add type for selection of firewall

spec/type_aliases/firewall.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'K8s::Firewall' do
+  describe 'valid firewall' do
+    %w[
+      iptables
+      firewalld
+    ].each do |value|
+      describe value.inspect do
+        it { is_expected.to allow_value(value) }
+      end
+    end
+  end
+
+  describe 'invalid firewall' do
+    [
+      nil,
+      [nil],
+      [nil, nil],
+      { 'foo' => 'bar' },
+      {},
+      '',
+      's',
+      'mailto:',
+      'blah',
+      '199',
+      600,
+      1_000,
+    ].each do |value|
+      describe value.inspect do
+        it { is_expected.not_to allow_value(value) }
+      end
+    end
+  end
+end

types/firewall.pp

@@ -0,0 +1,5 @@
+# @summary a type to describe the type of the firewall to use
+type K8s::Firewall = Enum[
+  'iptables',
+  'firewalld',
+]