code: def test_picklevalues(self):
      # Test for specific backwards-compatible pickle values
      import pickle
  
      self.assertEqual(pickle.dumps(True, protocol=0), b"I01\n.")
      self.assertEqual(pickle.dumps(False, protocol=0), b"I00\n.")
      self.assertEqual(pickle.dumps(True, protocol=1), b"I01\n.")
      self.assertEqual(pickle.dumps(False, protocol=1), b"I00\n.")
      self.assertEqual(pickle.dumps(True, protocol=2), b"\x80\x02\x88.")
      self.assertEqual(
          pickle.dumps(False, protocol=2), b"\x80\x02\x89."
      )
  
imports: import unittest
  from test.support import os_helper
  import os
label_desc: Use image node_id 23 for calling the BoolTest obj's underlying member method code with example usage: obj.test_picklevalues() without return types