'Be sure that caller cannot change form method to GET.'

def test_overrideMethod(self):

    m = message.Message.fromPostArgs(self.postargs)
    tag_attrs = dict(self.form_tag_attrs)
    tag_attrs['method'] = 'GET'
    html = m.toFormMarkup(self.action_url, self.form_tag_attrs, self.submit_text)
    self._checkForm(html, m, self.action_url, self.form_tag_attrs, self.submit_text)
