A lightweight tool for regression testing of Cascading Style Sheets.
One picture might say more than 1000 words:
Your web stack should be fully testable. CSS Critic closes the gap in front end testing and makes HTML & CSS testable - no more broken UI. For example, make it supervise changes to your project's responsive styleguide so you know things are looking good.
We believe that your UI will change often enough that a lightweight process on managing changes (near instant feedback, anyone?) is more important than a heavy-weight one which could offer tighter control. Also CSS Critic aims at bridging the gap between user experience (UX) people and (UI) developers. You probably won't find any easier way of sharing your UI tests than as the simple web page that CSS Critic basically is. And don't feel put down by the "CSS" bit, you may throw anything at it that can be converted into a simple image.
$ npm install csscritic
node_modules/csscritic/example/RegressionRunner.html for an example on how to take it from there.
CSS Critic checks your current layout constantly against a reference image you have provided in the past. If your layout breaks (or simply changes - CSS Critic can't tell) your tests fail.
RegressionRunner.html similar to the one under
example/ and put it with your code that is to be tested.
Register your page under test via:
csscriticaddurl: 'SOME_URL' // link to the test case HTML document// Optionally:desc: 'some text' // a description of the test casewidth: number // the viewport width in pixelheight: number // the viewport height in pixelhover: 'A.SELECTOR' // or ...active: 'A.SELECTOR' // or ...focus: 'A.SELECTOR' // or ...target: 'A.SELECTOR' // match elements receiving activation of corresponding pseudo-class;
Open the RegressionRunner.html in Firefox for the first time and save the resulting image as future reference.
Re-run the RegressionRunner.html and see your test passing. Congratulations.
What do I do if my test fails?
Have a look at the diff image and visually inspect what has changed.
If the change is an unwanted one fix your CSS,
If deliberate accept the change (generating a new reference image).
For tests install Node.js and run
RegressionRunner.htmlor in ones below.
Licensed under MIT. Maintained by @cburgmer. Copyright (c) 2012, 2013 ThoughtWorks, Inc.