add dnfmodule repo implementation

manifests/repo/dnfmodule.pp

@@ -0,0 +1,24 @@
+# @summary Manage the DNF module
+#
+# On EL8+ DNF can manage modules.
+# This is a method of providing multiple versions on the same OS.
+# Only one DNF module stream can be active at the same time.
+#
+# @param ensure
+#   Value of ensure parameter for nodejs dnf module package
+#
+# @param module
+#   Name of the nodejs dnf package
+#
+# @api private
+class nodejs::repo::dnfmodule (
+  String[1] $ensure = $nodejs::repo_version,
+  String[1] $module = 'nodejs',
+) {
+  package { 'nodejs dnf module':
+    ensure      => $ensure,
+    name        => $module,
+    enable_only => true,
+    provider    => 'dnfmodule',
+  }
+}

spec/acceptance/class_spec.rb

@@ -65,6 +65,42 @@ class { 'nodejs':
     end
   end
 
+  context 'RedHat with repo_class => nodejs::repo::dnfmodule', if: fact('os.family') == 'RedHat' && %w[8 9].include?(fact('os.release.major')) do
+    include_examples 'cleanup'
+
+    # Node 20 is only available in Stream yet, not in a released EL
+    # So we're testing 18 here
+    it_behaves_like 'an idempotent resource' do
+      let(:manifest) do
+        <<-PUPPET
+        class { 'nodejs':
+          nodejs_dev_package_ensure => installed,
+          npm_package_ensure        => installed,
+          repo_class                => 'nodejs::repo::dnfmodule',
+          repo_version              => '18',
+        }
+        PUPPET
+      end
+    end
+
+    %w[
+      npm
+      nodejs
+      nodejs-devel
+    ].each do |pkg|
+      describe package(pkg) do
+        it do
+          is_expected.to be_installed
+        end
+
+        it 'comes from the expected source' do
+          pkg_output = shell(pkg_cmd)
+          expect(pkg_output.stdout).to match 'appstream'
+        end
+      end
+    end
+  end
+
   context 'Debian distribution packages', if: fact('os.family') == 'Debian' do
     before(:context) { purge_node }