code: def test_sha512_rfc4231(self):
      self._rfc4231_test_cases(hashlib.sha512, "sha512", 64, 128)
  
imports: import binascii
  import functools
  import hmac
  import hashlib
  import unittest
  import unittest.mock
  import warnings
  from test.support import hashlib_helper, check_disallow_instantiation
  from _operator import _compare_digest
label_desc: Use image node_id 9 for calling the TestVectorsTestCase obj's underlying member method code with example usage: obj.test_sha512_rfc4231() without return types