http://tinnedfruit.com/2011/03/03/testing-backbone-apps-with...
[0] http://johnbintz.github.com/jasmine-headless-webkit/
If headless is not what you want, js-test-driver[1] looks promising. It has adapters for jasmine too.
1. http://code.google.com/p/js-test-driver/
[0] http://johnbintz.github.com/jasmine-headless-webkit/