That is quite common for R language, it is a scripting language that you are suppose to explore as you use. So if you want to test it, it's very simple ... Just

That is quite common for R language, it is a scripting language that you are suppose to explore as you use. So if you want to test it, it's very simple ... Just run the script until the part you are interested and then plot the hell out of it. It's widely known on the "theory of testing" that data oriented systems can't be tested without immense amount of effort. If you are interested there are plenty of academic talks about the subject.