diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/HtmlTwigAttributesTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/HtmlTwigAttributesTest.php
deleted file mode 100644
index fb26da6..0000000
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/HtmlTwigAttributesTest.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\system\Tests\Theme\HtmlTwigAttributesTest.
- */
-
-namespace Drupal\system\Tests\Theme;
-
-use Drupal\simpletest\WebTestBase;
-
-/**
- * Functional test for attributes of html.html.twig.
- */
-class HtmlTwigAttributesTest extends WebTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = array('theme_test');
-
-  public static function getInfo() {
-    return array(
-      'name' => 'html.html.twig html and body attributes',
-      'description' => 'Tests attributes inserted in the html and body elements of html.html.twig.',
-      'group' => 'Theme',
-    );
-  }
-
-  /**
-   * Tests that modules and themes can alter variables in html.html.twig.
-   */
-  function testThemeHtmlTwigAttributes() {
-    $this->drupalGet('');
-    $attributes = $this->xpath('/html[@theme_test_html_attribute="theme test html attribute value"]');
-    $this->assertTrue(count($attributes) == 1, 'Attribute set in the html element via hook_preprocess_HOOK() for html.html.twig found.');
-    $attributes = $this->xpath('/html/body[@theme_test_body_attribute="theme test body attribute value"]');
-    $this->assertTrue(count($attributes) == 1, 'Attribute set in the body element via hook_preprocess_HOOK() for html.html.twig found.');
-  }
-}