This week we're joined by Justin Searls, JavaScript developer and JS testing EXPERT. We talk lots about building and testing "fat" browser apps, particularly about best practices and different testing approaches. After a while Chris felt bad and told us to shut up.

Lots of topics are touched on in this episode including:

• TestDouble
• Backbone.js
• Michael Feathers book on working with legacy code
• Webassets for Python
• Pro JavaScript (John Resig)

You can listen to this latest episode either through the in-page player, by downloading the mp3 directly or subscribing to their feed.