I am working off of this tutorial: http://www.sitepoint.com/kickstart-your-angularjs-development-with-yeoman-grunt-and-bower/ as a means to understand what files are created usi
The github issue pointed out by @Jim Schubert has this comment:
The full list of karma dependencies that I needed to install to get tests working (coffeescript).
npm install --save-dev karma-chrome-launcher karma-firefox-launcher karma-safari-launcher karma-opera-launcher karma-ie-launcher karma-jasmine karma-coffee-preprocessor