async def METHOD_NAME(self) -> None:
    result: dict[str, Handler] = {}
    def load(filename: str):
        handler = basrh.ServerRequestHandler(filename=filename)
        result['handler'] = handler
    with_file_contents("# This script does nothing", load)
    handler = result['handler']
    payload = handler.process_request(None)
    if handler.failed:
        raise RuntimeError(handler.error)
    assert payload == {}