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diff --git a/web/core/modules/rdf/src/Tests/GetNamespacesTest.php b/web/core/modules/rdf/src/Tests/GetNamespacesTest.php
new file mode 100644
index 000000000..ca46c5cd7
--- /dev/null
+++ b/web/core/modules/rdf/src/Tests/GetNamespacesTest.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\rdf\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Confirm that the serialization of RDF namespaces in present in the HTML
+ * markup.
+ *
+ * @group rdf
+ */
+class GetNamespacesTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['rdf', 'rdf_test_namespaces'];
+
+  /**
+   * Tests RDF namespaces.
+   */
+  public function testGetRdfNamespaces() {
+    // Fetches the front page and extracts RDFa 1.1 prefixes.
+    $this->drupalGet('');
+
+    $element = $this->xpath('//html[contains(@prefix, :prefix_binding)]', [
+      ':prefix_binding' => 'rdfs: http://www.w3.org/2000/01/rdf-schema#',
+    ]);
+    $this->assertTrue(!empty($element), 'A prefix declared once is displayed.');
+
+    $element = $this->xpath('//html[contains(@prefix, :prefix_binding)]', [
+      ':prefix_binding' => 'foaf: http://xmlns.com/foaf/0.1/',
+    ]);
+    $this->assertTrue(!empty($element), 'The same prefix declared in several implementations of hook_rdf_namespaces() is valid as long as all the namespaces are the same.');
+
+    $element = $this->xpath('//html[contains(@prefix, :prefix_binding)]', [
+      ':prefix_binding' => 'foaf1: http://xmlns.com/foaf/0.1/',
+    ]);
+    $this->assertTrue(!empty($element), 'Two prefixes can be assigned the same namespace.');
+
+    $element = $this->xpath('//html[contains(@prefix, :prefix_binding)]', [
+      ':prefix_binding' => 'dc: http://purl.org/dc/terms/',
+    ]);
+    $this->assertTrue(!empty($element), 'When a prefix has conflicting namespaces, the first declared one is used.');
+  }
+
+}