code: def test_debug_mode(self):
      with open(TESTFN, "w") as f:
          f.write("[global]\n")
          f.write("command_packages = foo.bar, splat")
      self.addCleanup(unlink, TESTFN)
  
      files = [TESTFN]
      sys.argv.append("build")
  
      with captured_stdout() as stdout:
          self.create_distribution(files)
      stdout.seek(0)
      self.assertEqual(stdout.read(), "")
      distutils.dist.DEBUG = True
      try:
          with captured_stdout() as stdout:
              self.create_distribution(files)
          stdout.seek(0)
          self.assertEqual(stdout.read(), "")
      finally:
          distutils.dist.DEBUG = False
  
imports: import os
  import StringIO
  import sys
  import unittest
  import warnings
  import textwrap
  from distutils.dist import Distribution, fix_help_options
  from distutils.cmd import Command
  import distutils.dist
  from test.test_support import TESTFN, captured_stdout, run_unittest, unlink
  from distutils.tests import support
  from distutils import log
label_desc: Use image node_id 4 for calling the DistributionTestCase obj's underlying member method code with example usage: obj.test_debug_mode() without return types