assertTrue(result.contains("data4"));
    }

    public void test_Options_toString() {
        Crawler.Options options = new Crawler.Options();
        options.sessionId = "session123";
        options.name = "testCrawl";
        options.webConfigIds = "web1,web2";
        options.fileConfigIds = "file1";
        options.dataConfigIds = "data1";
        options.propertiesPath = "/path/to/props";

        assertEquals(3, indexUpdater.finishedSessionIdList.size());
        assertTrue(indexUpdater.finishedSessionIdList.contains("session1"));
        assertTrue(indexUpdater.finishedSessionIdList.contains("session2"));
        assertTrue(indexUpdater.finishedSessionIdList.contains("session3"));
    }

    // Test run method with null DataService
    public void test_run_nullDataService() {

```java
// Create multiple crawler instances
Crawler crawler1 = container.getComponent("crawler");
crawler1.setSessionId("session1");
crawler1.addUrl("https://site1.com");

Crawler crawler2 = container.getComponent("crawler");  
crawler2.setSessionId("session2");
crawler2.addUrl("https://site2.com");

// Execute concurrently
crawler1.setBackground(true);
crawler2.setBackground(true);

		Test: func(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error) {
			sql, _ := fc()
			modifySql = append(modifySql, sql)
		},
	}
	session2 := DB.Session(&gorm.Session{Logger: tracer2})
	err := session2.Table("migrate_decimal_columns").Migrator().AutoMigrate(model2)
	if err != nil {
		t.Fatalf("failed to get column types, got error: %v", err)
	}
	return modifySql
}