README should have a section on troubleshooting core modules.

[16c7x]

I've watched a couple of people start using Onceover and every time they get stuck on missing resource types for things like ssh_authorized_keys because they don't have the core modules listed in their Puppetfile.
There should be a section in the README to quickly troubleshoot this.

[neomilium]

Feel free to provide a patch or to describe here the content you expect to have in README and I will add it.

[croddy]

I'm not sure the Puppetfile is the right place for these. For a given Puppet agent or server version, I want to test with whichever versions of the core modules are distributed with it, not with a customized selection of them that I have to maintain in the Puppetfile.

What I really need here, I think, is a way to add the right core modules on top of what's in the Puppetfile without listing them there.