--- /dev/null
+<?php
+
+namespace Drupal\Tests\file\Functional;
+
+use Drupal\file\Entity\File;
+
+/**
+ * Ensure that files added to nodes appear correctly in RSS feeds.
+ *
+ * @group file
+ */
+class FileFieldRSSContentTest extends FileFieldTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['node', 'views'];
+
+ /**
+ * Tests RSS enclosure formatter display for RSS feeds.
+ */
+ public function testFileFieldRSSContent() {
+ $node_storage = $this->container->get('entity.manager')->getStorage('node');
+ $field_name = strtolower($this->randomMachineName());
+ $type_name = 'article';
+
+ $this->createFileField($field_name, 'node', $type_name);
+
+ // RSS display must be added manually.
+ $this->drupalGet("admin/structure/types/manage/$type_name/display");
+ $edit = [
+ "display_modes_custom[rss]" => '1',
+ ];
+ $this->drupalPostForm(NULL, $edit, t('Save'));
+
+ // Change the format to 'RSS enclosure'.
+ $this->drupalGet("admin/structure/types/manage/$type_name/display/rss");
+ $edit = [
+ "fields[$field_name][type]" => 'file_rss_enclosure',
+ "fields[$field_name][region]" => 'content',
+ ];
+ $this->drupalPostForm(NULL, $edit, t('Save'));
+
+ // Create a new node with a file field set. Promote to frontpage
+ // needs to be set so this node will appear in the RSS feed.
+ $node = $this->drupalCreateNode(['type' => $type_name, 'promote' => 1]);
+ $test_file = $this->getTestFile('text');
+
+ // Create a new node with the uploaded file.
+ $nid = $this->uploadNodeFile($test_file, $field_name, $node->id());
+
+ // Get the uploaded file from the node.
+ $node_storage->resetCache([$nid]);
+ $node = $node_storage->load($nid);
+ $node_file = File::load($node->{$field_name}->target_id);
+
+ // Check that the RSS enclosure appears in the RSS feed.
+ $this->drupalGet('rss.xml');
+ $uploaded_filename = str_replace('public://', '', $node_file->getFileUri());
+ $selector = sprintf(
+ 'enclosure[@url="%s"][@length="%s"][@type="%s"]',
+ file_create_url("public://$uploaded_filename", ['absolute' => TRUE]),
+ $node_file->getSize(),
+ $node_file->getMimeType()
+ );
+ $this->assertNotNull($this->getSession()->getDriver()->find('xpath', $selector), 'File field RSS enclosure is displayed when viewing the RSS feed.');
+ }
+
+}