The Role of Visual Regression Testing in App Development

In a digital world cluttered with millions of applications, providing the best possible user experience is crucial for a business to remain competitive. As per Forbes, around 38% of users will prefer to stop interacting with a website that offers an unattractive layout and poor content. So, the user experience decides whether a user will stay or leave due to a poor experience.

Inconsistencies in visual aspects related to fonts, buttons, or screen resolution can cause potential customers to leave your website. These tiny flaws in your software can lead to huge revenue losses in the long run. This is why conducting visual regression testing is important. Visual regression testing ensures that your website or mobile application performs and looks exactly as it should. In this article, we walk you through the visual regression testing process and discuss the significance it has in app development.

What is Visual Regression Testing and Its Importance

Having an exemplary user experience ensures you build trust and credibility with your user base and reinforces your brand image. Hence, by using a reliable technique like visual regression testing, you can catch visual errors and defects early before they reach the production stage. Through this technique, you can check whether code modifications have affected the application’s visual interface.

Visual testing is used along with other types of testing, like usability testing or functional testing, to ensure the application meets the expected quality standards. It is also becoming an important part of AI regression testing for detecting visual issues quickly. It is required in situations where frequent changes are made to a website or application that need to be closely monitored.

3 Key Benefits of Visual Regression Testing

By conducting visual regression testing, you gain these benefits:

1) Reduced costs

Visual regression testing ensures that visual bugs are caught early in the development stage. With TestGrid, teams can automate these visual checks across browsers and devices to catch UI changes earlier in the testing cycle. This prevents costly rectifications that may be needed later when bugs are discovered after release or post-production.

2) Improved user experience

Through visual testing, you ensure the UI is visually appealing and always consistent, offering a good user experience. It also entices the user to pay attention to specific page elements.

3) High product quality

By conducting this testing, you ensure that your product meets the anticipated quality standards, ultimately leading to greater customer satisfaction and repeat business.

The Visual Regression Process And Its Different Techniques

Let us now look at the different methods used to perform visual regression testing:

1) Manual Visual testing

This method, done manually without using any automated tool, has disadvantages with respect to time, cost, and inconsistency. It is too tedious and slow, and the human error factor is also a drawback.

2) Pixel-by-pixel comparison

In this approach, you compare two screenshots and analyze them at a pixel level. It is done at a very minute level, and hence, when inconsistencies occur, the test engineers are alerted in time. However, they may also highlight negligible issues that are irrelevant for usability.

3) DOM comparison

The Document Object Model testing process verifies the user interface by analyzing the HTML structure. It detects inconsistencies in layout and missing elements.

4) Layout comparison

In this method, the size and position of user interface elements are compared instead of pixels. However, the test fails if the size or position of an element changes.

5) Visual AI comparison

It comprises using two images through ML and AI to detect inconsistencies in a web application’s UI. AI in mobile testing can make this process more effective by identifying visual regressions such as layout shifts, incorrect fonts, and misaligned UI elements. This technique can help reduce false positives.

6) Inserting implicit visual validation

This method uses the browser’s built-in validation capabilities to check the UI’s visual state.

Deciding Between Manual And Automated Visual Regression Testing

Manual visual regression testing

It can be a good practice to conduct manual testing at the start of development. However, the testing process grows with every new feature and functionality added to the application. This increases the amount of time spent by human testers to analyze screenshots to determine bugs and inconsistencies. When there are tight deadlines, manual testing is impractical.

Automated visual regression testing

It is faster and more efficient since you can automate the checking of every page after every code change. It is less prone to human errors and offers better cost efficiency in the long haul. Opting for an AI-powered visual testing tool is an intelligent option. You can even choose to balance between manual and automated testing and derive the benefits of both testing types.

Conclusion

Visual regression testing is indispensable in app development since it assures that the application you are developing remains defect-free even after modifications. It ensures that the app’s features are not affected in any way due to recent code changes.

With an AI-powered automation testing platform like TestGrid, you can detect even the minutest variations in appearance, guaranteeing perfect precision across different devices and browsers.

One key advantage of conducting visual testing with TestGrid is that you can test visual changes in mobile apps and websites without having to add any external SDK or alter your functional test case code. All you have to do is insert a few lines of code. The rest will be efficiently taken care of by TestGrid’s AI. TestGrid’s cost-efficiency, scriptless testing, greater speed, and higher accuracy make it the most preferred tool for all your testing needs, including visual testing.

With TestGrid, seamlessly validate every element in your application’s interface, including text, images, layouts, videos, and more, and eliminate the risk of visual bugs finding their way into production.