/**
 * Helper class for sending notifications to various platforms.
 */
public class NotificationHelper {

    /**
     * Default constructor.
     */
    public NotificationHelper() {
        // Default constructor
    }

    private static final Logger logger = LogManager.getLogger(NotificationHelper.class);

    /** Line feed character for message formatting. */
    protected static final char LF = '\n';

            public String getHostname() {
                return "test-hostname";
            }
        };

        FessConfig fessConfig = createTestFessConfig();

        NotificationHelper notificationHelper = new NotificationHelper() {
            // Mock send method
            public void send(final Object postcard) {
                // Mock implementation
            }
        };

                }
                final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
                try {
                    final NotificationHelper notificationHelper = ComponentUtil.getNotificationHelper();
                    SMailCallbackContext.setPreparedMessageHookOnThread(notificationHelper::send);
                    EsStatusPostcard.droppedInto(postbox, postcard -> {

            }

            final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
            final NotificationHelper notificationHelper = ComponentUtil.getNotificationHelper();
            try {
                SMailCallbackContext.setPreparedMessageHookOnThread(notificationHelper::send);
                LogNotificationPostcard.droppedInto(postbox, postcard -> {

        notificationHelper = new NotificationHelper() {
            @Override
            public void send(CardView cardView, SMailPostingDiscloser discloser) {
                // Mock implementation
            }
        };
        ComponentUtil.register(notificationHelper, "notificationHelper");

        postbox = new Postbox() {
            // Mock implementation

import org.junit.jupiter.api.TestInfo;

public class NotificationHelperTest extends UnitFessTestCase {

    private NotificationHelper notificationHelper;

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {
        super.setUp(testInfo);
        notificationHelper = new NotificationHelper();
    }

    @Test
    public void test_sendToSlack_withBlankWebhookUrls() {

import org.codelibs.fess.helper.LanguageHelper;
import org.codelibs.fess.helper.LogNotificationHelper;
import org.codelibs.fess.helper.MarkdownRenderer;
import org.codelibs.fess.helper.NotificationHelper;
import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.PermissionHelper;
import org.codelibs.fess.helper.PluginHelper;
import org.codelibs.fess.helper.PopularWordHelper;

	</component>
	<component name="indexingHelper" class="org.codelibs.fess.helper.IndexingHelper">
	</component>
	<component name="notificationHelper" class="org.codelibs.fess.helper.NotificationHelper">
	</component>
	<component name="logNotificationHelper" class="org.codelibs.fess.helper.LogNotificationHelper">
	</component>

                } else {
                    toAddresses = StringUtil.EMPTY_STRINGS;
                }
                final NotificationHelper notificationHelper = ComponentUtil.getNotificationHelper();
                SMailCallbackContext.setPreparedMessageHookOnThread(notificationHelper::send);
                CrawlerPostcard.droppedInto(postbox, postcard -> {

    private static final int MAX_THROWABLE_LENGTH = 500;

    private static final Set<String> EXCLUDED_LOGGERS = Set.of( //
            "org.codelibs.fess.helper.NotificationHelper", //
            "org.codelibs.fess.util.LogNotificationAppender", //
            "org.codelibs.fess.job.LogNotificationJob", //
            "org.codelibs.fess.timer.LogNotificationTarget", //