code: def testManyActors(self):
      config = copy.deepcopy(SAMPLE_CLUSTER_CONFIG)
      config_path = self.write_config(config)
      self.provider = MockProvider()
      simulator = Simulator(config_path, self.provider)
  
      start_count = 0
  
      def start_callback():
          nonlocal start_count
          start_count += 1
  
      tasks = [
          Actor(
              duration=float("inf"),
              resources={"CPU": 1},
              start_callback=start_callback,
          )
          for _ in range(5000)
      ]
      simulator.submit(tasks)
  
      time = 0
      while start_count < len(tasks):
          time = simulator.step()
  
      assert time < 650
  
      # Check event logs contain add/remove node events.
      assert any(
          "Adding" in x
          for x in simulator.autoscaler.event_summarizer.summary()
      )
      assert any(
          "Removing" in x
          for x in simulator.autoscaler.event_summarizer.summary()
      )
  
imports: import collections
  import copy
  import logging
  import yaml
  import tempfile
  from typing import Dict, Callable, List
  import shutil
  from queue import PriorityQueue
  import unittest
  import pytest
  import ray
  from ray.tests.test_autoscaler import MockProvider, MockProcessRunner, MockGcsClient, mock_raylet_id, MockAutoscaler
  from ray.tests.test_resource_demand_scheduler import MULTI_WORKER_CLUSTER
  from ray.autoscaler._private.providers import _NODE_PROVIDERS, _clear_provider_cache
  from ray.autoscaler._private.load_metrics import LoadMetrics
  from ray.autoscaler._private.node_launcher import NodeLauncher
  from ray.autoscaler.tags import TAG_RAY_USER_NODE_TYPE, TAG_RAY_NODE_KIND, NODE_KIND_HEAD
  from ray.autoscaler._private.constants import AUTOSCALER_UPDATE_INTERVAL_S
  from ray.autoscaler._private.cli_logger import cli_logger
  from ray.core.generated.common_pb2 import Bundle, PlacementStrategy
  from ray._private.gcs_utils import PlacementGroupTableData
label_desc: Use image node_id 6 for calling the AutoscalingPolicyTest obj's underlying member method code with example usage: obj.testManyActors() without return types