new_contents: import pathlib
  
  # conda-forge doesn't have exdown
  # exdown = pytest.importorskip("exdown")
  import exdown
  
  this_dir = pathlib.Path(__file__).resolve().parent
  
  test_readme = exdown.pytests(this_dir / ".." / "README.md", syntax_filter="python")
  
subject: add readme test