assertEquals("L1:aaa\nL2:bbb\nL3:ccc", documentHelper.appendLineNumber("L", "aaa\nbbb\nccc"));
    }

    @Test
    public void test_init() {
        DocumentHelper documentHelper = new DocumentHelper();

        try {
            documentHelper.init();
        } catch (Exception e) {

    }

    private void setupMockComponents() {
        ComponentUtil.setFessConfig(new MockFessConfig());
        ComponentUtil.register(new MockSystemHelper(), "systemHelper");
    }

    @Test
    public void test_init() {
        SearchLogHelper helper = new SearchLogHelper();
        helper.init();

        assertNotNull(helper.userInfoCache);
        assertNotNull(helper.searchLogLogger);
    }

    @Test

        ComponentUtil.register(new SystemHelper(), "systemHelper");
        ComponentUtil.register(new VirtualHostHelper(), "virtualHostHelper");
    }

    @Test
    public void test_init() {
        try {
            keyMatchHelper.init();
        } catch (Exception e) {
            // Expected due to missing dependencies in test environment
            assertNotNull(e);
        }
    }

        assertEquals(0, SambaHelper.SID_TYPE_USE_NONE);
        assertEquals(1, SambaHelper.SID_TYPE_USER);
        assertEquals(5, SambaHelper.SID_TYPE_WKN_GRP);
    }

    @Test
    public void test_init() {
        ComponentUtil.setFessConfig(new MockFessConfig());
        sambaHelper.init();
        assertNotNull(sambaHelper.fessConfig);
    }

    @Test

        ComponentUtil.register(new MockFessConfig(), "fessConfig");

        inject(relatedQueryHelper);
        inject(virtualHostHelper);
    }

    @Test
    public void test_init() {
        // Setup test data
        List<RelatedQuery> testData = new ArrayList<>();
        testData.add(createRelatedQuery("test", new String[] { "related1", "related2" }, ""));
        mockBhv.setTestData(testData);

        ComponentUtil.register(new MockSystemHelper(), "systemHelper");
        ComponentUtil.register(new MockPopularWordHelper(), "popularWordHelper");
    }

    @Test
    public void test_init() {
        SuggestHelper helper = new SuggestHelper();
        try {
            helper.init();
            assertNotNull(helper.suggester());
        } catch (Exception e) {
            assertTrue(true);
        }

                } else {
                    file.delete();
                }
            }
        }
        dir.delete();
    }

    // Test initialization
    @Test
    public void test_init() {
        assertNotNull(thumbnailManager.baseDir);
        assertTrue(thumbnailManager.baseDir.exists());
        assertTrue(thumbnailManager.baseDir.isDirectory());

        indexUpdateCallback.init();
    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        super.tearDown(testInfo);
    }

    @Test
    public void test_init() {
        // Test initialization
        assertEquals(1048576L, indexUpdateCallback.maxDocumentRequestSize);
        assertEquals(10000, indexUpdateCallback.maxDocumentCacheSize);
    }

    @Test

        assertFalse(roleQueryHelper.encryptedCookieValue);

        roleQueryHelper.setMaxAge(300);
        assertEquals(300, roleQueryHelper.maxAge);
    }

    @Test
    public void test_init() {
        final RoleQueryHelper roleQueryHelper = new RoleQueryHelper();

        assertEquals(0, roleQueryHelper.defaultRoleList.size());

        roleQueryHelper.init();

    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        ComponentUtil.setFessConfig(null);
        super.tearDown(testInfo);
    }

    @Test
    public void test_init() {
        // Test initialization with null fields
        queryFieldConfig.init();

        // Verify response fields are initialized
        assertNotNull(queryFieldConfig.getResponseFields());