code: def tearDown(self):
      if self.xx_created:
          test_support.unload("xx")
          # XXX on Windows the test leaves a directory
          # with xx module in TEMP
      super(BuildExtTestCase, self).tearDown()
  
imports: import sys
  import os
  from StringIO import StringIO
  import textwrap
  from distutils.core import Extension, Distribution
  from distutils.command.build_ext import build_ext
  from distutils import sysconfig
  from distutils.tests import support
  from distutils.errors import DistutilsSetupError, CompileError, DistutilsPlatformError
  import unittest
  from test import test_support
label_desc: Use image node_id 2 for calling the BuildExtTestCase obj's underlying member method code with example usage: obj.tearDown() without return types