Flex, Flexunit: How to check that an event is sent twice?

Question

I am testing event dispatch code in a Flex application using the FlexUnit method addAsyncto verify event dispatch. So far, I can guarantee that at least one event has been fired. However, I want to be a little more detailed; I want to make sure that those events that I expect are sent. Is there a useful test pattern (or even a different test framework - I'm flexible!) To accomplish this?

I tried this code, but it does not appear a second time:

protected function expectResultPropertyChange(event: Event, numberOfEvents: int = 1): void {
    trace("Got event " + event + " on " + event.target + " with " + numberOfEvents + " traces left...");
    assertTrue(event.type == ResponseChangedEvent.RESPONSE_CHANGED);
    if (numberOfEvents > 1) {
        event.target.addEventListener(ResponseChangedEvent.RESPONSE_CHANGED, addAsync(expectResultPropertyChange, 1000, numberOfEvents - 1));
    }
}

public function testSomething(): void {
    requiredQuestion.addEventListener(ResponseChangedEvent.RESPONSE_CHANGED, addAsync(expectResultPropertyChange, 1000, 2));
    requiredQuestion.responseSelected("1", true);
    requiredQuestion.responseSelected("2", true);
}

Answer 1

In response to the comment ...

, ? responseSelected , RESPONSE_CHANGED . , , . , , , .

.. mock addAsync. - :

public function testSomething(): void 
{
    var requiredQuestion : RequiredQuestion = new RequiredQuestion();

    var callCount : int = 0;
    requiredQuestion.addEventListener(ResponseChangedEvent.RESPONSE_CHANGED, function(event : ResponseChangedEvent)
    {
        callCount++;
    });

    requiredQuestion.responseSelected("1", true);
    requiredQuestion.responseSelected("2", true);

    assertEquals(2, callCount);
}

Answer 2

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public class RequiredQuestion extends EventDispatcher
{
    private var someAsynchronousObject : IAsynchronousObject;

    public function RequiredQuestion(someAsynchronousObject : IAsynchronousObject = null)
    {
        someAsynchronousObject = someAsynchronousObject || new AsynchronousObject();
        someAsynchronousObject.addEventListener(Event.COMPLETE, asyncCallComplete);
    }

    public function responseSelected(id : String, flag : Boolean) : void
    {
        //Will asynchronously fire the Event.COMPLETE event
        someAsynchronousObject.startAsynchrounsCall(); 
    }

    protected function asyncCallComplete(event : Event) : void
    {
        dispatchEvent(new ResponseChangedEvent(ResponseChangedEvent.RESPONSE_CHANGED));
    }
}

, , , someAsynchronousObjec . AsycnhronousObject, , , . -, IAsynchronousObject, . ASMock, :

public function testSomething(): void 
{
    var mockIAsycnhronousObject :  IAsynchronousObject =
        IAsynchronousObject(mockRepository.createStrict( IAsynchronousObject));

    SetupResult.forEventDispatcher(mockIAsycnhronousObject);
    SetupResult.forCall(mockIAsycnhronousObject.startAsynchronousCall())
        .dispatchEvent(new Event(Event.COMPLETE)); // all calls to the startAsynchronousCall method and dispatch the complete event everytime it called.

    mockRepository.replayAll();

    var requiredQuestion : RequiredQuestion = new RequiredQuestion(mockIAsycnhronousObject);

    var callCount : int = 0;
    requiredQuestion.addEventListener(ResponseChangedEvent.RESPONSE_CHANGED, function(event : ResponseChangedEvent)
    {
        callCount++;
    });

    requiredQuestion.responseSelected("1", true);
    requiredQuestion.responseSelected("2", true);

    assertEquals(2, callCount);

    mockRepository.verifyAll();
}

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