jasmine-core/lib/jasmine-core/example/spec/SpecHelper.js

Simple JavaScript testing framework for browsers and node.js

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

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