In order to test first run grunt browserify:test which will create the
test-suite.js file from all of the .js files located in test/front-end/unit.
After that open test.html in a browser and there should be two passing tests.
To run tests on the command line run grunt test, this will build the same
test-suite with browserify and run grunt-simple-mocha on that file.
There is also an autotest feature that will detect changes in the files specified in the watch:autoTest:files array and rerun both the browserify and test tasks automatically.