diff -u b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
--- b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
+++ b/lib/Drupal/pgn/Tests/XmlEncoderUnitTest.php
@@ -10024,11 +10024,11 @@
     $encoder = new XmlEncoder();
     $encoded = $encoder->encode($this->normalized, 'pgnxml', array('xml_root_node_name' => 'PGNGAMES'));
 
-    $expected = new DOMDocument;
+    $expected = new \DOMDocument;
     $expected->preserveWhiteSpace = FALSE;
     $expected->loadXML($this->pgnxml);
 
-    $actual = new DOMDocument;
+    $actual = new \DOMDocument;
     $actual->preserveWhiteSpace = FALSE;
     $actual->loadXML($encoded);