code: def optmanager():
      """Generate a simple OptionManager with default test arguments."""
      return manager.OptionManager(
          version=TEST_VERSION,
          plugin_versions="",
          parents=[],
          formatter_names=[],
      )
  
imports: from __future__ import annotations
  import argparse
  import os
  import pytest
  from flake8.main.options import JobsArgument
  from flake8.options import manager
label_desc: Use image node_id 1 for calling a global function with example usage: optmanager() and returns: manager