Enabling continuous deployment of pixel-perfect user interfaces
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Modern organizations invest vastly on designing top-notch visual user interfaces that improve their credibility, strengthen their brand and help them win new customers, but how do they ensure that they look flawless when delivered to the end users? How do they prevent regressions and visual defects given all the possible combinations of devices, platforms, browsers, screen sizes and resolution that proliferate from day to day? Those who care enough often use dedicated, manual QA stages that inevitably introduce delays in the deployment pipelines and cost a great deal of resources and time. Those who, on the other hand, leave this aspect unaddressed, incur the risk of exposing defective interfaces that negatively impress their audience, often times losing them to competitors. We present an approach to visual testing that is completely automated and integrated into a continuous deployment pipeline, capable of blocking visual regressions and defects at early development stages thus saving resources, costs and reducing the time needed to deliver impeccable user interfaces. A live demo will highlight all the steps involved, from design to deployment, using GitLab, Python, Selenium and Docker.
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Enabling continuous deployment of pixel-perfect user interfaces
- 1. Enabling continuous deployment of pixel-perfect user interfaces Stefano Rago
- 2. Stefano Rago DevOps Engineer at @helmoltz
- 3. Topics • The importance of UX / UI • Issues and challenges • An approach based on TDD • Integrating automated tests into CI/CD
- 4. UX / UI • UX Design encompasses any and all interactions between a potential or active customer and a company. • UI Design is responsible for the transference of a brand’s strengths and visual assets to a product’s interface as to best enhance the user’s experience. source: careerfoundry.com
- 5. UI/UX in the industry • 88% of online consumers are less likely to return to a site after a bad experience. – Econsultancy • 48% of people cited a website’s design as the number one factor in deciding the credibility of a business. – Ironpaper Inc. • A site with a well-designed user interface can have up to 200% higher conversion rates than one that was poorly designed. – Naturalinteraction • “Every dollar invested in UX generates around $100 dollars return” – IBM.
- 6. UI Defects
- 17. Challenges i18n dynamic content icons by Pixel perfect
- 18. A simple website… •10 pages •3 supported desktop browsers •2 mobile browsers •2 orientations •3 responsive breakpoints … 360 variations
- 19. Manual testing + Can better explore cases previously unthought of + Can be more flexible - Tedious and error prone - Unfeasible to take into account all possible scenarios - Tends to be executed only in specific development stages - Introduces delays in delivery and high costs
- 20. Automated testing + Can be easily integrated in CI/CD pipelines + Fast feedback loop + Reduces time, effort and costs required to fix issues + Confidence and safety nets for developers + Tests can be replicated and run at different development stages - Tests maintenance - Time required to run tests
- 21. Support for automated tests • Approach • Languages • Test frameworks and reporting • Tolerance and false positive detection • Coverage • Aid for code reviews • SaaS
- 22. Our approach • Targeting web apps and websites • Screenshot-based • Test Driven, outside-in • Python, pytest, needle • Selenium grid
- 23. Our approach GitLab runner GitLab job runner #1 … GitLab job runner #n GitLab server git repository CI/CD Selenium grid Selenium Hub Selenium Node Google Chrome dev Production web server nginx flask end user 1 2 3 4 5 uwsgi
- 24. Demo
- 25. Considerations, trade-offs and improvements • Test duration / feedback loop • Maintenance costs • Time needed to reach the testable state • False positive detection • Continuous testing/monitoring of production environments
- 26. Thanks