code: def _get(self, timeout: float = 0) -> Request:
      assert self._remaining_events, "ran out of events in mock queue"
  
      next_event_time, next_event = self._remaining_events[0]
      time_to_next_event = next_event_time - self._clock()
      if 0 < timeout < time_to_next_event:
          self._clock.sleep(timeout)
          raise queue.Empty()
  
      self._remaining_events.pop(0)
      if time_to_next_event > 0:
          self._clock.sleep(time_to_next_event)
      return next_event
  
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 2 for calling the MockRequestQueue obj's underlying member method code with example usage: obj._get(timeout) and returns: next_event