code: def test_suite():
      return unittest.makeSuite(CoreTestCase)
  
imports: import StringIO
  import distutils.core
  import os
  import shutil
  import sys
  import test.test_support
  from test.test_support import captured_stdout, run_unittest
  import unittest
  from distutils.tests import support
  from distutils import log
label_desc: Use image node_id 1 for calling a global function with example usage: test_suite() and returns: unittest