code: def tearDown(self):
      self.reconciler.shutdown()
  
imports: import os
  import sys
  import unittest
  import pytest
  from ray._private.test_utils import load_test_config
  from ray.autoscaler._private.event_summarizer import EventSummarizer
  from ray.autoscaler._private.node_launcher import BaseNodeLauncher
  from ray.autoscaler._private.node_provider_availability_tracker import NodeProviderAvailabilityTracker
  from ray.autoscaler.v2.instance_manager.config import AutoscalingConfig
  from ray.autoscaler.v2.instance_manager.instance_storage import InstanceStorage
  from ray.autoscaler.v2.instance_manager.node_provider import NodeProviderAdapter
  from ray.autoscaler.v2.instance_manager.storage import InMemoryStorage
  from ray.autoscaler.v2.instance_manager.subscribers.reconciler import InstanceReconciler
  from ray.autoscaler.v2.tests.util import FakeCounter
  from ray.core.generated.instance_manager_pb2 import Instance
  from ray.tests.autoscaler_test_utils import MockProvider
label_desc: Use image node_id 2 for calling the InstanceReconcilerTest obj's underlying member method code with example usage: obj.tearDown() without return types