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I cleanup up my semi-automagic test generator and xmp filter for Ruby, and added some code to make it win32-friendly*1.

If you missed it the first times I wrote about it: xmpfilter.rb is basically a source code filter than generate assertions for your tests, and annotate the code to show intermediate results. This picture illustrates the former:

The code on the right of the above picture was generated by

 xmpfilter.rb -u code.rb

This can save quite some typing when you're adding regression tests, or when you're developing the code and the tests in parallel. It can (and should) be used incrementally: you expand the assertions once and then keep editing the generated code (not the original one!), repeating this as many times as needed while you're writing the tests --- think of it as an intelligent kind of macro expansion. It should only take about 1 keypress under a sane editor (I show how to do it with vim below).

Intermediate result annotations