This image comparison tool is based on WebdriverIO, which makes for a lot of neat functionality. While PhantomCSS mainly targets headless browsers, there are quite a few solutions for automation screenshot comparison in real browsers. You can pixel-diff with Resemble.js directly in Node (e.g.The setup takes quite a lot of time and resources.Terrific documentation with best practices from Huddle.Due to this, there is little incentive to choose PhantomCSS for modern commercial projects. On the other hand, the overhead of setting it up is comparable to that of a real browser. Since the tool is not for a real browser that people use, your test results may differ from what the users actually see.
The drawback of PhantomCSS is it’s overhead-to-value ratio. Both PhantomCSS and Resemble.js are brainchildren of Huddle, and both of them have a solid developer support and top-notch documentation PhantomCSS is a screenshot comparison module that works in tandem with Resemble.js and offers a visual/CSS regression testing library for PhantomJS and SlimerJS. : the developers of this image comparison tool have ceased maintaining it due to the introduction of the headless Chrome. This is suboptimal for real-life visual UI testing. The image comparison functionality of this tool boils down to simple pixel matching (i.e.Resemble.js can ignore image regions during comparison.With bounding boxes, you can run comparison for separate parts (i.e.You can ignore colors, anti-aliasing, and transparency effects (i.e. Simple API for image comparison with JavaScript and HTML5 Canvas.This is not practical for comparing screenshots of web pages where content will often shift by just a few pixels resulting in image comparison fails. The tool uses a somewhat simplistic pixel matching algorithm that allows for tolerance of the number of different pixels. The module offers basic image comparison functionality and a clean syntax: In fact, it serves as a core of other screenshot comparison tools on this list. Aside from this, Resemble.js can function as part of any image analysis setup. Resemble.js is as an image comparison module that PhantomCSS uses to compare screenshots taken by CasperJS. Resemble.js (underlies other image comparison tools) In this post, we’ll find out if the functionality of these image comparison tools meets the real-life requirements of UI testing. Let’s look at the popular tools and platforms that QAs leverage to compare screenshots when testing web UIs. So do you automate image comparison when testing UIs? And if yes, what automation tool do you use? Is it a simple module for WebDriver (or other code-based solution) or a dedicated visual CSS regression testing tool? No sane QA engineer is willing to accept that risk. Absence of a screenshot comparison tool puts your product at risk of shipping with visual bugs which rarely go unnoticed by users.
There is a simple case for why end-to-end UI testing is impossible without automated image comparison.
Resemble.js (underlies other image comparison tools).
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