I'm currently working on a new Date class with some extra clock skew features. I want to fully test it so I can guarantee it is a drop in replacement for the existing Date class.
So coming from the Ruby world - we have a rubyspec project which is a test suite for all of the standard features, so that different interpreters can easily be compared.
I've been looking around for something similar in JavaScript. The only thing I've found so far is the JavaScript Test Library. I've ended up porting some of them across to Jasmine so that I can run them easily in multiple browsers.
Is there something better I can use? It seems like this type of thing would be really valuable.