Method _check_pickling_with_opcode

Lib/test/pickletester.py:3827–3831

(self, obj, opcode, proto)

                        self.assertFalse(opcode_in_pickle(pickle.LONG, p))

    def _check_pickling_with_opcode(self, obj, opcode, proto):
        pickled = self.dumps(obj, proto)
        self.assertTrue(opcode_in_pickle(opcode, pickled))
        unpickled = self.loads(pickled)
        self.assertEqual(obj, unpickled)

    def test_appends_on_non_lists(self):
        # Issue #17720