• A/B Testing - Quality Assurance

    Table of contents

    In short

    Quality assurance (QA) of A/B tests before they go live is essential to detect potential bugs early on. This not only enhances the user experience, but also prevents data corruption that could result from technical errors.

    How to perform your QA

    QA with the help of the preview link - individual pages

    As soon as you have created a variant, it appears as an experiment in the dashboard. There is a "Preview" button on the variant itself. If you click on this, a new tab opens with the variant.

    A parameter has been appended to the URL: ?varify-preview="Experiment name". You can append this parameter to other URLs to display the variant on different pages.


    You have created a variant on a product detail page. You now open this directly via the "Preview" button. Now you want to run the experiment on several product detail pages. To check that the experiment is also carried out on another product detail page, you can set the parameter ?varify-preview="Experiment name" copy and attach to other product detail pages 

    parameter - in this example: ?varify-preview=optimize-news-bar-en and append it to the URL of your other product detail pages where you want to test the variant.

    -> https://www.demoshop.de/produkt1?varify-preview=optimize-news-bar-en

    -> https://www.demoshop.de/produkt2?varify-preview=optimize-news-bar-en

    -> https://www.demoshop.de/produkt3?varify-preview=optimize-news-bar-en

    QA via audience targeting - page-wide

    Step-by-step tutorial
    QA without using a testing parameter

    Quality assurance (QA) using the Varify testing parameter offers a quick and easy way to display and test a created variant. However, if tests take place on different pages, or in a store, and various other parameters are attached to a URL, e.g. through filters, it can quickly become cumbersome to perform QA with the parameter settings and the testing parameter.

    The solution: Start an experiment so that it is only played with a specific session storage entry. This way, you can test without parameters and your users won't see the test yet.

    This is how you proceed:

    1. set your experiment from Parameter to "A/B test" um.

    2. copy the following code into the audience targeting of your experiment and click on "Save".

    					const STORAGE_KEY = 'varify-test';
    const STORAGE_VALUE = 'true';
    return isValueMatched = sessionStorage.getItem(STORAGE_KEY) === STORAGE_VALUE;

    3. set the traffic distribution of your experiment to 100%

    4. start the experiment via the "Start Experiment" button. Don't worry, your users will not be able to see the experiment due to the audience targeting that has been set.

    Now you need to create a session storage entry in your browser, which will ensure that the experiment is played to you.

    You can either do this manually, or you can use our Varify.io Chrome extension.

    Once you have installed and activated the extension, you can easily activate a session storage by clicking the "Activate Quality Assurance" button. Then click on "Activate" to set the session storage. A green or red dot will then show you whether the session storage is activated or not.

    Please note that the session storage will be removed as soon as you click on "Deactivate", turn off the switch or end your session.

    1. open the developer console of your browser (this example is intended for the Chrome browser, in other browsers the session storage may be set differently).

    2. go to the "Application" tab.

    3. click on "Session Storage" and below it on the URL of your website (you may have to expand the list by clicking on the small triangle symbol).

    4. click in the "Key" column below the last Session Storage entry to enter "varify-test". Confirm with Enter.

    5. repeat the process in the "Value" column and enter "true" here. Confirm again with Enter.

    6. reload the page afterwards.

    Now you can see the variant and test it extensively, as the experiment is played out to you based on the audience targeting set in combination with the session storage entry. Please note that the session storage is deleted when the session ends, so you will have to create the session storage again for a new session.

    If your variant works as desired, you can make it live for your users. Don't forget to reset the distribution to 50% and remove audience targeting.

    QA using page targeting - individual pages

    Step-by-step tutorial
    QA with audience targeting

    For QA using page targeting, start the experiment and append "?varify-testing=true" as a parameter to the URLs automatically. Simply add the URLs to be tested to the page targeting area and append the QA parameter "?varify-testing=true" to them. Set the targeting type for each URL to "Contains".

    After you have done this, change the Traffic distribution for the variation on 100% and start the A/B test. Don't worry, because the variant is only displayed if the URL is called up together with the QA parameter.

    Depending on your audience targeting settings, you can now test your experiment directly in the browser by simply calling up the URL with the QA parameter. If you want to test additional pages, you can simply add them in the page targeting area. Once you have carried out the QA, you should remember to set the traffic distribution back to the desired ratio, e.g. 50:50.

  • First steps

    Tracking & Evaluation



    Function overview