategy."""
      ddp_spawn_strategy = TestDDPSpawnStrategy()
      trainer = Trainer(
          default_root_dir=tmpdir,
          fast_dev_run=True,
          accelerator="cpu",
          devices=2,
          strategy=ddp_spawn_strategy,
      )
  
      val: float = 1.0
      val_name: str = "val_acc"
      model = BoringCallbackDDPSpawnModel(val_name, val)
      dm = BoringDataModule()
      trainer.fit(model, datamodule=dm)
      assert trainer.callback_metrics[val_name] == torch.tensor(val)
      assert ddp_spawn_strategy.test_val == "test_val"
  
imports: import os
  from unittest import mock
  from unittest.mock import Mock
  import lightning.pytorch
  import pytest
  import torch
  from lightning.fabric.plugins.environments import ClusterEnvironment, LightningEnvironment
  from lightning.fabric.utilities.distributed import _distributed_is_initialized
  from lightning.fabric.utilities.imports import _TORCH_GREATER_EQUAL_2_0
  from lightning.pytorch import Trainer
  from lightning.pytorch.callbacks import Callback, EarlyStopping
  from lightning.pytorch.demos.boring_classes import BoringDataModule, BoringModel
  from lightning.pytorch.strategies import DDPStrategy
  from lightning.pytorch.strategies.launchers import _SubprocessScriptLauncher
  from lightning.pytorch.strategies.launchers.multiprocessing import _MultiProcessingLauncher
  from lightning.pytorch.trainer import seed_everything
  from torch.distributed.optim import ZeroRedundancyOptimizer
  from torch.multiprocessing import ProcessRaisedException
  from torch.nn.parallel.distributed import DistributedDataParallel
  import tests_pytorch.helpers.pipelines
  from tests_pytorch.helpers.datamodules import ClassifDataModule
  from tests_pytorch.helpers.runif import RunIf
  from tests_pytorch.helpers.simple_models import ClassificationModel
label_desc: Use image node_id 11 for calling a global function with example usage: test_ddp_spawn_add_get_queue(tmpdir) without return types