code: def _mock_sleep(self, secs):
      self._time_now += secs
  
imports: import datetime
  import json
  import os
  import time
  import urllib
  from absl import flags
  from tensorflow.python.platform import test
  from tensorflow.python.tpu.client import client
label_desc: Use image node_id 3 for calling the CloudTpuClientTest obj's underlying member method code with example usage: obj._mock_sleep(secs) without return types