code: def _mock_time(self, *args, **kwargs):
      return self._time_now
  
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 2 for calling the CloudTpuClientTest obj's underlying member method code with example usage: obj._mock_time() and returns: self