portertech/kitchen-docker — pull request #55 by madhatter (2014-04-24 13:44:05+00:00)
Title: Added necessary requirement to parse socket uri 

I noticed that I always got the rescue phrase "You must first install the Docker CLI tool http://www.docker.io/gettingstarted/" because parsing of the socket uri failed with
`socket_uri': uninitialized constant Kitchen::Driver::Docker::URI (NameError)

Adding `require 'uri'` did the trick for me.