--- /dev/null
+<?php
+
+namespace Drupal\Tests\rdf\Functional;
+
+use Drupal\file\Tests\FileFieldTestBase;
+use Drupal\file\Entity\File;
+
+/**
+ * Tests the RDFa markup of filefields.
+ *
+ * @group rdf
+ */
+class FileFieldAttributesTest extends FileFieldTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['rdf', 'file'];
+
+ /**
+ * The name of the file field used in the test.
+ *
+ * @var string
+ */
+ protected $fieldName;
+
+ /**
+ * The file object used in the test.
+ *
+ * @var \Drupal\file\FileInterface
+ */
+ protected $file;
+
+ /**
+ * The node object used in the test.
+ *
+ * @var \Drupal\node\NodeInterface
+ */
+ protected $node;
+
+ protected function setUp() {
+ parent::setUp();
+ $node_storage = $this->container->get('entity.manager')->getStorage('node');
+ $this->fieldName = strtolower($this->randomMachineName());
+
+ $type_name = 'article';
+ $this->createFileField($this->fieldName, 'node', $type_name);
+
+ // Set the teaser display to show this field.
+ entity_get_display('node', 'article', 'teaser')
+ ->setComponent($this->fieldName, ['type' => 'file_default'])
+ ->save();
+
+ // Set the RDF mapping for the new field.
+ $mapping = rdf_get_mapping('node', 'article');
+ $mapping->setFieldMapping($this->fieldName, ['properties' => ['rdfs:seeAlso'], 'mapping_type' => 'rel'])->save();
+
+ $test_file = $this->getTestFile('text');
+
+ // Create a new node with the uploaded file.
+ $nid = $this->uploadNodeFile($test_file, $this->fieldName, $type_name);
+
+ $node_storage->resetCache([$nid]);
+ $this->node = $node_storage->load($nid);
+ $this->file = File::load($this->node->{$this->fieldName}->target_id);
+ }
+
+ /**
+ * Tests if file fields in teasers have correct resources.
+ *
+ * Ensure that file fields have the correct resource as the object in RDFa
+ * when displayed as a teaser.
+ */
+ public function testNodeTeaser() {
+ // Render the teaser.
+ $node_render_array = entity_view_multiple([$this->node], 'teaser');
+ $html = \Drupal::service('renderer')->renderRoot($node_render_array);
+
+ // Parses front page where the node is displayed in its teaser form.
+ $parser = new \EasyRdf_Parser_Rdfa();
+ $graph = new \EasyRdf_Graph();
+ $base_uri = \Drupal::url('<front>', [], ['absolute' => TRUE]);
+ $parser->parse($graph, $html, 'rdfa', $base_uri);
+
+ $node_uri = $this->node->url('canonical', ['absolute' => TRUE]);
+ $file_uri = file_create_url($this->file->getFileUri());
+
+ // Node relation to attached file.
+ $expected_value = [
+ 'type' => 'uri',
+ 'value' => $file_uri,
+ ];
+ $this->assertTrue($graph->hasProperty($node_uri, 'http://www.w3.org/2000/01/rdf-schema#seeAlso', $expected_value), 'Node to file relation found in RDF output (rdfs:seeAlso).');
+ $this->drupalGet('node');
+ }
+
+}