code: def test_positive_integer_or_none_4():
      """Assert that the TPOT CLI interface's positive_integer_or_none parsing return None when value is string 'None' or 'none'."""
      assert positive_integer_or_none("none") is None
      assert positive_integer_or_none("None") is None
  
imports: import subprocess
  import sys
  from os import remove, path
  from contextlib import contextmanager
  from distutils.version import LooseVersion
  import nose
  import numpy
  import pandas
  import sklearn
  from tpot.driver import positive_integer, float_range, _get_arg_parser, _print_args, _read_data_file, load_scoring_function, tpot_driver, positive_integer_or_none
  from nose.tools import assert_raises, assert_equal, assert_in
  from unittest import TestCase
label_desc: Use image node_id 16 for calling a global function with example usage: test_positive_integer_or_none_4() without return types