Assert distribution support

This takes the approach that if a distribution is supported, it should
support certain versions that Foreman supports.

spec/puppet_version_spec.rb

@@ -2,6 +2,12 @@
 require 'semantic_puppet'
 
 SUPPORTED_PUPPET_VERSIONS = ['7.9.0', '8.0.0'].map { |v| SemanticPuppet::Version.parse(v) }
+SUPPORTED_DISTROS = {
+  'CentOS' => ['8', '9'],
+  'Debian' => ['11'],
+  'RedHat' => ['8', '9'],
+  'Ubuntu' => ['20.04'],
+}
 
 describe 'Puppet module' do
   Dir.glob(File.join(__dir__, '../_build/modules/*/metadata.json')).each do |filename|
@@ -14,12 +20,35 @@
         version_requirement ||= '>= 0'
         SemanticPuppet::VersionRange.parse(version_requirement)
       end
+      let(:operatingsystem_support) { metadata['operatingsystem_support'] }
 
       SUPPORTED_PUPPET_VERSIONS.each do |puppet_version|
         it "supports Puppet #{puppet_version}" do
           expect(puppet_requirement).to include(puppet_version)
         end
       end
+
+      SUPPORTED_DISTROS.each do |distro, versions|
+        versions.each do |version|
+          it "should support #{distro} #{version}" do
+            if operatingsystem_support.nil?
+              skip "No OS support listed"
+            end
+
+            distro_versions = operatingsystem_support.find { |os| os['operatingsystem'] == distro }
+
+            if distro_versions.nil?
+              skip "Distribution #{distro} is not supported"
+            end
+
+            unless distro_versions.key?('operatingsystemrelease')
+              skip "No specific distribution versions listed"
+            end
+
+            expect(distro_versions['operatingsystemrelease']).to include(version)
+          end
+        end
+      end
     end
   end
 end