GroupFilter groupFilter() {
        return getConfiguredInstance(GROUP_FILTER_CLASS, GroupFilter.class);
    }
@Test
    public void testGroupMatching() {
        MirrorCheckpointConfig config = new MirrorCheckpointConfig(makeProps("groups", "group1"));
        assertTrue(config.groupFilter().shouldReplicateGroup("group1"),
                "topic1 group matching property configuration failed");
        assertFalse(config.groupFilter().shouldReplicateGroup("group2"),
                "topic2 group matching property configuration failed");
    }