diff --git a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
index dff3d53..a970bf6 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
@@ -167,7 +167,9 @@ protected function setUp() {
   }
 
   protected function tearDown() {
-    $this->kernel->shutdown();
+    if ($this->kernel instanceof DrupalKernel) {
+      $this->kernel->shutdown();
+    }
     parent::tearDown();
   }
 
diff --git a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
index dcc4953..8c8a2a5 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
@@ -165,6 +165,13 @@
   public $dieOnFail = FALSE;
 
   /**
+   * The DurpalKernel used in the test.
+   *
+   * @var \Drupal\Core\DrupalKernel
+   */
+  protected $kernel;
+
+  /**
    * The dependency injection container used in the test.
    *
    * @var \Symfony\Component\DependencyInjection\ContainerInterface
diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
index d75db82..13efa72 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
@@ -53,6 +53,9 @@ function testSimpleAjaxFormValue() {
     }
 
     // Verify that AJAX elements with invalid callbacks return error code 500.
+    // Ensure the test error log is empty before these tests.
+    $log_file = DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log';
+    $this->assertFalse(file_exists($log_file) && file_get_contents($log_file), 'error.log is empty.');
     foreach (array('null', 'empty', 'nonexistent') as $key) {
       $element_name = 'select_' . $key . '_callback';
       $edit = array(
@@ -61,5 +64,8 @@ function testSimpleAjaxFormValue() {
       $commands = $this->drupalPostAjaxForm('ajax_forms_test_get_form', $edit, $element_name);
       $this->assertResponse(500);
     }
+    // Delete the test error log to prevent these expected exceptions from being
+    // interpreted as a test failure.
+    file_put_contents($log_file, '');
   }
 }
diff --git a/core/modules/system/lib/Drupal/system/Tests/DrupalKernel/DrupalKernelTest.php b/core/modules/system/lib/Drupal/system/Tests/DrupalKernel/DrupalKernelTest.php
index 2639f3b..7d63e2b 100644
--- a/core/modules/system/lib/Drupal/system/Tests/DrupalKernel/DrupalKernelTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/DrupalKernel/DrupalKernelTest.php
@@ -10,12 +10,12 @@
 use Drupal\Core\DrupalKernel;
 use Drupal\Component\PhpStorage\MTimeProtectedFastFileStorage;
 use Drupal\Component\PhpStorage\FileReadOnlyStorage;
-use Drupal\simpletest\UnitTestBase;
+use Drupal\simpletest\DrupalUnitTestBase;
 
 /**
  * Tests compilation of the DIC.
  */
-class DrupalKernelTest extends UnitTestBase {
+class DrupalKernelTest extends DrupalUnitTestBase {
 
   public static function getInfo() {
     return array(
@@ -26,16 +26,9 @@ public static function getInfo() {
   }
 
   function setUp() {
-    parent::setUp();
-    global $conf;
-    $conf['php_storage']['service_container']= array(
-      'bin' => 'service_container',
-      'class' => 'Drupal\Component\PhpStorage\MTimeProtectedFileStorage',
-      'directory' => DRUPAL_ROOT . '/' . $this->public_files_directory . '/php',
-      'secret' => drupal_get_hash_salt(),
-    );
-    // Use a non-persistent cache to avoid queries to non-existing tables.
-    $this->settingsSet('cache', array('default' => 'cache.backend.memory'));
+    // Only create configuration directories, but skip unit testing DrupalKernel
+    // and everything else in DrupalUnitTestBase::setUp().
+    $this->prepareConfigDirectories();
   }
 
   /**
diff --git a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayFeedTest.php b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayFeedTest.php
index 408b243..f83a875 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayFeedTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayFeedTest.php
@@ -19,7 +19,7 @@ class DisplayFeedTest extends PluginTestBase {
    *
    * @var array
    */
-  public static $testViews = array('test_feed_display');
+  public static $testViews = array('test_display_feed');
 
   /**
    * Modules to enable.
@@ -52,7 +52,7 @@ public function testFeedUI() {
     $this->drupalGet('admin/structure/views');
 
     // Check the attach TO interface.
-    $this->drupalGet('admin/structure/views/nojs/display/test_feed_display/feed_1/displays');
+    $this->drupalGet('admin/structure/views/nojs/display/test_display_feed/feed_1/displays');
 
     // Load all the options of the checkbox.
     $result = $this->xpath('//div[@id="edit-displays"]/div');
@@ -68,13 +68,13 @@ public function testFeedUI() {
     $this->assertEqual($options, array('default', 'page'), 'Make sure all displays appears as expected.');
 
