code: def test_openmpi_runner(runner_info):
      env, resource_pool, world_info, args = runner_info
      runner = mnrunner.OpenMPIRunner(args, world_info, resource_pool)
      cmd = runner.get_cmd(env, resource_pool)
      assert cmd[0] == "mpirun"
  
file_path: deepspeed/tests/unit/launcher/test_multinode_runner.py
imports: from copy import deepcopy
  from deepspeed.launcher import multinode_runner
  from deepspeed.launcher.runner import encode_world_info, parse_args
  import os
  import pytest
label_desc: Use image node_id 3 for calling a global function with example usage: test_openmpi_runner(runner_info) without return types