code: def test_default(self) -> None:
      import random
  
      try:
          random.SystemRandom()
          expected = True
      except NotImplementedError:
          expected = False
      _random, using_sysrandom = _get_sysrandom()
      assert using_sysrandom == expected
  
imports: from __future__ import annotations
  import pytest
  import calendar
  import codecs
  import datetime
  import json
  import random
  from unittest.mock import MagicMock, Mock, patch
  from bokeh.util.token import _TOKEN_ZLIB_KEY, _base64_decode, _base64_encode, _get_sysrandom, _reseed_if_needed, _signature, check_token_signature, generate_jwt_token, generate_secret_key, generate_session_id, get_session_id, get_token_payload
  from tests.support.util.env import envset
  import bokeh.util.token
label_desc: Use image node_id 1 for calling the Test__get_sysrandom obj's underlying member method code with example usage: obj.test_default() without return types