code: def test_command_packages_unspecified(self):
      sys.argv.append("build")
      d = self.create_distribution()
      self.assertEqual(d.get_command_packages(), ["distutils.command"])
  
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 5 for calling the DistributionTestCase obj's underlying member method code with example usage: obj.test_command_packages_unspecified() without return types