'Saved regr should include a new_authzr_uri for older Certbots'

def test_save_and_restore_old_version(self):

    self.storage.save(self.acc, self.mock_client)
    path = os.path.join(self.config.accounts_dir, self.acc.id, 'regr.json')
    with open(path, 'r') as f:
        regr = json.load(f)
    self.assertTrue(('new_authzr_uri' in regr))
