assertTrue(labels instanceof org.lastaflute.core.message.UserMessages);
    }

    /**
     * Test reflection access to constants
     */
    @Test
    public void test_reflectionAccess() throws Exception {
        Class<?> clazz = FessLabels.class;
        Field field = clazz.getField("LABELS_LOGIN");
        assertNotNull(field);
        assertEquals(String.class, field.getType());