code: def mock_clock(rate_limiter_cls):
      with patch.object(rate_limiter_cls, "_clock") as mock_clock:
          yield mock_clock
  
file_path: geopy/test/extra/rate_limiter.py
imports: import asyncio
  from unittest.mock import MagicMock, patch, sentinel
  import pytest
  from geopy.exc import GeocoderQuotaExceeded, GeocoderServiceError
  from geopy.extra.rate_limiter import AsyncRateLimiter, RateLimiter
label_desc: Use image node_id 5 for calling a global function with example usage: mock_clock(rate_limiter_cls) without return types