I just released winrm-fs v0.3.2 to address a regression in Test-Kitchen 1.6.0 that surfaces on a second windows converge and only if using an alternate data_bags, clients, roles or environments directory. If you encounter issues using test-kitchen 1.6.0 on windows and see CookbookNotFound errors raised on a second converge, you will likely be fixed by installing the latest winrm-fs gem:
chef gem install winrm-fs
Matt