@Override
    public long retrieveInitialSequence() {
        // -1 indicates start from next message.
        return -1;
    }
@Test
    public void retrieveInitialSequence() {
        MessageListener<String> listener = createMessageListenerMock();
        ReliableMessageListenerAdapter<String> adapter = new ReliableMessageListenerAdapter<>(listener);

        assertEquals(-1, adapter.retrieveInitialSequence());
    }