assertTrue(org.lastaflute.core.message.UserMessages.class.isAssignableFrom(FessLabels.class));
    }

    /**
     * Test field count to ensure no unexpected fields are added
     */
    public void test_fieldCount() throws Exception {
        Field[] fields = FessLabels.class.getDeclaredFields();
        int labelConstantCount = 0;
        int serialVersionUIDCount = 0;

        for (Field field : fields) {