    # File lib/spec/story/runner.rb, line 40
            def register_listener(listener)
              story_runner.add_listener(listener) # run_started, story_started, story_ended, #run_ended
              world_creator.add_listener(listener) # found_scenario, step_succeeded, step_failed, step_failed
              scenario_runner.add_listener(listener) # scenario_started, scenario_succeeded, scenario_pending, scenario_failed
            end