Is it possible to set up travis to run tests for several languages?

It is not possible yet to have several languages on travis configuration file.

On the other hand, all environments run node.js. The following script does the trick:

language: ruby
rvm:
  - 2.0.0
before_script:
  - npm install karma
script:
  - RAILS_ENV=test bundle exec rake --trace db:migrate test
  - karma start --single-run --browsers PhantomJS test/karma/config/unit.js

Help found on an old thread in a google group