Yes, but Testing isn't a full rolling release AFAIK. It undergoes a lengthy freeze before a new Stable is released and I believe manual intervention is needed to continue staying on Testing. Plus security patches take a bit of time to land on Testing from Sid, so the Debian guys don't recommend Testing if you need the fastest access to security updates.
> Yes, but Testing isn't a full rolling release AFAIK. It undergoes a lengthy freeze before a new Stable is released
Not more than unstable really. The only difference, testing is more polished overall. Other than that, they are both semi-rolling. Debian tried to reduce freeze period for a while already, and the last one was shorter than one before that.
> and I believe manual intervention is needed to continue staying on Testing.