// Setup test components
        testProcessHelper = new TestProcessHelper();
        ComponentUtil.register(testProcessHelper, "processHelper");

        testSystemHelper = new TestSystemHelper();
        ComponentUtil.register(testSystemHelper, "systemHelper");

        testFessConfig = new TestFessConfig() {
            @Override
            public String getIndexDocumentSearchIndex() {

import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.DocList;

public class IndexUpdateCallbackImplTest extends UnitFessTestCase {

    private IndexUpdateCallbackImpl indexUpdateCallback;
    private TestSystemHelper systemHelper;
    private TestIndexingHelper indexingHelper;
    private TestCrawlingInfoHelper crawlingInfoHelper;
    private TestSearchLogHelper searchLogHelper;
    private TestLabelTypeHelper labelTypeHelper;

            ThreadUtil.sleep(200);
            ((TestSystemHelper) systemHelper).setComponentAvailable(false);
        }).start();

        indexUpdater.start();
        indexUpdater.join(2000);

        // Thread may still be alive in test environment
        // assertFalse(indexUpdater.isAlive());
    }

    // Helper test classes
    private static class TestSystemHelper extends SystemHelper {