How to Add Visual Testing to Existing Selenium Tests

Tool that is used to automate testing. It is mostly used to test software on their functional aspects and is not optimized to add testing in their visual aspects. There is a strong misconception within the sector on the ease of automating visual testing. These opinions are unfounded since the automation of visual testing is not extremely challenging. Therefore, while virtually every component of testing today is automatic, a great deal manual testing tutorial of enterprises still employ the use of manual testing in regards to visuals. This forms a bottleneck for these organizations when it comes to achieving continuous deployment. Automating visual testing is rather simplistic. Automation is also possible for both new and existing Selenium tests.

What is Visual Testing?

It is Defined as the act of inspecting a program's graphical user interface [GUI] and ensuring it is displayed as intended. It is also sometimes labelled as visual checking or visual regression testing. As the name suggests, the objective of visual testing is to find visual errors. Errors such as misalignment of items, font, layout, rendering issues, etc.. It can also be implemented to verify the content onto a page, making it rewarding for sites with high graphical functionality [charts, graphs, dashboards, etc.].

Since Selenium isn't designed to examine visual appearance and/or the CSS-Code right, other approaches have to be considered:

By defining design guides

Document Object Model [DOM] contrast

By running a screenshot comparison

By checking the syntax of CSS and HTML

The Comparison using the screenshot process is the simplest to implement. With the use of a third party software, like Applitools Eyes, one can add testing checks even into existing Selenium tests. The many variables involved magnify the operational sophistication, but implementing the other present open source/commercial solutions makes Visual Testing possible. It adds tremendous value and is also becoming easier to execute every passing day.

How does this work?

Let us Consider just one automated visual test. During the evaluation one page is considered and each distinct element displayed on it's verified to leave properly. Therefore, on a single page, countless items are checked for a variety of attributes [position, overlaps, erroneous rendering, etc.]. A single visual test directly translates into a hundred distinct verifications. This process repeats itself with every different visual evaluation. It may then be scaled to every browser, operating system, device, screen resolution, etc.. Taking one a few steps closer to constant shipping.

There Though They May Be distinct from each other, all of them follow variants of these workflow:

1.

2. Compare the screenshot shot with a'baseline' picture. [A representative picture for the intended GUI]

3. Report the gaps, if any

4. Update the baseline picture as required

Every time a script is run, a screenshot is taken. A screenshot taken originally becomes the baseline image used for comparisons in the software testing course future. Every succeeding run, the newer screenshot is confirmed to be within the mismatch tolerance limit specified for the baseline picture. If the mismatch exceeds the tolerance limits, the script fails. Once the script fails enough times, the baseline picture can be updated automatically to ensure it reflects the newest edition of the GUI, but only when instructed to do so. With this method, Visual Test automation can be readily incorporated into existing Selenium evaluations too, and the shortened development cycle makes continuous development easier.

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