Testing a service that returns an AsyncToken

Question

I have a working test that tests a service that returns an AsyncToken. I am using AsyncResponder instead of any of the Aysnc Flexunit stuff. Is this OK?
One thing I don't get is that the passthroughData get passed to the onResult method, even though AsyncResponder doesn't pass on anything other than the event.
    [Test(async)]
        public function testAttemptLogin():void
      var token: AsyncToken = objectToTest.attemptLogin('k');
     token.addResponder(new AsyncResponder(onResult, faultHandler));
        private function onResult(event:ResultEvent,passthroughData:Object):void {
//assertions

Answer 1

No. This will not work.
FlexUnit has a Async.asyncResponder
method that will do what you want
Mike