Delegate class to access non-public methods during testing?

In the following video, towards the end, someone asked that FlexUnit assumes functions and methods are to be public when tested.
http://tv.adobe.com/watch/max-2008-develop/testing-your-flex-applications-by-michael-labri ola/
The speaker replied (@ 52:25), to use Delegate classes, which are linked in when being tested.
Can someone show me an example of this? Thanks.

Mike, thanks for the reply!
As I am new to unit testing, things are still solidifying. I do understand that Unit Testing, “tests the smallest functional unit of code”, which are methods and functions. However, I incorrectly assumed that *every* method needed to be tested *directly*. Hence, I thought all methods would have to be public. So that would have blown encapsulation out of the water. Now I understand from your reply, that private methods get tested indirectly from public methods. And that seems more ideal.
Thanks again.

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RGB

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Delegate class to access non-public methods during testing?

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