Creating async tests with jasmine is quite intuitive.
If you've read the documentation, then you are aware of the [waitsFor][2] and [runs][2] helpers in Jasmine.
I had more than one async action in my test, so it required an inspection on my side to verify that Jasmine would run the test in the same way I had expected.
If you specify a series of waitsFor or waits and runs callbacks, then Jasmine will start the countdown for each waitsFor at the appropriate time (in this gist - after the previous runs callback was completed).