test-kitchen/kitchen-vagrant — pull request #104 by RobertRehberg (2014-07-02 18:43:51+00:00)
Title: Add support for generating vm.communicator so winrm can be specified.

You can not use winrm support provided by vagrant 1.6 without specifying the communicator.

https://www.vagrantup.com/blog/feature-preview-vagrant-1-6-windows.html