"HotThreadMonitorTarget should extend MonitorTarget");
        assertTrue(TimeoutTarget.class.isAssignableFrom(HotThreadMonitorTarget.class),
                "HotThreadMonitorTarget should implement TimeoutTarget");
    }

    @Test
    public void test_constructor() {
        assertNotNull(target, "Constructor should create instance");

        assertTrue(MonitorTarget.class.isAssignableFrom(SystemMonitorTarget.class), "SystemMonitorTarget should extend MonitorTarget");
        assertTrue(TimeoutTarget.class.isAssignableFrom(SystemMonitorTarget.class), "SystemMonitorTarget should implement TimeoutTarget");
    }

    @Test
    public void test_constructor() {
        assertNotNull(target, "Constructor should create instance");

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.timer.TimeoutTarget;
import org.codelibs.fess.helper.LogNotificationHelper;
import org.codelibs.fess.helper.LogNotificationHelper.LogNotificationEvent;
import org.codelibs.fess.opensearch.client.SearchEngineClient;

        assertNotNull(helper);
    }

    @Test
    public void test_init_and_destroy() {
        LogNotificationHelper helper = new LogNotificationHelper();
        // init() registers a TimeoutTarget with TimeoutManager
        helper.init();
        // destroy() cancels the task and flushes; should not throw
        helper.destroy();
    }

    @Test
    public void test_destroy_beforeInit() {