code: def test_dict_next(self):
      dict_next = _testcapi.dict_next
      self.assertIsNone(dict_next({}, 0))
      dct = {"a": 1, "b": 2, "c": 3}
      pos = 0
      pairs = []
      while True:
          res = dict_next(dct, pos)
          if res is None:
              break
          rc, pos, key, value = res
          self.assertEqual(rc, 1)
          pairs.append((key, value))
      self.assertEqual(pairs, list(dct.items()))
  
imports: import unittest
  from collections import OrderedDict, UserDict
  from types import MappingProxyType
  from test import support
  import _testcapi
label_desc: Use image node_id 22 for calling the CAPITest obj's underlying member method code with example usage: obj.test_dict_next() without return types