This Week in Open Source## appraisal
Test your Ruby gem against different versions of its dependencies.
Extend Sass with common mixins.
Test Javascript web apps with headless Webkit.
Scott Albertson
Authenticate users with email & password.
Configure vim, zsh, git, and tmux.
Dan Croak
Create Ruby test data.
Program in style.
Set up your OS X laptop for development.
Create a responsive grid with Sass and Bourbon.
Attach files to ActiveRecord objects.
Test common Rails functionality in one line