code: def test_master_host() -> None:
      # Creates an experiment normally, should error if the back communication channel is broken
      exp.run_failure_test(
          conf.fixtures_path("no_op/single-one-short-step.yaml"),
          conf.fixtures_path("no_op"),
          "Unable to reach the master at DET_MASTER=http://junkmaster:8080.  "
          + "This may be due to an address "
          + "resolution problem, a certificate problem, a firewall problem, "
          + "a proxy problem, or some other networking error.",
      )
  
imports: import logging
  import sys
  from typing import List
  import pytest
  import torch
  from determined.common.api import bindings
  from tests import api_utils, command
  from tests import config
  from tests import experiment
label_desc: Use image node_id 9 for calling a global function with example usage: test_master_host() without return types