code: def restart_free_slots(self):
      self._restart_record = True
  
file_path: mars/mars/services/scheduling/worker/tests/test_quota.py
imports: import asyncio
  import os
  import sys
  import time
  import pytest
  from .....None import oscar
  from .....tests.core import mock
  from .....utils import get_next_port
  from ...worker import QuotaActor, MemQuotaActor, BandSlotManagerActor
label_desc: Use image node_id 2 for calling the MockBandSlotManagerActor obj's underlying member method code with example usage: obj.restart_free_slots() without return types