assertEquals("Should extend org.codelibs.core.lang.SystemUtil", "org.codelibs.core.lang.SystemUtil", superClass.getName());
    }

    public void test_constants_reference() {
        // Test that the constant used is accessible and has expected value
        assertEquals("fess.search_engine.http_address", Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS);
    }