Just a quick note here – we released ChefDK 0.5.1 which contains a fix for the `chef diff` command raising an `undefined_method` error. It also updates the embedded Chef from version 12.2.1 to 12.3.0.
This fixes the issue I highlighted in the 0.5.0 release blog post where OSX users should not use Chef 12.2.1 to converge their node. With 0.5.1, converge ahead!
ChefDK can be downloaded at https://downloads.chef.io/chef-dk.