/** Helper for OpenSearch Description Document (OSDD) functionality. */
    @Resource
    protected OsddHelper osddHelper;

    /** Helper for managing popular search words and suggestions. */
    @Resource
    protected PopularWordHelper popularWordHelper;

    /** Client for RAG chat functionality. */
    @Resource
    protected ChatClient chatClient;

    public void test_basic_functionality() {
        // Basic functionality test without complex operations
        try {
            List<String> emptyIds = new ArrayList<>();
            dataIndexHelper.crawl("basic-test", emptyIds);
            assertTrue("Basic functionality should be fast", true);
        } catch (Exception e) {
            assertTrue("Basic functionality should handle exceptions quickly", true);
        }
    }

A powerful Java library that provides intelligent search suggestion functionality built on top of OpenSearch/Elasticsearch. It offers auto-completion, query suggestions, and popular word analytics for search applications.

## Key Features

        assertEquals("test", queryWithoutSort);
    }

    @Test
    public void test_quote() {
        // Test quote functionality through the builder behavior
        assertEquals("test", getQuery("test", new String[0], Collections.emptyMap(), Collections.emptyMap(), false));

=== Good practices

==== What kind of tests should I write?

Unit tests are the preferred way to test some functionality: most of the time
they are simpler to understand, more likely to reproduce, and unlikely to be
affected by changes that are unrelated to the piece of functionality that is
being tested.

The reason why `ESSingleNodeTestCase` exists is that all our components used to

    logger.error("Class not found: " + className, e);
}
```

## 🏗️ Architecture & Design Patterns

### Core Design Principles
CoreLib follows a **utility-class pattern** where most functionality is exposed through static methods:

- **Assertion-based validation** - All methods validate inputs using `AssertionUtil.assertArgumentNotNull()` and `AssertionUtil.assertArgumentNotEmpty()`

import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * Unit tests for the {@link AbstractUpgradeGoal} class.
 * Tests the shared functionality across upgrade goals including option handling,
 * .mvn directory creation, and upgrade orchestration.
 */
@DisplayName("AbstractUpgradeGoal")
class AbstractUpgradeGoalTest {

    @TempDir
    Path tempDir;

import jakarta.annotation.Resource;

/**
 * The assist for login handling in the Fess application.
 * This class extends TypicalLoginAssist to provide Fess-specific login functionality
 * including user authentication, permission checking, and login history management.
 *
 */
public class FessLoginAssist extends TypicalLoginAssist<String, FessUserBean, FessUser> // #change_it also UserBean

import com.orangesignal.csv.CsvWriter;

import jakarta.annotation.Resource;

/**
 * Service class for managing elevate words functionality.
 * Elevate words are used to boost the relevance of documents containing specific terms in search results.
 * This service provides CRUD operations, CSV import/export, and related functionality.
 */
public class ElevateWordService {

    /** Logger instance for this class */

import org.junit.jupiter.api.Test;

import jcifs.CIFSContext;
import jcifs.config.PropertyConfiguration;
import jcifs.context.BaseContext;
import jcifs.smb.SmbTransportInternal;

/**
 * Integration tests for RDMA functionality.
 *
 * This class contains both unit tests (that always run) and integration tests
 * (that require system properties to be set for execution).
 *
 * Integration tests require system properties: