code: def testCollectorDispatcherSetup(self, mock_collector_dispatcher):
      environment = MockEnvironment()
      mock_collector_dispatcher.return_value = "CD"
      self._agent.set_collector_dispatcher = mock.Mock()
      _ = run_experiment.Runner(
          self._test_subdir, self._create_agent_fn, lambda: environment
      )
      self.assertEqual(1, mock_collector_dispatcher.call_count)
      self.assertEqual(
          1, self._agent.set_collector_dispatcher.call_count
      )
      self.assertEqual(
          "CD",
          self._agent.set_collector_dispatcher.call_args_list[0][0][0],
      )
  
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 15 for calling the RunnerTest obj's underlying member method code with example usage: obj.testCollectorDispatcherSetup(mock_collector_dispatcher) without return types