I ran some of the tests for a few of Django's more popular API and CMS frameworks, instrumented with HTTPolice. I found a few minor bugs, but nothing interesting enough to report. Like, one of them responds to an OPTIONS request with 200 (OK) but forgets to list OPTIONS itself in the Allow header -- cosmetic stuff like that.
Yes, DRF was one of those. But I don't remember whether I ran the whole test suite or only some subset of it that I could (quickly) get to run at all :) My goal was to get a sense of what it would look like on a realistic project, not so much to test DRF itself.
I hope to try it on Eve [1] soon-ish.
[1] http://python-eve.org/