code: def test_style_guide_manager():
      """Verify how the StyleGuideManager creates a default style guide."""
      formatter = mock.create_autospec(
          base.BaseFormatter, instance=True
      )
      options = create_options()
      guide = style_guide.StyleGuideManager(
          options, formatter=formatter
      )
      assert guide.default_style_guide.options is options
      assert len(guide.style_guides) == 1
  
file_path: flake8/tests/unit/test_style_guide.py
imports: from __future__ import annotations
  import argparse
  from unittest import mock
  import pytest
  from flake8 import statistics
  from flake8 import style_guide
  from flake8 import utils
  from flake8.formatting import base
label_desc: Use image node_id 3 for calling a global function with example usage: test_style_guide_manager() without return types