code: def test_TTL(self) -> None:
      # Verify that TLL is checked on execution of the `status` property.
      self.batch.ttl_seconds = 1
      self.batch.mark_running(no_runner_required=True)
      self.assertTrue(self.batch.status.is_running)
      sleep(1)  # Wait 1 second for trial TTL to elapse.
      self.assertTrue(self.batch.status.is_failed)
      self.assertIn(
          0, self.experiment.trial_indices_by_status[TrialStatus.FAILED]
      )
  
      # Verify that TTL is checked on `experiment.trial_indices_by_status`.
      batch_trial = self.experiment.new_batch_trial(ttl_seconds=1)
      batch_trial.mark_running(no_runner_required=True)
      self.assertTrue(batch_trial.status.is_running)
      sleep(1)  # Wait 1 second for trial TTL to elapse.
      self.assertIn(
          1, self.experiment.trial_indices_by_status[TrialStatus.FAILED]
      )
      self.assertTrue(self.experiment.trials[1].status.is_failed)
  
      # Verify that TTL is checked on `experiment.trials`.
      batch_trial = self.experiment.new_batch_trial(ttl_seconds=1)
      batch_trial.mark_running(no_runner_required=True)
      self.assertTrue(batch_trial.status.is_running)
      self.assertIn(
          2,
          self.experiment.trial_indices_by_status[TrialStatus.RUNNING],
      )
      sleep(1)  # Wait 1 second for trial TTL to elapse.
      self.experiment.trials
      # Check `_status`, not `status`, to ensure it's within `trials` that the status
      # was actually changed, not in `status`.
      self.assertEqual(batch_trial._status, TrialStatus.FAILED)
      self.assertIn(
          2, self.experiment.trial_indices_by_status[TrialStatus.FAILED]
      )
  
imports: import math
  from time import sleep
  from unittest import mock
  from unittest.mock import patch, PropertyMock
  import numpy
  from ax.core.arm import Arm
  from ax.core.base_trial import TrialStatus
  from ax.core.batch_trial import BatchTrial, GeneratorRunStruct
  from ax.core.experiment import Experiment
  from ax.core.generator_run import GeneratorRun, GeneratorRunType
  from ax.core.parameter import FixedParameter, ParameterType
  from ax.core.search_space import SearchSpace
  from ax.runners.synthetic import SyntheticRunner
  from ax.utils.common.testutils import TestCase
  from ax.utils.common.typeutils import checked_cast
  from ax.utils.testing.core_stubs import get_abandoned_arm, get_arm, get_arm_weights1, get_arms, get_experiment, get_generator_run, get_generator_run2, get_weights
label_desc: Use image node_id 25 for calling the BatchTrialTest obj's underlying member method code with example usage: obj.test_TTL() without return types