'Given a ``HttpResponse`` coming back from using the ``client``, assert
that you get back:
* An HTTP 200
* The correct content-type (``application/xml``)
* The content is valid XML'

def assertValidXMLResponse(self, resp):

    self.assertHttpOK(resp)
    self.assertTrue(resp[u'Content-Type'].startswith(u'application/xml'))
    self.assertValidXML(force_text(resp.content))
