def test_renderPOST(self):
        class Res(Render):
            def renderHTTP(self, ctx):
                return b''

        s = appserver.NevowSite(Res())
        r = appserver.NevowRequest(
            testutil.FakeChannel(s), True)
        r.method = b'POST'
        r.path = b'/'
        r.content = StringIO(b'foo=bar')
        self.successResultOf(r.process())
        self.assertEquals(r.fields[b'foo'].value, b'bar')
A POST request with form data has the form data parsed into
dataset/ETHPy150Open twisted/nevow/nevow/test/test_appserver.py/TestSiteAndRequest.test_renderPOST