Add spec test to ensure correct behavior across PE versions

This spec test makes sure that the pg_repack class is included
on versions of PE that support it and is not included on versions
that do not support it.

spec/classes/maintenance_spec.rb

@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+describe 'pe_databases::maintenance' do
+  on_supported_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:pre_condition) { "class { 'pe_databases': }" }
+      let(:facts) { os_facts }
+
+      it { is_expected.to compile }
+
+      context "on PE 2019.0.0" do
+        before(:each) do
+          facts['pe_server_version'] = '2019.0.0'
+        end
+
+        it { should contain_class('pe_databases::maintenance::vacuum_full')}
+        it { should_not contain_class('pe_databases::maintenance::pg_repack')}
+      end
+      context "on PE 2018.1.4" do
+        before(:each) do
+          facts['pe_server_version'] = '2018.1.4'
+        end
+
+        it { should contain_class('pe_databases::maintenance::vacuum_full')}
+        it { should_not contain_class('pe_databases::maintenance::pg_repack')}
+      end
+      context "on PE 2018.1.8" do
+        before(:each) do
+          facts['pe_server_version'] = '2018.1.9'
+        end
+
+        it { should contain_class('pe_databases::maintenance::vacuum_full').with( { 'disable_maintenance' => true }) }
+        it { should contain_class('pe_databases::maintenance::pg_repack')}
+      end
+      context "on PE 2019.0.3" do
+        before(:each) do
+          facts['pe_server_version'] = '2019.0.3'
+        end
+
+        it { should contain_class('pe_databases::maintenance::vacuum_full').with( { 'disable_maintenance' => true }) }
+        it { should contain_class('pe_databases::maintenance::pg_repack')}
+      end
+    end
+  end
+end