code: def test_max_len():
      assert (
          _max_len("some_long_string/even_longer", max_len=28)
          == "some_long_string/even_longer"
      )
      assert (
          _max_len("some_long_string/even_longer", max_len=15)
          == ".../even_longer"
      )
  
      assert (
          _max_len(
              "19_character_string/19_character_string/too_long",
              max_len=20,
              wrap=True,
          )
          == "...r_string/19_chara\ncter_string/too_long"
      )
  
imports: import collections
  import os
  import regex
  import unittest
  from unittest.mock import MagicMock, Mock, patch
  import pytest
  import numpy
  from ray import train, tune
  from ray._private.test_utils import run_string_as_driver
  from ray.tune.progress_reporter import CLIReporter, JupyterNotebookReporter, ProgressReporter, _fair_filter_trials, _best_trial_str, _detect_reporter, _time_passed_str, _trial_progress_str, TuneReporterBase, _max_len
  from ray.tune.result import AUTO_RESULT_KEYS
  from ray.tune.experiment.trial import Trial
label_desc: Use image node_id 1 for calling a global function with example usage: test_max_len() without return types