The qunit plugin works great, but I've got so many tests (some of which are a little slow) that it takes 14 seconds to run all of them. I think this time could be cut in half if my tests could be run in parallel.
As an attempt, I tried creating two html files with my tests, but the qunit plugin ran them sequentially. There's already a feature request asking for this so it's probably not possible. But I'm hoping there's a PhantomJS expert out there that knows a way to do it by passing in PhantomJS arguments.
If this is not possible in qunit but it is possible in another testing framework/grunt plugin, I might be willing to switch to it over this. So I might consider, "use X framework instead" as an answer.