code: def test_nonexisting_file(self):
      nonexisting_file = "nonexisting-file"
      with self.assertRaises(dbm.ndbm.error) as cm:
          dbm.ndbm.open(nonexisting_file)
      self.assertIn(nonexisting_file, str(cm.exception))
      self.assertEqual(cm.exception.filename, nonexisting_file)
  
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 11 for calling the DbmTestCase obj's underlying member method code with example usage: obj.test_nonexisting_file() without return types