/usr/share/puppet/modules.available/puppetlabs-mongodb/Rakefile is in puppet-module-puppetlabs-mongodb 0.7.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | require 'puppetlabs_spec_helper/rake_tasks'
require 'rspec-system/rake_task'
|