add acceptance test

spec/acceptance/journal_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require 'spec_helper_acceptance'
+
+describe 'systemd with remote/upload journal' do
+  context 'configure journal remote/upload' do
+    let(:manifest) do
+      <<~PUPPET
+        package { 'openssl':
+          ensure => 'installed',
+          before => Exec['generate-key'],
+        }
+        exec { 'generate-key':
+          path    => ['/bin','/sbin','/usr/bin','/usr/sbin'],
+          command => 'openssl req -x509 -sha256 -nodes -newkey rsa:1024  -keyout key.pem -out cert.pem -subj "/CN=localhost"',
+          cwd     => '/tmp',
+          creates => '/tmp/cert.pem',
+          before  => Class['systemd'],
+        }
+        class { 'systemd':
+          manage_journal_upload   => false,
+          manage_journal_remote   => true,
+          journal_upload_settings => {
+            'URL' => 'https://127.0.0.1',
+          },
+          journal_remote_settings => {
+            'ServerKeyFile'         => '/tmp/key.pem',
+            'ServerCertificateFile' => '/tmp/cert.pem',
+          },
+        }
+      PUPPET
+    end
+
+    it 'works idempotently with no errors' do
+      apply_manifest(manifest, catch_failures: true)
+      apply_manifest(manifest, catch_changes: true)
+    end
+  end
+end