// Verify - should return empty when parameter name is blank
        assertFalse(result.isPresent());
    }

    // Test findBusinessLocale with null parameter name
    public void test_findBusinessLocale_withNullParameterName() {
        // Setup mock config with null parameter name
        FessConfig mockConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getQueryBrowserLangParameterName() {