code: def test_default_stdin_name_is_not_filtered():
      assert _expand_paths(paths=("-",)) == {"-"}
  
imports: from __future__ import annotations
  import os.path
  import pytest
  from flake8 import utils
  from flake8.discover_files import _filenames_from
  from flake8.discover_files import expand_paths
label_desc: Use image node_id 16 for calling a global function with example usage: test_default_stdin_name_is_not_filtered() without return types