Hi Chad,

have a look at the Teachable package (VisualWorks and Squeak) 
which is explained and linked from:

http://astares.blogspot.com/2005/04/teaching-behavior.html

It's not a direct example for mock objects - merely a package
for dynamically creating and teaching an object how to react 
to messages.

You can use it to easily construct mock objects without
creating explicit mock classes. 
But take care: sometimes an explicit mock class is better
since you can use the tools on it (browser, lint, coverage, ...)

Bye
Torsten


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