Simple Vagrant configuration for running the BBC's Wraith screenshot comparison tool - https://github.com/BBC-News/wraith
If you are not familiar with Vagrant check it out - http://www.vagrantup.com/
Bring up the Vagrant VM
vagrant up
Once Vagrant has initialised and the VM has booted up Wraith should be available in share/wraith. Edit the config.yaml to configure the URL's and screen sizes you want to screenshot.
SSH into the VM
vagrant ssh
Browse to the location of Wraith
cd /usr/local/apps/wraith
Execute rake to begin the test
rake