webFsCrawlerThread = new Thread((Runnable) () -> {
                    // crawl web
                    writeTimeToSessionInfo(crawlingInfoHelper, Constants.WEB_FS_CRAWLER_START_TIME);
                    webFsIndexHelper.crawl(options.sessionId, webConfigIdList, fileConfigIdList);
                    writeTimeToSessionInfo(crawlingInfoHelper, Constants.WEB_FS_CRAWLER_END_TIME);
                }, WEB_FS_CRAWLING_PROCESS);

            }
        };

        crawler.writeTimeToSessionInfo(helper, "test-key");
        assertTrue(capturedInfo.containsKey("test-key"));
        assertNotNull(capturedInfo.get("test-key"));
    }

    @Test
    public void test_writeTimeToSessionInfo_withNullHelper() {
        // Should not throw exception
        try {
            crawler.writeTimeToSessionInfo(null, "test-key");
        } catch (Exception e) {