public class FileListIndexUpdateCallbackImplTest extends UnitFessTestCase {
    public FileListIndexUpdateCallbackImpl indexUpdateCallback;

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {
        super.setUp(testInfo);
        indexUpdateCallback = new FileListIndexUpdateCallbackImpl(null, null, 1);
    }

    /** Case 1: Normal merge (no duplicates) */
    @Test