How can I automate phantomjs and casperjs tests in Karma

I am trying to find a way to automate tests written in phantomjs &&/|| Casperjs with karma. Apparently you can run tests in phantomjs, but you cannot use phantomjs or casper as a framework/plugin like Jasmine. I know phantomjs in not a framework, but you can write tests with it. It is a bit confusing.

What I want to achieve is basically what you can do in Rails when you run Rspec. Is it possible? Am I using the wrong tools ?

Thanks!