code: def test_attributes_from_environment_variables(tmp_path):
      """Test that the LSF environment takes the attributes from the environment variables."""
      environ = {
          "LSB_DJOB_RANKFILE": _make_rankfile(tmp_path),
          "LSB_JOBID": "1234",
          "JSM_NAMESPACE_SIZE": "4",
          "JSM_NAMESPACE_RANK": "3",
          "JSM_NAMESPACE_LOCAL_RANK": "1",
      }
      with mock.patch.dict(os.environ, environ), mock.patch(
          "socket.gethostname", return_value="10.10.10.2"
      ):
          env = LSFEnvironment()
          assert env.creates_processes_externally
          assert env.main_address == "10.10.10.0"
          assert env.main_port == 10234
          assert env.world_size() == 4
          assert env.global_rank() == 3
          assert env.local_rank() == 1
          env.set_global_rank(100)
          assert env.global_rank() == 3
          env.set_world_size(100)
          assert env.world_size() == 4
          assert LSFEnvironment.detect()
  
file_path: pytorch-lightning/tests/tests_fabric/plugins/environments/test_lsf.py
imports: import os
  from unittest import mock
  import pytest
  from lightning.fabric.plugins.environments import LSFEnvironment
label_desc: Use image node_id 6 for calling a global function with example usage: test_attributes_from_environment_variables(tmp_path) without return types