source.put("aaa", "a");
        source.put("bbb", "a");
        assertTrue(fessConfig.validateIndexRequiredFields(source));
    }

    @Test
    public void test_getCrawlerDocumentSpaceCharsAsArray() {
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getCrawlerDocumentSpaceChars() {