'Testing an unavailable RSS feed'

@deferred(timeout=8)
def test_rss_unavailable(self):

    url = ('http://localhost:%s/err503' % self.file_server_port)
    self.boosting_manager.add_source(url)
    rss_obj = self.boosting_manager.get_source_object(url)
    rss_obj._on_error_rss = self._on_error_rss
    rss_obj.start()
    return self.rss_error_deferred
