It's not really focused on unit testing (though it does cover it) so much as it's focused on good design, but the two are related, so I found Avdi's "Objects on

It's not really focused on unit testing (though it does cover it) so much as it's focused on good design, but the two are related, so I found Avdi's "Objects on Rails" [1] helpful. [1]: http://objectsonrails.com/ http://objectsonrails.com/ I'm not sure if it's the best resource, though. I'd love to hear other opinions.