angular2/core'

import {Injectable} from 'angular2/core';

@Injectable()
export class MyService {
  var snd;

  constructor() {
    this.snd = new Audio('Assets/sound.wav');
  }

  simpleFunction() {
    return true;
  }
}
    
import {describe, expect, it} from 'angular2/testing';
import {Component} from 'angular2/core';
import {MyService} from 'my.service';

export function main() {
  describe('My service', () => {
    var myService: MyService = new MyService();

    it('should work', () => {
      expect(myService.simpleFunction).toEqual(true);
    });

  });
}
    
ReferenceError: Can't find variable: Audio
    
if (Audio !== undefined)
    
import {describe, expect, it} from 'angular2/testing';
import {Component} from 'angular2/core';
import {MyService} from 'my.service';

export function main() {
  describe('My service', () => {

    beforeEach(() => {
        if (!window.Audio) {
            window.Audio = function() {
                return {
                    play: function() {},
                    pause: function() {},
                    // ... etc
                };
            };
        }
    });

    var myService: MyService = new MyService();

    it('should work', () => {
      expect(myService.simpleFunction).toEqual(true);
    });

  });
}