diff --git a/core/modules/system/lib/Drupal/system/Tests/Serialization/EntitySerializationTest.php b/core/modules/system/lib/Drupal/system/Tests/Serialization/EntitySerializationTest.php
index 374115b..8696fea 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Serialization/EntitySerializationTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Serialization/EntitySerializationTest.php
@@ -130,17 +130,9 @@ public function testSerialize() {
     $actual = $serializer->serialize($normalized, 'ajax');
     $this->assertIdentical($actual, $expected, 'A normalized array serializes to JSON when "ajax" is requested');
     // Test 'xml'. The expected output should match that of Symfony's XmlEncoder.
-    $base_encoder = new BaseXmlEncoder();
-    $normalized = $serializer->normalize($this->entity, 'xml');
-    // We need to pass the normalized array structure to this.
-    $expected = $base_encoder->encode($normalized, 'xml');
-
-    // Test the expected XML response is correct.
-    $expected_test ='<?xml version="1.0"?>
+    $expected ='<?xml version="1.0"?>
 <response><id><value>1</value></id><revision_id><value>1</value></revision_id><uuid><value>' . $this->entity->uuid() . '</value></uuid><langcode><value>und</value></langcode><default_langcode><value/></default_langcode><name><value>' . $this->values['name'] . '</value></name><user_id><value>1</value></user_id><field_test_text><value>' . $this->values['field_test_text']['value'] . '</value><format>full_html</format></field_test_text></response>
 ';
-    $this->assertIdentical($expected, $expected_test, 'The expected XML response is correct.');
-
     $actual = $serializer->serialize($this->entity, 'xml');
     $this->assertIdentical($actual, $expected, 'Entity serializes to XML when "xml" is requested.');
     $actual = $serializer->serialize($normalized, 'xml');