code: def testCheckHealthPeerDown(self):
      def worker_fn():
          enable_collective_ops(
              cluster_resolver_lib.TFConfigClusterResolver()
          )
          context.context().check_collective_ops_peer_health(
              "/job:worker/replica:0/task:1", timeout_in_ms=1000
          )
  
      cluster_spec = multi_worker_test_base.create_cluster_spec(
          num_workers=2
      )
      mpr = multi_process_runner.MultiProcessRunner(
          worker_fn, cluster_spec
      )
      mpr.start_single_process("worker", 0)
      with self.assertRaises(
          (errors.UnavailableError, errors.DeadlineExceededError)
      ):
          mpr.join()
  
imports: import copy
  import os
  import threading
  import time
  from absl.testing import parameterized
  from tensorflow.core.protobuf import tensorflow_server_pb2
  from tensorflow.python.distribute import cluster_resolver
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.eager import context
  from tensorflow.python.eager import test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import collective_ops
label_desc: Use image node_id 2 for calling the CollectiveOpTest obj's underlying member method code with example usage: obj.testCheckHealthPeerDown() without return types