How to Test in-app purchase without uploading app

Question

How can we test our in-app purchase code without first uploading it to the app store.

Answer 1

use CurrentAppSimulator class

Answer 2

Of course you use CurrentAppSimulator. We need more.  How can you tell if a feature works? For example, how can you verify that this code will work?  And what will the user experience be?

   await CurrentAppSimulator.RequestProductPurchaseAsync(feature, false);

Answer 3

Ah, WindowsStoreProxy.xml is the answer.  Somehow I glossed over this in instructions.

Also, I was kinda hoping there was a live "test app store" to bounce real messages off of.