code: def test_agent_process_signal_exception(self, invoke_run, _):
      spec = self._get_worker_spec(max_restarts=0)
      agent = TestAgent(spec)
      invoke_run.side_effect = SignalException(
          "signal exception", sigval=signal.SIGTERM
      )
      with patch.object(agent, "_shutdown") as shutdown_mock:
          with self.assertRaises(SignalException):
              agent.run()
          args, _ = shutdown_mock.call_args
          self.assertEqual(signal.SIGTERM, args[0])
  
imports: import signal
  import unittest
  import uuid
  from typing import Any, Dict
  from unittest.mock import call, patch, MagicMock
  import torch.distributed.elastic.rendezvous.registry
  from torch.distributed.elastic.agent.server.api import RunResult, SimpleElasticAgent, WorkerGroup, WorkerSpec, WorkerState, _get_fq_hostname, _RoleInstanceInfo
  from torch.distributed.elastic.multiprocessing import SignalException
  from torch.distributed.elastic.multiprocessing.errors import ProcessFailure
  from torch.distributed.elastic.rendezvous import RendezvousHandler, RendezvousParameters
  from torch.distributed.elastic.utils.distributed import get_free_port
  from torch.testing._internal.common_utils import run_tests
label_desc: Use image node_id 28 for calling the SimpleElasticAgentTest obj's underlying member method code with example usage: obj.test_agent_process_signal_exception(invoke_run, _) without return types