To run the tests, make sure you have installed gagarin globally:
$ npm install -g gagarin
Then run gagarin using the following command in the root of the app, which shows the verbose output:
$ gagarin --verbose
If you are running locally, you'll need to make sure you have Chromedriver running in the background. You can download that here:
http://chromedriver.storage.googleapis.com/index.html
And you may want to change the default timeout depending on the speed of your local computer:
$ gagarin -v -t 10000