How can I set up my Ruby-on-Rails application to run one of the popular Javascript unit testing frameworks with Minitest?

I've managed to get Capybara set up with Minitest for Javascript-supported feature and integration tests. I'd also like to set up a Javascript unit testing framework.

It looks like the popular gems — Jasmine, Teaspoon, Konacha — all target RSpec. And Google hasn't turned up much literature on the subject.

Is there a gem that supports Javascript unit testing for Minitest? Or is there another simple way to integrate Javascript unit tests into my app's test suite?