happner-serial-mocha/spec/helpers/jasmine_examples/SpecHelper.js

Run mocha tests serially

beforeEach(function () {
  jasmine.addMatchers({
    toBePlaying: function () {
      return {
        compare: function (actual, expected) {
          var player = actual;

          return {
            pass: player.currentlyPlayingSong === expected && player.isPlaying
          }
        }
      };
    }
  });
});