Googles new Structured Data Testing Tool

Have you heard about a similar tool (also by Google) with an option to mark your text on the website and let Google do the hard work of inserting the tags on your website?

Does that sit on:
Google Webmaster Tools > Search Appearance > Data Highlighter?

I've been using it for a few months. It's quite easy...

Data highlighter is an easy way to add markup and has been out for quite a long time, but it's also a bit of a bodge imho, as only Google can read it. If you use a standard mark up like schema.org or any of the others, they can be read by all the Search Engines, as well as applications, future proofing your site.

Just my theory, but I suspect data highlighter was brought out to address the slow take up of webmasters marking up their sites, and to generate a lot more structured data very quickly. Now the different schemas are maturing, I suspect or wouldn't be surprised if the data highlighter gets dropped in the next 12 - 18 months.