code: def test_detect():
      """Test the detection of a LSF environment configuration."""
      with mock.patch.dict(os.environ, {}, clear=True):
          assert not LSFEnvironment.detect()
  
      with mock.patch.dict(
          os.environ,
          {
              "LSB_DJOB_RANKFILE": "",
              "LSB_JOBID": "",
              "JSM_NAMESPACE_SIZE": "",
              "JSM_NAMESPACE_LOCAL_RANK": "",
          },
      ):
          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 8 for calling a global function with example usage: test_detect() without return types