code: def test_suite():
      return unittest.makeSuite(DirUtilTestCase)
  
imports: import unittest
  import os
  import stat
  import shutil
  import sys
  from distutils.dir_util import mkpath, remove_tree, create_tree, copy_tree, ensure_relative
  from distutils import log
  from distutils.tests import support
  from test.test_support import run_unittest
label_desc: Use image node_id 1 for calling a global function with example usage: test_suite() and returns: unittest