code: def test_directory_missing_main(self) -> None:
      doc = Document()
  
      def load(filename: str):
          handler = bahd.DirectoryHandler(filename=filename)
          handler.modify_document(doc)
          if handler.failed:
              raise RuntimeError(handler.error)
  
      with pytest.raises(ValueError):
          with_directory_contents({}, load)
  
imports: from __future__ import annotations
  import pytest
  from typing import TYPE_CHECKING
  import jinja2
  from bokeh.core.templates import FILE
  from bokeh.document import Document
  from tests.support.util.filesystem import with_directory_contents
  import bokeh.application.handlers.directory
label_desc: Use image node_id 7 for calling the Test_DirectoryHandler obj's underlying member method code with example usage: obj.test_directory_missing_main() without return types