// nothing
            if (logger.isInfoEnabled()) {
                logger.info("No crawling target data.");
            }
            return;
        }

        doCrawl(sessionId, configList);
    }

    /**
     * Initiates crawling for specific data configurations.
     * This method starts crawling only for the data configurations
     * specified in the configIdList parameter.

        } finally {
            System.setErr(originalErr);
        }
    }

    // Test doCrawl method
    @Test
    public void test_doCrawl_withAllNull() {
        Crawler.Options options = new Crawler.Options();
        options.sessionId = "test-session";

        int result = crawler.doCrawl(options);
        assertEquals(Constants.EXIT_OK, result);
    }

    @Test