def test_overrideRequired(self):
        m = message.Message.fromPostArgs(self.postargs)

        tag_attrs = dict(self.form_tag_attrs)
        tag_attrs['accept-charset'] = 'UCS4'
        tag_attrs['enctype'] = 'invalid/x-broken'

        html = m.toFormMarkup(self.action_url, tag_attrs,
                              self.submit_text)
        self._checkForm(html, m, self.action_url,
                        tag_attrs, self.submit_text)
Be sure that caller CANNOT change the form charset for
dataset/ETHPy150Open adieu/python-openid/openid/test/test_message.py/MessageTest.test_overrideRequired