TopicFilter topicFilter() {
        return getConfiguredInstance(TOPIC_FILTER_CLASS, TopicFilter.class);
    }
@Test
    public void testListOfTopics() {
        MirrorSourceConfig config = new MirrorSourceConfig(makeProps("topics", "topic1, topic2"));
        assertTrue(config.topicFilter().shouldReplicateTopic("topic1"), "topic1 created from list should exist");
        assertTrue(config.topicFilter().shouldReplicateTopic("topic2"), "topic2 created from list should exist");
        assertFalse(config.topicFilter().shouldReplicateTopic("topic3"), "topic3 created from list should exist");
    }