testing is testing. it points to the version that is on testing, be it 7-wheezy, or 8-whatever.
the only exception to the rule is 'sid'. debian sid is always the bleeding edge, it never becomes a proper version.
btw, i hate every versioning alias scheme that does not force the number to appear. such as debian, ubuntu, android... it's all just idiotic.
Now consider trying to make similar determinations if you know you're running "Gingerbread" but the latest version is "Jelly Bean", or if you're on "Intrepid Ibex" and the latest version is "Raring Ringtail".
It's even worse on Ubuntu, where they've chosen a reasonable, useful numerical versioning system (year.month), but then obscure it with stupid codenames.
IMO it's also much more difficult to remember the codenames. I had to verify that Android 4.2 was still called Jelly Bean and though I knew the latest Ubuntu was 13.04, I had to look up its codename altogether.
The fact that these projects continue to have underlying "developer use only"-type numerical versions only further emphasizes the utility of these. The codenames feel like a poorly-conceived marketing thing. I don't think most people have trouble remembering a coupled software package with a version number, like "Windows 7". I don't think they often say, "Oh crap, I know I had version 4 of something ... was it Android or Windows?"
If they really wanted to improve UI, it would also be in the 'system settings' link under the username on the desktop panel- for users that run desktops.
"debian 7"
Now, this phone runs android Diabetes, and you want a feature introduced in android Cavity. Should I buy this one? I don't f#&$%#& know!