code: def testSentinels(self):
      self.assertEqual(
          sentinel.whatever, sentinel.whatever, "sentinel not stored"
      )
      self.assertNotEqual(
          sentinel.whatever,
          sentinel.whateverelse,
          "sentinel should be unique",
      )
  
file_path: cpython/Lib/test/test_unittest/testmock/testsentinel.py
imports: import unittest
  import copy
  import pickle
  from unittest.mock import sentinel, DEFAULT
label_desc: Use image node_id 1 for calling the SentinelTest obj's underlying member method code with example usage: obj.testSentinels() without return types