code: def test_parse_dtensor_env_var_from_cluster_resolver(self):
      cluster_resolver = (
          tfconfig_cluster_resolver.TFConfigClusterResolver()
      )
  
      dtensor_env_vars = (
          mwms._parse_dtensor_env_var_from_cluster_resolver(
              cluster_resolver
          )
      )
  
      tf_config = json.loads(os.environ["TF_CONFIG"])
      worker_jobs = ",".join(tf_config["cluster"]["worker"])
      client_id = tf_config["task"]["index"]
  
      self.assertLen(dtensor_env_vars, 4)
      self.assertEqual(dtensor_env_vars["DTENSOR_JOBS"], worker_jobs)
      self.assertEqual(
          dtensor_env_vars["DTENSOR_NUM_CLIENTS"], str(self.num_client)
      )
      self.assertEqual(dtensor_env_vars["DTENSOR_CLIENT_ID"], client_id)
      self.assertEqual(dtensor_env_vars["DTENSOR_JOB_NAME"], "worker")
  
imports: import json
  import os
  from absl import flags
  from absl.testing import parameterized
  import numpy
  from tensorflow.dtensor.python import api
  from tensorflow.dtensor.python import d_variable
  from tensorflow.dtensor.python import layout
  from tensorflow.dtensor.python.tests import multi_client_test_util
  from tensorflow.dtensor.python.tests import test_backend_util
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.distribute import distribute_lib
  from tensorflow.python.distribute import reduce_util
  from tensorflow.python.distribute.cluster_resolver import tfconfig_cluster_resolver
  from tensorflow.python.distribute.experimental import dtensor_util
  from tensorflow.python.distribute.experimental import multi_worker_mirrored_strategy
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_spec
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import stateless_random_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the MultiWorkerMirroredStrategyTest obj's underlying member method code with example usage: obj.test_parse_dtensor_env_var_from_cluster_resolver() without return types