def test_voice(self):
        self.protocol.voice(self.occupantJID)

        m = self.stub.output[-1]

        query = ("/message/x[@type='submit']/field/value"
                    "[text()='%s']") % muc.NS_MUC_REQUEST
        self.assertTrue(xpath.matches(query, m), 'Invalid voice message stanza')
Returns a 4-tuple extent for the `Extent` aggregate by converting
dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_muc.py/MUCClientProtocolTest.test_voice--crossover with--dataset/ETHPy150Open django/django/django/contrib/gis/db/backends/postgis/operations.py/PostGISOperations.convert_extent