(spec) add tests

spec/classes/core/fiberspec_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'profile::core::fiberspec' do
+  on_supported_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:facts) { os_facts }
+
+      it { is_expected.to compile.with_all_deps }
+
+      include_examples 'fiberspec'
+    end
+  end
+end