private File testDir;

    private File file1;

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {
        super.setUp(testInfo);
        testDir = File.createTempFile("synonymtest", "_dir");
        testDir.delete();
        testDir.mkdirs();
        file1 = new File(testDir, "synonym.txt");
        FileUtil.writeBytes(file1.getAbsolutePath(), "abc=>123\nxyz,890".getBytes(Constants.UTF_8));
    }

            final int pageSize = synonymPager.getPageSize();
            final PagingList<SynonymItem> synonymList = file.selectList((synonymPager.getCurrentPageNumber() - 1) * pageSize, pageSize);

            // update pager
            BeanUtil.copyBeanToBean(synonymList, synonymPager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
            synonymList.setPageRangeSize(fessConfig.getPagingPageRangeSizeAsInteger());