code: def setUp(self):
      self.filename = os_helper.TESTFN
      self.d = dbm.ndbm.open(self.filename, "c")
      self.d.close()
  
imports: from test.support import import_helper
  from test.support import os_helper
  import os
  import unittest
  import dbm.ndbm
  from dbm.ndbm import error
label_desc: Use image node_id 1 for calling the DbmTestCase obj's underlying member method code with example usage: obj.setUp() without return types