code: def test(self):
      err = doctest.testmod(doc)[0]
      self.assertEqual(err, 0)
  
imports: from __future__ import absolute_import
  import sys
  import doctest
  import unittest
  import decimal
  import inspect
  import functools
  import collections
  from collections import defaultdict
  from decorator import dispatch_on, contextmanager, decorator
label_desc: Use image node_id 1 for calling the DocumentationTestCase obj's underlying member method code with example usage: obj.test() without return types