[andrewmccall]

What separates this from continuous integration. As I understand it the article proposes testing the same build over and over again, well the same commit rebuilt and retested over and over again. Where do you benefit from this?

I could see a situation where tests running against a live system would be worthwhile, this is what I though when I saw the title.

[dnesteruk]

Continuous integration happens on very commit. You have to physically commit your changes to source control, in which case your CI system picks it up.

Continuous testing happens on every save. You safe a file, it gets synced with another machine, the build happens there. If the build succeeds, tests run and you get immediate feedback on whether you broke anything.