Thursday, May 9, 2013

Automated Website Testing with FiddlerCore

There are various UI automation tools to automate your website and validate the UI. However, it’s also important to capture and validate the network traffic. This can be done using FiddlerCore. You can also perform various types of testing like low bandwidth testing, mobile device testing and localization testing using FiddlerCore.

You can download FiddlerCore from http://fiddler2.com/fiddlercore

To start FiddlerApplication, call FiddlerApplication.Startup(0, FiddlerCoreStartupFlags.Default);

Capture Network Traffic


You can capture the network traffic in a list and then perform various validations like checking for response time, response string, etc. for the captured sessions.
List<Session> _sessions = new List<Session>();

FiddlerApplication.BeforeRequest += delegate(Session oSession)

            {

                Monitor.Enter(_sessions);

                _sessions.Add(oSession);

                Monitor.Exit(_sessions);

            };

Simulate Modem Speeds


You can add a delay of specific milliseconds per KB uploaded as well as for per KB downloaded. This simulates a slow network and can be used to test scenarios where specific requests shouldn’t be made on a slow network. For example, Yahoo mail downloads an image on good network but doesn’t on a slow network.

High Bandwidth

 Low Bandwidth
 
FiddlerApplication.BeforeRequest += delegate(Session oSession)

            {

                if (!_applyrule) return;

                oSession["request-trickle-delay"] = sendDelayinMillisecPerKb;

                oSession["response-trickle-delay"] = receiveDelayinMillisecPerKb;

            };

Mobile Device Testing


Most websites rely on the User Agent string to determine if a request is coming from a mobile device. Hence to test the behavior of a website on a mobile device, corresponding User Agent is set using the Fiddler proxy. For example, when you send the user agent for WP 7.5 i.e. Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0; Microsoft; XDeviceEmulator) , Gmail looks different than that on IE 9

Internet Explorer 9

 
Windows Phone 7.5

 
FiddlerApplication.BeforeRequest += delegate(Session oSession)

            {

                if (_applyrule)

                {

                    oSession.oRequest["User-Agent"] = userAgent;

                }

            };

Localization Testing


Localization testing can be performed by requesting the content in a specific language. This is done by modifying the Accept-Language header using the Fiddler proxy. For example, Hotmail looks the opposite for English and Hebrew Language.

English (en-US)
 

Hebrew (he)

 
FiddlerApplication.BeforeRequest += delegate(Session oSession)

            {

                if (_applyrule)

                {

                    oSession.oRequest["Accept-Language"] = languageAbbreviation;

                }

            };

 

2 comments:

  1. I have a website and I would like to monitor the traffic on the website using fiddler. Assume that the site is being used by my vendor(single user), can I use FiddlerCore to save the Fiddler sessions on my server as a log? Basically i would like the Fiddler trace of all the activities done on my website by that vendor.

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  2. Yes, you can do this by running FiddlerCore on the client machine from where the user is performing the activities.

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