'return something for SuccessResponse with AX paramaters,
even if it is the empty set.'

def test_fromSuccessResponseWithoutData(self):

    args = {'mode': 'id_res', 'ns': OPENID2_NS, 'ns.ax': ax.AXMessage.ns_uri, 'ax.mode': 'fetch_response'}
    sf = [('openid.' + i) for i in args.keys()]
    msg = Message.fromOpenIDArgs(args)
    class Endpoint:
        claimed_id = 'http://invalid.'
    oreq = SuccessResponse(Endpoint(), msg, signed_fields=sf)
    r = ax.FetchResponse.fromSuccessResponse(oreq)
    self.failUnless((r is not None))
