it( 'Should be able to subscribe', async(inject([Notifications], (ns: Notifications) => {
      permission = {deviceToken: 'device_token', permission: 'default'};
      windowStub._window.safari.pushNotification.requestPermission = (var1, var2, var3, var4) => {
        var4({deviceToken: 'device_token', permission: 'granted'});
      };