Puppet::Util::Windows is undefined on non-Windows platforms

The file lib/puppet/util/windows.rb defines a set of constants that should be available on all platforms, such as Puppet::Util::Windows, Puppet::Util::Windows::Service and Puppet::Util::Windows::Service::DEFAULT_TIMEOUT.

It also requires Windows-specific code that is only safe to load on Windows, because the code tries to load native libraries, such as user32.dll.

The problem is when puppet is running on a non-Windows platform, then lib/puppet/util/windows.rb is never loaded. As a result, trying to test a service resource using rspec-puppet fails when trying to reference the Puppet::Util::Windows constant. See PDK-1760 for steps to reproduce.

A quicker reproduction is:

$ bundle exec ruby -e "require 'puppet'; puts Puppet::Util::Windows"

Traceback (most recent call last):

-e:1:in `<main>': uninitialized constant Puppet::Util::Windows (NameError)