--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Kernel\Common;
+
+use Drupal\Core\Url;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Make sure that attaching feeds works correctly with various constructs.
+ *
+ * @group Common
+ */
+class AddFeedTest extends KernelTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['system'];
+
+ /**
+ * Tests attaching feeds with paths, URLs, and titles.
+ */
+ public function testBasicFeedAddNoTitle() {
+ $path = $this->randomMachineName(12);
+ $external_url = 'http://' . $this->randomMachineName(12) . '/' . $this->randomMachineName(12);
+ $fully_qualified_local_url = Url::fromUri('base:' . $this->randomMachineName(12), ['absolute' => TRUE])->toString();
+
+ $path_for_title = $this->randomMachineName(12);
+ $external_for_title = 'http://' . $this->randomMachineName(12) . '/' . $this->randomMachineName(12);
+ $fully_qualified_for_title = Url::fromUri('base:' . $this->randomMachineName(12), ['absolute' => TRUE])->toString();
+
+ $urls = [
+ 'path without title' => [
+ 'url' => Url::fromUri('base:' . $path, ['absolute' => TRUE])->toString(),
+ 'title' => '',
+ ],
+ 'external URL without title' => [
+ 'url' => $external_url,
+ 'title' => '',
+ ],
+ 'local URL without title' => [
+ 'url' => $fully_qualified_local_url,
+ 'title' => '',
+ ],
+ 'path with title' => [
+ 'url' => Url::fromUri('base:' . $path_for_title, ['absolute' => TRUE])->toString(),
+ 'title' => $this->randomMachineName(12),
+ ],
+ 'external URL with title' => [
+ 'url' => $external_for_title,
+ 'title' => $this->randomMachineName(12),
+ ],
+ 'local URL with title' => [
+ 'url' => $fully_qualified_for_title,
+ 'title' => $this->randomMachineName(12),
+ ],
+ ];
+
+ $build = [];
+ foreach ($urls as $feed_info) {
+ $build['#attached']['feed'][] = [$feed_info['url'], $feed_info['title']];
+ }
+
+ // Use the bare HTML page renderer to render our links.
+ $renderer = $this->container->get('bare_html_page_renderer');
+ $response = $renderer->renderBarePage($build, '', 'maintenance_page');
+ // Glean the content from the response object.
+ $this->setRawContent($response->getContent());
+ // Assert that the content contains the RSS links we specified.
+ foreach ($urls as $description => $feed_info) {
+ $this->assertPattern($this->urlToRSSLinkPattern($feed_info['url'], $feed_info['title']), format_string('Found correct feed header for %description', ['%description' => $description]));
+ }
+ }
+
+ /**
+ * Creates a pattern representing the RSS feed in the page.
+ */
+ public function urlToRSSLinkPattern($url, $title = '') {
+ // Escape any regular expression characters in the URL ('?' is the worst).
+ $url = preg_replace('/([+?.*])/', '[$0]', $url);
+ $generated_pattern = '%<link +href="' . $url . '" +rel="alternate" +title="' . $title . '" +type="application/rss.xml" */>%';
+ return $generated_pattern;
+ }
+
+ /**
+ * Checks that special characters are correctly escaped.
+ *
+ * @see https://www.drupal.org/node/1211668
+ */
+ public function testFeedIconEscaping() {
+ $variables = [
+ '#theme' => 'feed_icon',
+ '#url' => 'node',
+ '#title' => '<>&"\'',
+ ];
+ $text = \Drupal::service('renderer')->renderRoot($variables);
+ $this->assertEqual(trim(strip_tags($text)), 'Subscribe to <>&"'', 'feed_icon template escapes reserved HTML characters.');
+ }
+
+}