code: def testInitializeWithoutMetadata(self):
      c = client.Client(tpu="tpu_name", project="project", zone="zone")
      self.assertEqual("tpu_name", c._tpu)
      self.assertEqual(True, c._use_api)
      self.assertIsNone(c._service)
      self.assertIsNone(c._credentials)
      self.assertEqual("project", c._project)
      self.assertEqual("zone", c._zone)
      self.assertIsNone(c._discovery_url)
  
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 22 for calling the CloudTpuClientTest obj's underlying member method code with example usage: obj.testInitializeWithoutMetadata() without return types