code: def test_timer_tpu_warning(self):
      with warnings.catch_warnings(record=True) as w:
          warnings.simplefilter("always")
  
          def _mock_tpu_client(library_path=None):
              time_to_wait = 5
              start = time.time()
              while not w:
                  if time.time() - start > time_to_wait:
                      raise ValueError(
                          "This test should not hang for more than "
                          f"{time_to_wait} seconds."
                      )
                  time.sleep(0.1)
  
              self.assertLen(w, 1)
              msg = str(w[-1].message)
              self.assertIn(
                  "Did you run your code on all TPU hosts?", msg
              )
  
          with mock.patch.object(
              xc, "make_tpu_client", side_effect=_mock_tpu_client
          ):
              xb.tpu_client_timer_callback(0.01)
  
imports: import os
  import platform
  import time
  import warnings
  from absl import logging
  from absl.testing import absltest
  from jax._src import compiler
  from jax._src import config
  from jax._src import test_util
  from jax._src import xla_bridge
  from jax._src.interpreters import xla
  from jax._src.lib import xla_client
label_desc: Use image node_id 9 for calling the XlaBridgeTest obj's underlying member method code with example usage: obj.test_timer_tpu_warning() without return types