code: def test_bool(self):
      self.assertTrue(not self._empty_mapping())
      self.assertTrue(self.reference)
      self.assertTrue(bool(self._empty_mapping()) is False)
      self.assertTrue(bool(self.reference) is True)
  
imports: import copy
  import gc
  import random
  import threading
  import unittest
  import torch
  from torch.testing._internal.common_utils import find_library_location, IS_FBCODE, IS_MACOS, IS_SANDCASTLE, IS_WINDOWS, run_tests, TestCase
  from torch.utils.weak import _WeakHashRef, WeakIdKeyDictionary
label_desc: Use image node_id 8 for calling the WeakKeyDictionaryTestCase obj's underlying member method code with example usage: obj.test_bool() without return types