Referenced from: /Users/thomasjaspers/Documents/apps/ImageMagick-7.0.5/bin/./magickĪ bit of googling revealed that this is a rather common problem that has been discussed quite in detail in the ImageMagick forum. After downloading the dedicated Mac OS binary from here and starting it (following the given instructions) the following error showed up:ĭyld: Library not loaded: /opt/X11/lib/libpng15.15.dylib Installing ImageMagick on Mac OS turned out to be a bit more complicated than initially expected. Preparation Work – Installing ImageMagick If another command line tool should be used the approach shown in this blog post can be hopefully easily adapted. Using ImageMagick for the image comparison is of course a bit arbitrary choice. Embedding this into a Selenium test should then be straightforward. The following figure depicts the used components and their interaction.įor the sake of simplicity we will skip the Selenium part in this example and concentrate on executing the image comparison and evaluating the results. This even enables us to define a threshold value for allowed deviations between a new screenshot from a test run and its reference. This can then be used as a result in the Robot Framework. Furthermore it calculates a percentage value for the differences it finds when comparing two images. ![]() It is free and available for all major operating systems. The tool used in this post to perform the image comparison is ImageMagick. This tool is then executed utilizing the Robot Framework OperatingSystem library. The basic idea is using an external tool for the image comparison. Therefore this blog post describes a different approach to implementing the image comparison using the Robot Framework. But as it is using a cloud-based service for the image comparison it might not be suitable for projects due to legal implications. With Robot-AppEyes there is a ready-made keyword library available that supports this. It is especially meaningful for relatively static web pages to check for broken image references and layout flaws that are hard to detect otherwise. ![]() The comparison of images (screenshots) is one aspect of acceptance-level testing for web applications.
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