code: def setUp(self):
      dirname = os_helper.TESTFN
      os.mkdir(dirname)
      self.addCleanup(os_helper.rmtree, dirname)
      self.base_path = os.path.join(dirname, "shelftemp.db")
      self.addCleanup(setattr, dbm, "_defaultmod", dbm._defaultmod)
      dbm._defaultmod = self.dbm_mod
  
imports: import unittest
  import dbm
  import shelve
  import pickle
  import os
  from test.support import os_helper
  from collections.abc import MutableMapping
  from test.test_dbm import dbm_iterator
  from test import mapping_tests
label_desc: Use image node_id 2 for calling the TestShelveFileBase obj's underlying member method code with example usage: obj.setUp() without return types