code: def test_dict_like_properties(self):
      x = ModelOutputTest(a=30)
      self.assertEqual(list(x.keys()), ["a"])
      self.assertEqual(list(x.values()), [30])
      self.assertEqual(list(x.items()), [("a", 30)])
      self.assertEqual(list(x), ["a"])
  
      x = ModelOutputTest(a=30, b=10)
      self.assertEqual(list(x.keys()), ["a", "b"])
      self.assertEqual(list(x.values()), [30, 10])
      self.assertEqual(list(x.items()), [("a", 30), ("b", 10)])
      self.assertEqual(list(x), ["a", "b"])
  
      x = ModelOutputTest(a=30, c=10)
      self.assertEqual(list(x.keys()), ["a", "c"])
      self.assertEqual(list(x.values()), [30, 10])
      self.assertEqual(list(x.items()), [("a", 30), ("c", 10)])
      self.assertEqual(list(x), ["a", "c"])
  
      with self.assertRaises(Exception):
          x = x.update({"d": 20})
      with self.assertRaises(Exception):
          del x["a"]
      with self.assertRaises(Exception):
          _ = x.pop("a")
      with self.assertRaises(Exception):
          _ = x.setdefault("d", 32)
  
file_path: H2O/h2o_flexgen/benchmark/third_party/transformers/tests/utils/test_model_output.py
imports: import unittest
  from dataclasses import dataclass
  from typing import Optional
  from transformers.utils import ModelOutput
label_desc: Use image node_id 4 for calling the ModelOutputTester obj's underlying member method code with example usage: obj.test_dict_like_properties() without return types