Cairngorm IResponder Async Flexunit testcase

Didn't find any posts addressing FlexUnit async tests using IResponder.
Here is one method of using async flexunit tests with Cairngorm IResponder which involves modifying the flexunit source code.

TestCase.as
------------
public function addResponder(responder : IResponder, timeout : int, passThroughData : Object = null) : IResponder
{
if (asyncTestHelper == null)
{
asyncTestHelper = new AsyncTestHelper(this, testResult);
}
asyncMethods.push({func: responder.result, timeout: timeout, extraData: passThroughData, failFunc: responder.fault, responder: responder});
return asyncTestHelper;
}

AsyncTestHelper.as
---------------------
import mx.rpc.IResponder;
public class AsyncTestHelper implements IResponder
...

public function result(event : Object) : void
{
var wasReallyAsync : Boolean = timer.running;
timer.stop();
//if we already failed don't do anything
if (shouldFail)
return;
objToPass = event;
if (wasReallyAsync)
{
testResult.continueRun(testCase);
}
}

public function fault(event : Object) : void
{
var wasReallyAsync : Boolean = timer.running;
timer.stop();
//if we already failed don't do anything
if (shouldFail)
return;
objToPass = event;
if (wasReallyAsync)
{
shouldFail = true;
testResult.continueRun(testCase);
}
}

Then, in your test case function, use the result of
'this.addResponder(this, 5000)' when you need to pass an IResponder callback

eg.
myDelegate.runAsyncFunction(param, this.addResponder(this, 5000));
instead of
myDelegate.runAsyncFunction(param, this);