code: def test_proxy_state_update_healthy_check_health_sometimes_fails():
      """Test that the proxy is UNHEALTHY after consecutive health-check failures.
  
      The proxy state starts with STARTING. Then the proxy fails a few times
      (less than the threshold needed to set it UNHEALTHY). Then it succeeds, so
      it becomes HEALTHY. Then it fails a few times again but stays HEALTHY
      because the failures weren't consecutive with the previous ones. And then
      it finally fails enough times to become UNHEALTHY.
      """
  
      proxy_state = _create_proxy_state()
  
      # Wait for the proxy to become ready.
      wait_for_condition(
          condition_predictor=_update_and_check_proxy_status,
          state=proxy_state,
          status=ProxyStatus.HEALTHY,
      )
  
      def _update_until_num_health_checks_received(
          state: ProxyState, num_health_checks: int
      ):
          state.update()
          assert (
              state._actor_proxy_wrapper.get_num_health_checks()
          ) == num_health_checks
          return True
  
      def incur_health_checks(
          pass_checks: bool,
          num_checks: int,
          expected_final_status: ProxyStatus,
      ):
          """Waits for num_checks health checks to occur.
  
          Args:
              pass_checks: whether the health checks should pass.
              num_checks: number of checks to wait for.
              expected_final_status: the final status that should be asserted.
          """
          if pass_checks:
              proxy_state._actor_proxy_wrapper.health = (
                  ProxyWrapperCallStatus.FINISHED_SUCCEED
              )
          else:
              proxy_state._actor_proxy_wrapper.health = (
                  ProxyWrapperCallStatus.FINISHED_FAILED
              )
  
          cur_num_health_checks = (
              proxy_state._actor_proxy_wrapper.get_num_health_checks()
          )
  
          wait_for_condition(
              condition_predictor=_update_until_num_health_checks_received,
              state=proxy_state,
              num_health_checks=cur_num_health_checks + num_checks,
          )
          assert (
              proxy_state._actor_proxy_wrapper.get_num_health_checks()
              <= cur_num_health_checks + num_checks
          )
  
          if expected_final_status:
              assert proxy_state.status == expected_final_status
  
      # Make sure that the proxy_state's status remains HEALTHY as long as
      # PROXY_HEALTH_CHECK_UNHEALTHY_THRESHOLD failures don't occur consecutively.
      for _ in range(3):
          incur_health_checks(
              pass_checks=True,
              num_checks=1,
              expected_final_status=ProxyStatus.HEALTHY,
          )
          incur_health_checks(
              pass_checks=False,
              num_checks=PROXY_HEALTH_CHECK_UNHEALTHY_THRESHOLD - 1,
              expected_final_status=ProxyStatus.HEALTHY,
          )
  
      # Have health check succeed one more time.
      incur_health_checks(
          pass_checks=True,
          num_checks=1,
          expected_final_status=ProxyStatus.HEALTHY,
      )
  
      # Check failing the health check PROXY_HEALTH_CHECK_UNHEALTHY_THRESHOLD
      # times makes the proxy UNHEALTHY again.
      incur_health_checks(
          pass_checks=False,
          num_checks=PROXY_HEALTH_CHECK_UNHEALTHY_THRESHOLD,
          expected_final_status=ProxyStatus.UNHEALTHY,
      )
  
imports: import json
  import time
  from typing import List, Tuple
  from unittest.mock import patch
  import pytest
  from ray._private.test_utils import wait_for_condition
  from ray.serve._private.cluster_node_info_cache import ClusterNodeInfoCache
  from ray.serve._private.common import ProxyStatus
  from ray.serve._private.constants import PROXY_HEALTH_CHECK_UNHEALTHY_THRESHOLD
  from ray.serve._private.proxy_state import ProxyState, ProxyStateManager, ProxyWrapper, ProxyWrapperCallStatus
  from ray.serve._private.test_utils import MockTimer
  from ray.serve._private.utils import Timer
  from ray.serve.config import DeploymentMode, HTTPOptions
  from ray.serve.schema import LoggingConfig
label_desc: Use image node_id 17 for calling a global function with example usage: test_proxy_state_update_healthy_check_health_sometimes_fails() and returns: True