code: def test_failure_wait(self):
      def waiter():
          self.assertTrue(self._manager.wait_for_stop())
  
      def failure():
          raise Exception("Error")
  
      self._manager.thread_worker("waiter", waiter)
      self._manager.thread_worker("failure", failure)
      with self.assertRaisesRegexp(Exception, "Error"):
          self._manager.wait(["waiter"])
      self._manager.wait()
  
imports: import os
  import signal
  import threading
  import time
  from absl.testing import absltest
  from launchpad.launch import worker_manager
  import mock
label_desc: Use image node_id 9 for calling the WorkerManagerTest obj's underlying member method code with example usage: obj.test_failure_wait() without return types