code: def test_finish_waits_for_pending_requests(
      self, prepare: "PrepareFixture"
  ):
      caf_result = mock_create_artifact_files_result(["a", "b"])
      api = Mock(create_artifact_files=Mock(return_value=caf_result))
  
      step_prepare = StepPrepare(
          api=api, batch_time=1, inter_event_time=1, max_batch_size=10
      )
      step_prepare.start()
  
      res_future = prepare(step_prepare, simple_file_spec(name="a"))
  
      with pytest.raises(concurrent.futures.TimeoutError):
          res_future.result(timeout=0.2)
  
      assert step_prepare.is_alive()
  
      step_prepare.finish()
  
      res = res_future.result(timeout=5)
  
      assert res.upload_url == caf_result["a"]["uploadUrl"]
  
      step_prepare._thread.join()
      assert not step_prepare.is_alive()
  
imports: import asyncio
  import concurrent.futures
  import dataclasses
  import queue
  import threading
  from typing import TYPE_CHECKING, Iterable, Mapping, Tuple
  from unittest.mock import Mock, call
  import pytest
  from wandb.filesync.step_prepare import Request, RequestFinish, RequestPrepare, ResponsePrepare, StepPrepare, gather_batch
label_desc: Use image node_id 6 for calling the TestStepPrepare obj's underlying member method code with example usage: obj.test_finish_waits_for_pending_requests(prepare) without return types