FitNesse seems like a good tool to acceptance-test rules engines. Here are some useful links to get started..
some good links I have gone through in my journey!..
The one tool, that I believe, I will be getting a lot of return-on-investment in my coding career.
some helpful pointers for people getting started with the Ruby programming language..
Want to get started with Automated testing? Here is a quick overview on the topics to be familiar with.