def METHOD_NAME(self):
    source = self.get_source(xmlns=GENERIC_XMLNS)
    self.assertNotIn(self.form.xmlns, source)
    save_xform(self.app, self.form, source.encode('utf-8'))
    self.assertIn(self.form.xmlns, self.form.source)
    self.assertNotEqual(self.form.xmlns, GENERIC_XMLNS)