     // Post and save this and check the output.
-    $this->drupalPostForm('admin/structure/views/nojs/display/test_feed_display/feed_1/displays', array('displays[page]' => 'page'), t('Apply'));
-    $this->drupalGet('admin/structure/views/view/test_feed_display/edit/feed_1');
+    $this->drupalPostForm('admin/structure/views/nojs/display/test_display_feed/feed_1/displays', array('displays[page]' => 'page'), t('Apply'));
+    $this->drupalGet('admin/structure/views/view/test_display_feed/edit/feed_1');
     $this->assertFieldByXpath('//*[@id="views-feed-1-displays"]', 'Page');
 
     // Add the default display, so there should now be multiple displays.
-    $this->drupalPostForm('admin/structure/views/nojs/display/test_feed_display/feed_1/displays', array('displays[default]' => 'default'), t('Apply'));
-    $this->drupalGet('admin/structure/views/view/test_feed_display/edit/feed_1');
+    $this->drupalPostForm('admin/structure/views/nojs/display/test_display_feed/feed_1/displays', array('displays[default]' => 'default'), t('Apply'));
+    $this->drupalGet('admin/structure/views/view/test_display_feed/edit/feed_1');
     $this->assertFieldByXpath('//*[@id="views-feed-1-displays"]', 'Multiple displays');
   }
 
@@ -92,14 +92,14 @@ public function testFeedOutput() {
     $result = $this->xpath('//title');
     $this->assertEqual($result[0], $site_name, 'The site title is used for the feed title.');
 
-    $view = $this->container->get('entity.manager')->getStorageController('view')->load('test_feed_display');
+    $view = $this->container->get('entity.manager')->getStorageController('view')->load('test_display_feed');
     $display = &$view->getDisplay('feed_1');
     $display['display_options']['sitename_title'] = 0;
     $view->save();
 
     $this->drupalGet('test-feed-display.xml');
     $result = $this->xpath('//title');
-    $this->assertEqual($result[0], 'test_feed_display', 'The display title is used for the feed title.');
+    $this->assertEqual($result[0], 'test_display_feed', 'The display title is used for the feed title.');
   }
 
 }
diff --git a/core/modules/views/tests/modules/views_test_config/test_views/views.view.test_feed_display.yml b/core/modules/views/tests/modules/views_test_config/test_views/views.view.test_display_feed.yml
similarity index 89%
rename from core/modules/views/tests/modules/views_test_config/test_views/views.view.test_feed_display.yml
rename to core/modules/views/tests/modules/views_test_config/test_views/views.view.test_display_feed.yml
index 1c82fa3..d4ece5d 100644
--- a/core/modules/views/tests/modules/views_test_config/test_views/views.view.test_feed_display.yml
+++ b/core/modules/views/tests/modules/views_test_config/test_views/views.view.test_display_feed.yml
@@ -1,7 +1,7 @@
 base_table: node
-core: 8.0-dev
+core: 8
 description: ''
-status: '1'
+status: true
 display:
   default:
     display_options:
@@ -44,7 +44,7 @@ display:
           provider: views
       pager:
         options:
-          items_per_page: '10'
+          items_per_page: 10
         type: full
       query:
         type: views_query
@@ -64,11 +64,11 @@ display:
           provider: views
       style:
         type: default
-      title: test_feed_display
+      title: test_display_feed
     display_plugin: default
     display_title: Master
     id: default
-    position: '0'
+    position: 0
   feed_1:
     display_options:
       displays: {  }
@@ -79,19 +79,19 @@ display:
         type: node_rss
       style:
         type: rss
-      sitename_title: '1'
+      sitename_title: true
     display_plugin: feed
     display_title: Feed
     id: feed_1
-    position: '0'
+    position: 0
   page:
     display_options:
       path: test-feed-display
     display_plugin: page
     display_title: Page
     id: page
-    position: '0'
-label: test_feed_display
+    position: 0
+label: test_display_feed
 module: views
-id: test_feed_display
+id: test_display_feed
 tag: default
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/ViewListController.php b/core/modules/views_ui/lib/Drupal/views_ui/ViewListController.php
index b45efe7..960dbc0 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/ViewListController.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/ViewListController.php
@@ -258,6 +258,10 @@ protected function getDisplayPaths(EntityInterface $view) {
     $executable = $view->getExecutable();
     $executable->initDisplay();
     foreach ($executable->displayHandlers as $display) {
+      // DisplayBag may return NULL if a plugin was not found.
+      if (!isset($display)) {
+        continue;
+      }
       if ($display->hasPath()) {
         $path = $display->getPath();
         if ($view->status() && strpos($path, '%') === FALSE) {