in reply to How do I localize a value to the calling function's scope?

I think you're approaching the problem from the wrong angle. If you want to test each function in isolation (which is a good thing), have each function appear in isolation. For example, if you have your functions in a library that uses Exporter, provide a way to export each function by itself. If you have an object method, create an class (on-the-fly, perhaps) that inherits from the object you want to test and that overrides every other method, leaving you just the one method to test.

Either way you go about it, you now have the ability to create the appropriate stubs, either in the namespace you export into or in the class that inherits from the class you're testing.

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