code: def test_does_not_tick_clock_backward(self):
      clock = MockClock(now=99999)
      q = MockRequestQueue(clock, [(123, RequestFinish())])
      q.get()
      assert clock() == 99999
  
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 4 for calling the TestMockRequestQueue obj's underlying member method code with example usage: obj.test_does_not_tick_clock_backward() without return types