code: def test_timesteps(self):
      agent = mock.Mock()
      env = mock.Mock()
      # First episode: 0 -> 1 -> 2 -> 3 (reset)
      # Second episode: 4 -> 5 -> 6 -> 7 (done)
      env.reset.side_effect = [("state", 0), ("state", 4)]
      env.step.side_effect = [
          (("state", 1), 0.1, False, {}),
          (("state", 2), 0.2, False, {}),
          (("state", 3), 0.3, False, {"needs_reset": True}),
          (("state", 5), -0.5, False, {}),
          (("state", 6), 0, False, {}),
          (("state", 7), 1, True, {}),
      ]
  
      if self.n_episodes:
          with self.assertRaises(AssertionError):
              scores = evaluator.run_evaluation_episodes(
                  env,
                  agent,
                  n_steps=self.n_timesteps,
                  n_episodes=self.n_episodes,
              )
      else:
          scores = evaluator.run_evaluation_episodes(
              env,
              agent,
              n_steps=self.n_timesteps,
              n_episodes=self.n_episodes,
          )
          if self.n_timesteps == 2:
              self.assertAlmostEqual(len(scores), 1)
              self.assertAlmostEqual(scores[0], 0.3)
              self.assertEqual(agent.stop_episode.call_count, 1)
          elif self.n_timesteps == 5:
              self.assertAlmostEqual(len(scores), 1)
              self.assertAlmostEqual(scores[0], 0.6)
              self.assertEqual(agent.stop_episode.call_count, 2)
          else:
              self.assertAlmostEqual(len(scores), 2)
              self.assertAlmostEqual(scores[0], 0.6)
              self.assertAlmostEqual(scores[1], 0.5)
              self.assertEqual(agent.stop_episode.call_count, 2)
  
imports: import tempfile
  import unittest
  from unittest import mock
  from chainer import testing
  import chainerrl
  from chainerrl.experiments import evaluator
label_desc: Use image node_id 1 for calling the TestRunTimeBasedEvaluationEpisode obj's underlying member method code with example usage: obj.test_timesteps() without return types