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At some point I'd like to add support for using mocha within Jest as well.

Right now we use jasmine internally, so I was pretty focused on getting it running with that. However, it is (quite intentionally) built such that the 'jasmine' parts are pretty isolated similar to a plug-in; So it should be possible to build plug-ins for other frameworks like Mocha as well at some point.

Mock functions are a really powerful tool. They let you test asynchronous functions in an entirely synchronous way. Because of that, Jest doesn't need to provide special support for asynchronous testing

http://facebook.github.io/jest/docs/tutorial.html#content

That might work for simple cases but I'd be worried that switching all your asynchronous calls to synchronous has the potential to introduce bugs that your tests would then miss. Testing asynchronous functions is hard for lots of reasons, and only one of them is that you have to wait for it to finish.

In what way? Jasmine 2.0 introduced Mocha-style done() for async tests.

Oh, that's great :). That happened after I evaluated Jasmine the last time.