'Test setting Iq stanza payload.'

def testPayload(self):

    iq = self.Iq()
    iq.setPayload(ET.Element('{test}tester'))
    self.check(iq, '\n                                        <iq    id="0">\n                                                <tester    xmlns="test"    />\n                                        </iq>\n                                ', use_values=False)
