public abstract Map<String, String> properties(final Map<String, String> defaultProperties, final long additionalRetentionMs);
@Test
    public void shouldAugmentRetentionMsWithWindowedChangelog() {
        final WindowedChangelogTopicConfig topicConfig = new WindowedChangelogTopicConfig("name", Collections.emptyMap(), 10);
        assertEquals("30", topicConfig.properties(Collections.emptyMap(), 20).get(TopicConfig.RETENTION_MS_CONFIG));
    }