One thing I have taken issue with a lot of these different CSS "component" implementations, is the lack of examples on how one would write a good testing suite

One thing I have taken issue with a lot of these different CSS "component" implementations, is the lack of examples on how one would write a good testing suite for these. My first reaction looking at these is not "wow", but more "how can I test this?" I would honestly be interested in hearing from some people here about how you would go about writing a proper test for these examples. And if the answer is "webdriver screenshotting", I might just shake my head a bit.