crawlerStatsHelper.done(key);
        assertNull(localLogMsg.get());
    }

    @Test
    public void test_beginWithRecordAndDiscard() {
        String key = "test";
        crawlerStatsHelper.begin(key);
        crawlerStatsHelper.record(key, "aaa");
        crawlerStatsHelper.discard(key);
        logger.info(localLogMsg.get());
        assertNull(localLogMsg.get());

        Map<String, Object> map = new HashMap<>();
        map.put("key", null);

        assertNull(MapValueExtractor.getString(map, "key"));
    }

    @Test
    public void testGetString_withMissingKey() {
        Map<String, Object> map = new HashMap<>();

        assertNull(MapValueExtractor.getString(map, "missing"));
    }

    @Test
    public void testGetString_withDefaultValue() {

        assertEquals(25, keyMatchPager.getPageSize());
        assertEquals(1, keyMatchPager.getCurrentPageNumber());
        assertNull(keyMatchPager.id);
        assertNull(keyMatchPager.term);
        assertNull(keyMatchPager.query);
        assertNull(keyMatchPager.versionNo);

        keyMatchPager.setAllRecordCount(999);
        assertEquals(999, keyMatchPager.getAllRecordCount());

        // Verify
        assertNotNull(exception);
        assertNull(exception.getMessage());
        assertNull(exception.getCause());
        assertNull(exception.getMessageCode());
    }

    @Test
    public void test_constructor_twoParametersWithNullMessageCode() {
        // Setup
        final String message = "Query error without message code";

        assertEquals(25, relatedQueryPager.getPageSize());
        assertEquals(1, relatedQueryPager.getCurrentPageNumber());
        assertNull(relatedQueryPager.id);
        assertNull(relatedQueryPager.term);
        assertNull(relatedQueryPager.versionNo);

        relatedQueryPager.setAllRecordCount(999);
        assertEquals(999, relatedQueryPager.getAllRecordCount());

        assertEquals(25, schedulerPager.getPageSize());
        assertEquals(1, schedulerPager.getCurrentPageNumber());
        assertNull(schedulerPager.id);
        assertNull(schedulerPager.name);
        assertNull(schedulerPager.versionNo);

        schedulerPager.setAllRecordCount(999);
        assertEquals(999, schedulerPager.getAllRecordCount());
        schedulerPager.setAllPageCount(999);

        assertEquals(25, searchLogPager.getPageSize());
        assertEquals(1, searchLogPager.getCurrentPageNumber());
        assertNull(searchLogPager.queryId);
        assertNull(searchLogPager.userSessionId);
        assertNull(searchLogPager.requestedTimeRange);
        assertNull(searchLogPager.accessType);
        assertEquals(SearchLogPager.LOG_TYPE_SEARCH, searchLogPager.logType);

        assertEquals(25, userPager.getPageSize());
        assertEquals(1, userPager.getCurrentPageNumber());
        assertNull(userPager.id);
        assertNull(userPager.roles);
        assertNull(userPager.groups);
        assertNull(userPager.versionNo);

        userPager.setAllRecordCount(999);
        assertEquals(999, userPager.getAllRecordCount());
        userPager.setAllPageCount(999);

        Object value = new ValueHolder(list);

        assertNull(ReflectionValueExtractor.evaluate("h.value[", value));
        assertNull(ReflectionValueExtractor.evaluate("h.value[]", value));
        assertNull(ReflectionValueExtractor.evaluate("h.value[a]", value));
        assertNull(ReflectionValueExtractor.evaluate("h.value[0", value));
        assertNull(ReflectionValueExtractor.evaluate("h.value[0)", value));

        assertEquals(25, reqHeaderPager.getPageSize());
        assertEquals(1, reqHeaderPager.getCurrentPageNumber());
        assertNull(reqHeaderPager.id);
        assertNull(reqHeaderPager.name);
        assertNull(reqHeaderPager.versionNo);

        reqHeaderPager.setAllRecordCount(999);
        assertEquals(999, reqHeaderPager.getAllRecordCount());
        reqHeaderPager.setAllPageCount(999);