assertEquals("", fieldsStr);
        String[] fields = fieldsStr.isEmpty() ? new String[0] : fieldsStr.split(",");
        assertEquals(0, fields.length);
    }

    @Test
    public void test_indexAdminRequiredFields() {
        String[] fields = fessConfig.getIndexAdminRequiredFields().split(",");
        assertEquals(4, fields.length);
        assertEquals("url", fields[0]);
        assertEquals("title", fields[1]);