Spot the difference - automating visual regression testing
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The document discusses the advantages and challenges of automating visual regression testing, emphasizing the benefits of reliability and speed over manual testing, which can be time-consuming and prone to human error. It highlights common issues with UI automation, the need for effective maintenance of tests, and ongoing challenges related to image comparison, browser compatibility, and dynamic content. The author explores various testing strategies and tools while noting that automated testing is not a one-size-fits-all solution.
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Spot the difference - automating visual regression testing
- 1. Spot the difference Automating visual regression testing @11vlr
- 2. @11vlr Spot the difference Automating visual regression testing
- 3. @11vlr • Previously a Software Engineer for 7 years (.Net C#) • Currently a Senior Test Engineer @Vizolution • Code Club volunteer • Organiser of SwanseaCon • Co-organiser of DDD Wales ABOUT ME
- 4. • Automated testing is more reliable, as it is performed by tools and/or scripts. • Automated testing is executed by software tools, so it is significantly faster than a manual approach. WHY AUTOMATE END TO END UI TESTS? @11vlr
- 5. @11vlr • Investment is required • Automated testing is a practical option when the test cases are run repeatedly over a long time period. • Automated testing entail human observation and cannot guarantee user-friendliness or positive customer experience. COMMON UI AUTOMATION ISSUES DOES NOT
- 6. IT CAN BE A SLIPPERY SLOPE @11vlr
- 7. ICE-CREAM CONE ANTI-PATTERN @11vlr Unit Service UI Manual & Exploratory Testing £ £££
- 8. HOUR GLASS ANTI-PATTERN @11vlr £ £££ £ £££ UI Unit Manual & Exploratory Testing
- 9. @11vlr WHEN YOU HAVE UNIT BUT NO INTEGRATION TESTS
- 12. @11vlr WHY NOT JUST STICK WITH MANUAL TESTING THEN? • Manual testing allows for human observation, which may be more useful if the goal is user-friendliness or improved customer experience. UI Service Unit Manual & Exploratory Testing
- 13. @11vlr • Can be time intensive • Is not accurate at all times due to human error, hence it is less reliable. • Is time-consuming, taking up human resources. • Is only practical when the test cases are run once or twice, and frequent repetition is not required. MANUAL TESTING
- 14. WE DON’T HAVE TIME TO AUTOMATE @11vlr
- 15. CATCH 22 @11vlr We don’t automate We don’t have time BECAUSE BECAUSE
- 17. @11vlr • Open source; anybody can see the code and help • Big community of support • Can operate on almost any OS • Multiple language support (Python, Ruby, .Net, PHP, Java, JavaScript) • Supports a range of browsers like Opera, Chrome, IE (6,7,8,9,10,11), Mozilla Firefox, Safari SELENIUM
- 18. IT’S NOT A SILVER BULLET @11vlr
- 19. @11vlr • Speed to execute tests • Render differently BROWSER COMPATIBILITY ISSUES
- 22. @11vlr HOW VALUABLE ARE THESE TESTS?
- 24. @11vlr ALL IS NOT WHAT IT SEEMS
- 26. @11vlr • Page object patterns MAKING TESTS LESS FLAKY http://martinfowler.com/bliki/PageObject.html
- 27. @11vlr • Qa-selectors MAKING TESTS LESS FLAKY
- 29. @11vlr HOW GOOD ARE YOU AT SPOT THE DIFFERENCE
- 30. @11vlr HOW MANY DIFFERENCES CAN YOU FIND?
- 31. @11vlr HOW MANY DIFFERENCES DID YOU FIND? @11vlr
- 32. THERE WERE 8 DIFFERENCES @11vlr
- 33. HOW DO YOU KNOW WHEN YOU’VE FOUND THEM ALL? @11vlr
- 34. CAN WE ADD MORE VALUE TO OUR TESTS? @11vlr UI Service Unit Manual & Exploratory Testing
- 35. WHAT IF WE COULD SIMPLY @11vlr equalsAssert
- 37. @11vlr • Didn’t work straight out of the box and/or contained lots of bloat • Steep learning curve • Small community so lack of support • Needed to work with our current automation framework • Costs ISSUES WITH OTHER OFFERINGS
- 38. @11vlr • Still in development • Facing many challenges which are because of the products we offer, the ways in which we have developed them and the way in which we test them ROLLING OUR OWN
- 39. @11vlr • Browser rendering issues RELIABILITY
- 43. @11vlr LETS ZOOM IN A LITTLE
- 44. @11vlr LETS ZOOM IN A LITTLE BIT MORE…
- 45. @11vlr GOT HIM!
- 46. @11vlr HOW QUICK WAS THE MACHINE?
- 48. @11vlr MAINTAINABILITY Old code New code using some helpers
- 49. @11vlr MAINTAINABILITY New code using Specflow New code using some helpers
- 50. @11vlr EASILY IDENTIFY THE DIFFERENCES
- 51. @11vlr ACCURACY
- 54. @11vlr MAINTAINING BASE IMAGES Keep a base image for each driver type
- 55. @11vlr SCREENSHOTS • Viewport (default - WebDriver W3C standard) • Full Screen (stitching) • Capture images of just elements
- 59. @11vlr HARDWARE ISSUES Setting a tolerance for the 256 different intensities
- 60. @11vlr STORAGE Database / Online storage – file sizes (many images)
- 63. @11vlr MOVING ELEMENTS • CSS animations • Videos
- 65. @11vlr PDF DYNAMIC CONTENT • A way to blanket content within documents
- 67. @11vlr MORE COMPARISON OPTIONS • Text only • Layout only
- 68. ANOTHER TOOL TO ADD TO YOUR BELT @11vlr