code: def testSimpleMasterRetrieval(self):
      slurm_cluster_resolver = SlurmClusterResolver(
          jobs={"ps": 1, "worker": 2},
          port_base=8888,
          tasks_per_node=1,
          gpus_per_node=1,
          gpus_per_task=1,
          auto_set_gpu=False,
      )
  
      slurm_cluster_resolver.task_type = "worker"
      slurm_cluster_resolver.task_id = 1
      self.assertEqual(
          slurm_cluster_resolver.master(), "grpc://t02n43:8888"
      )
  
      slurm_cluster_resolver.rpc_layer = "ab"
      self.assertEqual(
          slurm_cluster_resolver.master("ps", 0), "ab://t02n13:8888"
      )
      self.assertEqual(
          slurm_cluster_resolver.master("ps", 0, rpc_layer="test"),
          "test://t02n13:8888",
      )
  
file_path: tensorflow/tensorflow/python/distribute/cluster_resolver/slurm_cluster_resolver_test.py
imports: import os
  from tensorflow.python.distribute.cluster_resolver.slurm_cluster_resolver import expand_hostlist
  from tensorflow.python.distribute.cluster_resolver.slurm_cluster_resolver import expand_tasks_per_node
  from tensorflow.python.distribute.cluster_resolver.slurm_cluster_resolver import SlurmClusterResolver
  from tensorflow.python.platform import test
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 6 for calling the SlurmClusterResolverTest obj's underlying member method code with example usage: obj.testSimpleMasterRetrieval() without return types