There are few ways to run unit tests.

The first is running Karma test runner (from the root of the repo) via Karma CLI:

karma start test/karma.conf.js

The second is direct browser testing. At this case you need to get Babel preprocessor installed. Run:

babel test/src --watch --out-dir test/js

And open SpecRunner.html file using any browser.

The third way is using Grunt

grunt test

The same grunt task runs every time when you're making a build:

grunt