The only thing that I know of that seems to describe what you are looking for is Silktest, but it's expensive and has a proprietary programming language (and, according to rumor, the company may go bankrupt). I'd love to see something like that allows one to easily construct a 'use case' and test against it.

Other than that, the only thing I can think of is to examine your code base, figure out your data sources and see if you can write a code generator for them. It can take quite a bit of work to create a good one, but the effort is worthwhile. I wrote a script to automatically generate form parsing code to deal with a large Web site that had a lot of very poorly done form handling. By creating standard error routines and running the generator against against my Web-based forms, I've been able to do a lot of conversion work quickly and easily. I realize that this is not exactly what you are looking for, as this primarily deals with capturing data and not processing, but it might be a start.

Cheers,
Ovid

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