assertNotNull(FessConfig.CRAWLER_DATA_SERIALIZER);
        assertEquals("crawler.data.serializer", FessConfig.CRAWLER_DATA_SERIALIZER);
    }

    // Test the get method directly
    @Test
    public void test_getMethod() {
        assertEquals("Fess", fessConfig.get(FessConfig.DOMAIN_TITLE));
        assertEquals("default", fessConfig.get(FessConfig.search_engine_TYPE));

        assertEquals("[Prod]", customEnv.getMailSubjectTestPrefix());
        assertEquals("******@****.***", customEnv.getMailReturnPath());
    }

    // Test get method with custom property
    public void xtest_getMethod() {
        FessEnv.SimpleImpl customEnv = new FessEnv.SimpleImpl() {
            protected Properties prepareProperties() {
                Properties props = new Properties();