code: def testWaitForHealthyRaisesError(self):
      time_mock = mock.patch.object(time, "time", autospec=True).start()
      time_mock.side_effect = self._mock_time
      sleep_mock = mock.patch.object(
          time, "sleep", autospec=True
      ).start()
      sleep_mock.side_effect = self._mock_sleep
  
      # Mock timeseries where takes longer than timeout.
      health_timeseries = ["UNHEALTHY_MAINTENANCE"] * 50 + [
          "TIMEOUT"
      ] * 50
      tpu_map = {
          "projects/test-project/locations/us-central1-c/nodes/tpu_name": {
              "ipAddress": "10.1.2.3",
              "port": "8470",
              "state": "READY",
              "health": health_timeseries,
          },
      }
  
      c = client.Client(
          tpu="tpu_name",
          service=self.mock_service_client(tpu_map=tpu_map),
      )
  
      # Doesn't throw RuntimeError as TPU becomes HEALTHY before timeout
      with self.assertRaisesRegex(
          RuntimeError, "Timed out waiting for TPU .* to become healthy"
      ):
          c.wait_for_healthy(timeout_s=80, interval=5)
  
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 38 for calling the CloudTpuClientTest obj's underlying member method code with example usage: obj.testWaitForHealthyRaisesError() without return types