//                                  Application Variable
    //                                  --------------------
    /**
     * Set the value of hostname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param hostname The parameter value of hostname. (NotNull)
     */
    public void setHostname(String hostname) {

    // Test insert with no chains
    @Test
    public void test_insert_noChains() {
        User user = createTestUser("testuser");
        authenticationManager.insert(user);
        // Should not throw exception even with no chains
    }

    // Test insert with single chain
    @Test
    public void test_insert_singleChain() {
        User user = createTestUser("testuser");

    }

    @Test
    public void test_isValid_basic() {
        final CustomSize annotation = createBasicAnnotation();
        validator.initialize(annotation);

        // Test that the method can be called (even if context handling is complex)
        try {
            final boolean result = validator.isValid("test", null);
            assertNotNull(Boolean.valueOf(result), "isValid should return a boolean result");

        FessIntervalController controller = new FessIntervalController();
        controller.setDelayMillisForWaitingNewUrl(0L); // Set to 0 to avoid actual delay

        // This should not throw any exceptions even if helpers are not available
        try {
            // Note: In unit test environment, ComponentUtil may not be fully initialized
            // The improved error handling should catch and log any exceptions

            params(name)
            params("${providedBy.size}")
        }
    }

    /**
     * For all modules providing a capability, always use the preferred module, even if there's no conflict.
     * In other words, will forcefully upgrade all modules providing a capability to a selected module.
     *
     * @param to the preferred module
     */
    private

        String result = popularWordHelper.getCacheKey(seed, tags, roles, fields, excludes);

        assertNotNull(result);
        assertTrue(result.contains("test_seed"));

        // Should contain 4 separators even with null arrays
        long separatorCount = result.chars().filter(ch -> ch == '\n').count();
        assertEquals(4, separatorCount);
    }

    @Test
    public void test_getCacheKey_emptyArrays() {

        Crawler.Options options = new Crawler.Options();
        options.sessionId = "test-session";
        options.expires = "invalid";

        // Verify the expires value is set even if invalid
        assertEquals("invalid", options.expires);
    }

    @Test
    public void test_process_withName() throws Exception {
        // Test that name is properly set

            public String getCrawlerDocumentMimetypeExtensionOverrides() {
                return ".sql=text/x-sql";
            }
        });

        mimeTypeHelper.init();

        // Override works even without an input stream
        assertEquals("text/x-sql", mimeTypeHelper.getContentType(null, "test.sql"));
    }

    @Test
    public void test_getContentType_overridePriority() throws IOException {

            processor.setSearcher(new TestSearcher(100));
            processor.register(new SlowSearcher(100)); // 100ms delay
            processor.init();

            // Should complete even with slow searcher
            final long startTime = System.currentTimeMillis();
            final List<Map<String, Object>> results = processor.search("*", new TestSearchRequestParams(0, 10, 0), OptionalThing.empty());

        direction.directLoggingTitle(fessConfig.getDomainTitle(), fessConfig.getEnvironmentTitle());

        // this configuration is on sea_env.properties because it has no influence to production
        // even if you set true manually and forget to set false back
        direction.directFrameworkDebug(fessConfig.isFrameworkDebug()); // basically false

        // you can add your own process when your application is booting or closing