2/26/2023 0 Comments Imagemagick screenshot![]() (approvedImage, Metric.PeakAbsoluteError, delta) ĭelta.Write( string.Format( ". Var approvedImage = new MagickImage(ApprovedImagePath(name)) Var activeImage = new MagickImage(CaptureImagePath(name)) Private CompareResult CompareImage( string name) ![]() ActiveURL - the URL of the page that is being tested.ApprovedURL - the URL of the page that is approved.We have a simple " Page" class that contains the following properties to make it easier to deal with the data:.Read the ApprovedPages.txt file for the list of pages we should be Screenshot Smoke Testing.VerificationErrors = new StringBuilder() String.Format( " ConfigurationManager.AppSettings)) Selenium = new DefaultSelenium( " localhost", 4444, " *chrome", Start the Selenium server so we can run our selenium based testsĪctiveShots = ConfigurationManager.AppSettings ĪpprovedShots = ConfigurationManager.AppSettings ĮrroredShots = ConfigurationManager.AppSettings ĭeltaShots = ConfigurationManager.AppSettings īaseDomain = string.Format( " ConfigurationManager.AppSettings) ĬompareDomain = string.Format( " ConfigurationManager.AppSettings).Calls the PopulateUrls() method which we will go into detail next.what directories it should read and write to for the screenshots.Set some properties that will be used during the test so it knows: NET API to the ImageMagick image-processing library for Desktop and Web. Selenium packages (4) - Allows for Selenium server to get started up and leverage it during our unit tests.NUnit - NUnit is a unit-testing framework for all. ![]() Note that there are a few NuGet packages for the project: The VisualSmoke solution is for demonstration purposes of this approach and consists of a standard ASP.NET MVC Razor 2 project called VisualSmoke.Web which is the web application our test project will hit. over at CodePlex is a nice wrapper that makes it a bit easier to use ImageMagick within a. Here, you can see the use of the PAE metric - which is the Peak Average Error and seemed to work well. I saw this post that gave me the idea to do this: Stack Overflow Post. There might be some light pixel shifting for whatever reason that would be acceptable but we can adjust the compare to fail when the difference is at a certain level. If we were to take a screenshot of the page when it is in the state that we like and use that to compare against the newly built page, we could then leverage ImageMagick's compare functionality to tell us if something is wrong. ImageMagick has a lot of capabilities but the key one we will be focusing on is its compare capabilities. This got me to thinking that it would be nice to just have the test visually compare the newly checked-in page with the page prior to the check-in and make sure everything was working. The more checks you have in your test, the more confidence you can have in your spoke test that everything is in place. Some simple things such as making sure the page loads and a few items exist on the page. I started to write some basic selenium tests to make sure a checkin doesn't break something else within the solution. ![]() You can use a Firefox plugin to record your steps into a script and then export that script into junit (Java), rspec (ruby) or nunit (C#) unit tests. If you are not familiar with Selenium, it is basically used for web automation either on its own or within scripts. We are leveraging Selenium 2 for web page functional testing. ![]()
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