When you've got a small, static, single-page website, you'd think that you would spot anything wrong with the layout or the design fairly easily. Maybe a two-page microsite would still be OK. Add in a couple of hover states and that's probably fine, too. Keep adding things, keep building and, before you know it, you've got a multi-page site with a shiny responsive design, subtle hover states and a great vertical rhythm. It's perfect. Still sure you can't spot anything wrong? On any page? As the websites we develop get larger and more complex, we need to rely more and more on testing. Automated testing is exactly what you'd guess from the name. Rather than the developer or QA checking a list of pre-defined actions on the website to make sure everything works as expected, you have an automated system run the tests instead.
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