def simpleModuleEntry(self):
        """
        Add a sample module and package to the path, returning a L{FilePath}
        pointing at the module which will be loadable as C{package.module}.
        """
        paths = self.pathEntryTree(
            {b"package": {b"__init__.py": self._packageInit.encode("utf-8"),
                         b"module.py": b""}})
        return paths[b'package'][b'module.py']

        Add a sample module and package to the path, returning a L{FilePath}
        pointing at the module which will be loadable as C{package.module}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_deprecate.py