code: def testGetTpuVersion(self, urlopen):
      c = client.Client(tpu="grpc://1.2.3.4:8470")
      resp = mock.Mock()
      resp.read.side_effect = [
          "{}",
          '{"currentVersion": "someVersion"}',
      ]
      urlopen.return_value = resp
      self.assertIsNone(
          c.runtime_version(), "Missing key should be handled."
      )
      self.assertEqual(
          "someVersion",
          c.runtime_version(),
          "Should return configured version.",
      )
      paths = [call[0][0].full_url for call in urlopen.call_args_list]
      self.assertCountEqual(
          [
              "http://1.2.3.4:8475/requestversion",
              "http://1.2.3.4:8475/requestversion",
          ],
          sorted(paths),
      )
  
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 42 for calling the CloudTpuClientTest obj's underlying member method code with example usage: obj.testGetTpuVersion(urlopen) without return types