code: def clear_active(self) -> None:
      self._exp_calls.append("clear_active")
      self._retvals.append(None)
  
imports: import contextlib
  import os
  from typing import Any, Iterator, List, Optional, cast
  import responses
  from responses import registries
  import determined
  from determined.common.api import authentication
label_desc: Use image node_id 12 for calling the MockTokenStore obj's underlying member method code with example usage: obj.clear_active() without return types