code: def setUp(self):
      super(RunnerTest, self).setUp()
      self._agent = mock.Mock()
      self._agent.begin_episode.side_effect = lambda x: 0
      self._agent.step.side_effect = self._agent_step
  
      def create_agent_fn(unused_x, unused_y, summary_writer):
          assert isinstance(summary_writer, str)
          self._agent.summary_writer = tf.compat.v1.summary.FileWriter(
              summary_writer
          )
          config = tf.compat.v1.ConfigProto(allow_soft_placement=True)
          config.gpu_options.allow_growth = True
          self._agent._sess = tf.compat.v1.Session("", config=config)
          return self._agent
  
      self._create_agent_fn = create_agent_fn
      self._test_subdir = "/tmp/dopamine_tests"
      shutil.rmtree(self._test_subdir, ignore_errors=True)
      os.makedirs(self._test_subdir)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from absl import flags
  from dopamine.agents.dqn import dqn_agent
  from dopamine.agents.implicit_quantile import implicit_quantile_agent
  from dopamine.agents.rainbow import rainbow_agent
  from dopamine.discrete_domains import checkpointer
  from dopamine.discrete_domains import logger
  from dopamine.discrete_domains import run_experiment
  from dopamine.metrics import collector_dispatcher
  from dopamine.metrics import statistics_instance
  import gin.tf
  import mock
  import tensorflow
label_desc: Use image node_id 2 for calling the RunnerTest obj's underlying member method code with example usage: obj.setUp() and returns: self