code: def test_suite():
      return unittest.makeSuite(InstallTestCase)
  
imports: import os
  import sys
  import unittest
  import site
  from test.test_support import captured_stdout, run_unittest
  from distutils import sysconfig
  from distutils.command.install import install
  from distutils.command import install
  from distutils.command.build_ext import build_ext
  from distutils.command.install import INSTALL_SCHEMES
  from distutils.core import Distribution
  from distutils.errors import DistutilsOptionError
  from distutils.extension import Extension
  from distutils.tests import support
label_desc: Use image node_id 2 for calling a global function with example usage: test_suite() and returns: unittest