Install node.js 0.12.2 npm install

Install Ruby 2+ (for concurrency tests)

gem install bundler
bundle

grunt
node cluster.js

Grunt clears public dir and resets lock counter in Redis.

curl http://localhost:3000/api/v1/articles/1
curl -X POST -d "html=new-html" -d "version=0" http://localhost:3000/api/v1/articles/1
celluloid-benchmark -d 20 -v 4

Celluloid-benchmark is a concurrent, stateful, scriptable load test tool. -d is duration in second -v is number of concurrent visitors. Test is in session.rb.

It should show ERR for the update under moderate concurrency. Some editors are going to try stale updates, and they'll get 409s returned.