The following commit changed the behaviour of the Puppet module tool generator:
Prior to that commit any file that ended in .erb was processed as a template. After that commit any file that started with a period was no longer processed.
The reason why this is relevant is that the Puppet Module Skeleton project has a file .fixtures.yml.erb (https://github.com/garethr/puppet-module-skeleton/blob/master/skeleton/.fixtures.yml.erb) which is no longer correctly processed. puppetslabs_spec_helper does not allow the filename to be overridden.
I can't find any tests for the generate command so this is unspecified as far as I can tell.