diff --git a/core/modules/block/src/Tests/BlockPreprocessUnitTest.php b/core/modules/block/src/Tests/BlockPreprocessUnitTest.php
deleted file mode 100644
index 5ae036a..0000000
--- a/core/modules/block/src/Tests/BlockPreprocessUnitTest.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\block\Tests\BlockPreprocessUnitTest.
- */
-
-namespace Drupal\block\Tests;
-
-use Drupal\simpletest\WebTestBase;
-
-/**
- * Tests the template_preprocess_block() function.
- *
- * @group block
- */
-class BlockPreprocessUnitTest extends WebTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = array('block');
-
-  /**
-   * Tests block classes with template_preprocess_block().
-   */
-  function testBlockClasses() {
-    // Define a block with a derivative to be preprocessed, which includes both
-    // an underscore (not transformed) and a hyphen (transformed to underscore),
-    // and generates possibilities for each level of derivative.
-    // @todo Clarify this comment.
-    /** @var \Drupal\block\BlockInterface $block */
-    $block = entity_create('block', array(
-      'plugin' => 'system_menu_block:admin',
-      'region' => 'footer',
-      'id' => \Drupal::config('system.theme')->get('default') . '.machinename',
-    ));
-
-    $variables = array();
-    $variables['elements']['#block'] = $block;
-    $plugin = $block->getPlugin();
-    $variables['elements']['#configuration'] = $plugin->getConfiguration();
-    $variables['elements']['#plugin_id'] = $plugin->getPluginId();
-    $variables['elements']['#base_plugin_id'] = $plugin->getBaseId();
-    $variables['elements']['#derivative_plugin_id'] = $plugin->getDerivativeId();
-    $variables['elements']['content'] = array();
-
-    // Test adding a class to the block content.
-    $variables['content_attributes']['class'][] = 'test-class';
-    template_preprocess_block($variables);
-    $this->assertEqual($variables['content_attributes']['class'], array('test-class'), 'Test-class class added to block content_attributes');
-  }
-
-}