// Test constant fields
    public void test_constantFields() {
        // Test error message constants
        assertEquals("{errors.front_header}", FessMessages.ERRORS_front_header);
        assertEquals("{errors.front_footer}", FessMessages.ERRORS_front_footer);
        assertEquals("{errors.front_prefix}", FessMessages.ERRORS_front_prefix);
        assertEquals("{errors.front_suffix}", FessMessages.ERRORS_front_suffix);