def test_defaultHomeDirectory(self):
        """
        If no extra directory is passed to L{ftp.FTPRealm}, it uses C{"/home"}
        as the base directory containing all user home directories.
        """
        realm = ftp.FTPRealm(self.mktemp())
        home = realm.getHomeDirectory('alice@example.com')
        self.assertEqual(filepath.FilePath('/home/alice@example.com'), home)

        If no extra directory is passed to L{ftp.FTPRealm}, it uses C{"/home"}
        as the base directory containing all user home directories.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_ftp.py