String twitterMessageId = UUID.randomUUID().toString();
TwitterMessage message = new TwitterMessage(twitterMessageId, DEFAULT_USER_ID, TWITTER_MESSAGE_WILLFAIL_MESSAGE, MessageDelivery.INQUEUE, new DateTime(0), null);
storeTwitterMessage(message);
UUID envelopeId = UUID.randomUUID();
MessageEnvelope envelope = new MessageEnvelope(envelopeId.toString(), null, twitterMessageId, null, 0, null, null, now.nHourAfter(1), now, null);
queueEnvelope(envelope);
new SendMessageEnvelopeTask().run();
// |modified| should not be changed.