Unittest demonstrating attribute stripping.

ConferenceVerbTwimlUnitTest.py

import xml.etree.ElementTree as ET
from twilio import twiml
from django.test import TestCase

class TwimlTest(TestCase):

    def test_twiml_conference_verb(self):
        """
        Sanity check for TwiML generation.
        """
        r = twiml.Response()
        import ipdb; ipdb.set_trace()
        with r.dial() as dial:
            dial.conference("TestConferenceAttributes", beep=False, waitUrl="", startConferenceOnEnter=True, endConferenceOnExit=True)
        xml = r.toxml()
        #parse twiml XML string with Element Tree and inspect structure
        tree = ET.fromstring(xml)
        self.assertIsNotNone(tree.find(".//Dial/Conference"))
        #check Conference tag attributes
        conf = tree.find(".//Dial/Conference")
        self.assertEqual(conf.text.strip(), "TestConferenceAttributes")
        self.assertEqual(conf.get('beep'), "false")
        self.assertEqual(conf.get('waitUrl'), "")
        self.assertEqual(conf.get('startConferenceOnJoin'), "true")
        self.assertEqual(conf.get('endConferenceOnExit'), "true")

Note that this tests both the problem with Twilio striping the False, 0, and '' attributes.

It also test the boolean uppercase issue.