code: def setup_import_issue_package_tests(self, vfs):
      self.addCleanup(setattr, os, "listdir", os.listdir)
      self.addCleanup(setattr, os.path, "isfile", os.path.isfile)
      self.addCleanup(setattr, os.path, "isdir", os.path.isdir)
      self.addCleanup(sys.path.__setitem__, slice(None), list(sys.path))
  
      def list_dir(path):
          return list(vfs[path])
  
      os.listdir = list_dir
      os.path.isdir = lambda path: not path.endswith(".py")
      os.path.isfile = lambda path: path.endswith(".py")
  
imports: import os.path
  from os.path import abspath
  import re
  import sys
  import types
  import pickle
  from test import support
  from test.support import import_helper
  import unittest
  import unittest.mock
  import test.test_unittest
label_desc: Use image node_id 10 for calling the TestDiscovery obj's underlying member method code with example usage: obj.setup_import_issue_package_tests(vfs) and returns: list