final CoordinatorHelper helper = createCapturingHelper("node1@host1", null, null, createMockResponse(200, searchResponse));
        setLastEventCheckTime(helper, 4000L);

        helper.fetchNewEvents();

        // lastEventCheckTime should be max(createdTime) + 1 = 7001
        assertEquals(7001L, getLastEventCheckTime(helper));
    }

    @Test

        LogNotificationHelper helper = new LogNotificationHelper();
        // destroy() without init() should not throw NPE because of null checks
        helper.destroy();
    }

    @Test
    public void test_init_destroy_multipleRounds() {
        LogNotificationHelper helper = new LogNotificationHelper();
        helper.init();
        helper.destroy();
        // Second round
        helper.init();

        assertNotNull(helper.duplicateHostList);
        assertEquals(1, helper.duplicateHostList.size());
        assertEquals("www.test.com", helper.duplicateHostList.get(0).getRegularName());
    }

    @Test
    public void test_add_withNullList() {
        DuplicateHostHelper helper = new DuplicateHostHelper();
        helper.duplicateHostList = null;

import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.PermissionHelper;
import org.codelibs.fess.helper.PluginHelper;
import org.codelibs.fess.helper.PopularWordHelper;
import org.codelibs.fess.helper.ProcessHelper;
import org.codelibs.fess.helper.ProtocolHelper;
import org.codelibs.fess.helper.QueryHelper;
import org.codelibs.fess.helper.RateLimitHelper;

        // Test default state
        assertTrue(helper.isCrawlerRunning());

        // Test setting to false
        helper.setCrawlerRunning(false);
        assertFalse(helper.isCrawlerRunning());

        // Test setting back to true
        helper.setCrawlerRunning(true);
        assertTrue(helper.isCrawlerRunning());
    }

    @Test

### Service
- Inject behaviors (Bhv) for data access
- Use `OptionalEntity<T>` for nullable returns
- Plain classes (no extends/implements)

### Helper
- Stateless utility classes
- Access via `ComponentUtil.getXyzHelper()`
- Named with "Helper" suffix

### DBFlute Generated Code
```
opensearch/{index}/
├── bsentity/, bsbhv/    # Base classes (DO NOT EDIT)

import org.codelibs.fess.helper.LabelTypeHelper;
import org.codelibs.fess.helper.OsddHelper;
import org.codelibs.fess.helper.PopularWordHelper;
import org.codelibs.fess.helper.QueryHelper;
import org.codelibs.fess.helper.RoleQueryHelper;
import org.codelibs.fess.helper.SearchHelper;
import org.codelibs.fess.helper.UserInfoHelper;
import org.codelibs.fess.mylasta.action.FessUserBean;

    }

    // Helper method to access the super.toString() for verification,
    // as we cannot call it directly from the test.
    // This requires a package-private or public method in the class under test,
    // or we can just check for the prefix and suffix.
    // For this test, I'll add a helper in the response class to get super.toString()

  private static final AtomicHelper ATOMIC_HELPER;

  private static final LazyLogger log = new LazyLogger(AggregateFutureState.class);

  static {
    AtomicHelper helper;
    Throwable thrownReflectionFailure = null;
    try {
      helper = new SafeAtomicHelper();
    } catch (Throwable reflectionFailure) { // sneaky checked exception
      // Some Android 5.0.x Samsung devices have bugs in JDK reflection APIs that cause

import org.codelibs.fess.Constants;
import org.codelibs.fess.app.web.base.login.FessLoginAssist;
import org.codelibs.fess.helper.AccessTokenHelper;
import org.codelibs.fess.helper.ActivityHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.mylasta.action.FessHtmlPath;
import org.codelibs.fess.mylasta.action.FessMessages;