Thanks, your blog post was very helpful. I've got autotest working in my plugin. One hurdle I had to jump was that the new autotest defines an exception for vendor/plugins by default. So you can sit and define mappings all day and never get any results because the whole plugins directory is not being scanned. Once I added a RemoveException('vendor/plugin') to the top of my .autotest I was able to see my mappings work and moved on with fine tuning them.
Lee