code: def test_terminate_safeguards():
      """Tests the following behaviors:
      - the node provider ignores requests to terminate a node twice.
      - the node provider ignores requests to terminate an unknown node.
      """
      node_provider = MockBatchingNodeProvider(
          provider_config={
              DISABLE_LAUNCH_CONFIG_CHECK_KEY: True,
              DISABLE_NODE_UPDATERS_KEY: True,
              FOREGROUND_NODE_LAUNCH_KEY: True,
          },
          cluster_name="test-cluster",
          _allow_multiple=True,
      )
      nodes = node_provider.non_terminated_nodes({})
      assert len(nodes) == 1
      head_node = nodes[0]
      node_provider.create_node(
          node_config={}, tags={TAG_RAY_USER_NODE_TYPE: "type"}, count=1
      )
      node_provider.post_process()
      nodes = node_provider.non_terminated_nodes({})
      assert len(nodes) == 2
  
      worker_node = ""
      for node in nodes:
          if node == head_node:
              continue
          else:
              worker_node = node
  
      # This node is not in our list.
      unknown_node = node + worker_node
      node_provider.terminate_node(unknown_node)
      node_provider.post_process()
      nodes = node_provider.non_terminated_nodes({})
      # Terminate request was ignored because the node is unknown.
      assert len(nodes) == 2
  
      node_provider.terminate_node(worker_node)
      node_provider.terminate_node(worker_node)
      node_provider.post_process()
      nodes = node_provider.non_terminated_nodes({})
      # Second terminate request was ignored.
      assert len(nodes) == 1
  
imports: from copy import copy
  from uuid import uuid4
  import os
  import random
  import sys
  from typing import Any, Dict
  from collections import defaultdict
  import pytest
  from ray.autoscaler.batching_node_provider import BatchingNodeProvider, NodeData, ScaleRequest
  from ray.autoscaler._private.util import NodeID, NodeType
  from ray.autoscaler.tags import STATUS_UP_TO_DATE, TAG_RAY_USER_NODE_TYPE, TAG_RAY_NODE_KIND, TAG_RAY_NODE_STATUS, NODE_KIND_HEAD, NODE_KIND_WORKER
  from ray.autoscaler._private.constants import DISABLE_LAUNCH_CONFIG_CHECK_KEY, DISABLE_NODE_UPDATERS_KEY, FOREGROUND_NODE_LAUNCH_KEY
label_desc: Use image node_id 3 for calling a global function with example usage: test_terminate_safeguards() without return types