I've started working on this, it'll probably take the syntax:
// do stuff
As far as output goes, I intend to have basic string diffing, but will see how it goes.
Hamcrest is ok, but needs a serious overhaul in my opinion, it's not as nice to use as it could be.
http://github.com/yuya-takeyama/esperance looks interesting, might leverage it
Espérance is cool.
Still not many assertions, yet.
I'm doing some research in https://github.com/paulodiovani/dspec-example-tests