diff --git a/core/modules/block/tests/src/Unit/Plugin/DisplayVariant/BlockPageVariantTest.php b/core/modules/block/tests/src/Unit/Plugin/DisplayVariant/BlockPageVariantTest.php
index 147e64a..bf01f41 100644
--- a/core/modules/block/tests/src/Unit/Plugin/DisplayVariant/BlockPageVariantTest.php
+++ b/core/modules/block/tests/src/Unit/Plugin/DisplayVariant/BlockPageVariantTest.php
@@ -74,23 +74,27 @@ public function setUpDisplayVariant($configuration = array(), $definition = arra
   public function providerBuild() {
     $blocks_config = array(
       'block1' => array(
-        // region, is main content block, is messages block
-        'top', FALSE, FALSE,
+        // region, is main content block, is messages block, is title block
+        'top', FALSE, FALSE, FALSE,
       ),
       // Test multiple blocks in the same region.
       'block2' => array(
-        'bottom', FALSE, FALSE,
+        'bottom', FALSE, FALSE, FALSE,
       ),
       'block3' => array(
-        'bottom', FALSE, FALSE,
+        'bottom', FALSE, FALSE, FALSE,
       ),
       // Test a block implementing MainContentBlockPluginInterface.
       'block4' => array(
-        'center', TRUE, FALSE,
+        'center', TRUE, FALSE, FALSE,
       ),
       // Test a block implementing MessagesBlockPluginInterface.
       'block5' => array(
-        'center', FALSE, TRUE,
+        'center', FALSE, TRUE, FALSE,
+      ),
+      // Test a block implementing TitleBlockPluginInterface.
+      'block7' => array(
+        'center', FALSE, FALSE, TRUE,
       ),
     );
 
@@ -146,13 +150,19 @@ public function providerBuild() {
           'block3' => [],
           '#sorted' => TRUE,
         ],
-        // The messages are rendered via the fallback in case there is no block
-        // rendering the main content.
+        // The messages and title are rendered via the fallback in case there is
+        // no block rendering the main content.
         'content' => [
           'messages' => [
             '#weight' => -1000,
             '#type' => 'status_messages',
           ],
+          'page_title' => [
+            '#markup' => 'Hi llamas!',
+            '#prefix' => '<h1>',
+            '#suffix' => '</h1>',
+            '#weight' => -900,
+          ],
         ],
       ],
     ];
@@ -176,7 +186,7 @@ public function providerBuild() {
           'block3' => [],
           '#sorted' => TRUE,
         ],
-        // The main content & messages are rendered via the fallback in case
+        // The main content, messages and title are rendered via the fallback in case
         // there are no blocks rendering them.
         'content' => [
           'system_main' => ['#markup' => 'Hello kittens!'],
@@ -184,6 +194,12 @@ public function providerBuild() {
             '#weight' => -1000,
             '#type' => 'status_messages',
           ],
+          'page_title' => [
+            '#markup' => 'Hi cats!',
+            '#prefix' => '<h1>',
+            '#suffix' => '</h1>',
+            '#weight' => -900,
+          ],
         ],
       ],
     ];
@@ -205,6 +221,7 @@ public function testBuild(array $blocks_config, $visible_block_count, array $exp
     $block_plugin = $this->getMock('Drupal\Core\Block\BlockPluginInterface');
     $main_content_block_plugin = $this->getMock('Drupal\Core\Block\MainContentBlockPluginInterface');
     $messages_block_plugin = $this->getMock('Drupal\Core\Block\MessagesBlockPluginInterface');
+    $title_block_plugin = $this->getMock('Drupal\Core\Block\TitleBlockPluginInterface');
     foreach ($blocks_config as $block_id => $block_config) {
       $block = $this->getMock('Drupal\block\BlockInterface');
       $block->expects($this->any())
@@ -212,7 +229,7 @@ public function testBuild(array $blocks_config, $visible_block_count, array $exp
         ->willReturn([]);
       $block->expects($this->atLeastOnce())
         ->method('getPlugin')
-        ->willReturn($block_config[1] ? $main_content_block_plugin : ($block_config[2] ? $messages_block_plugin : $block_plugin));
+        ->willReturn($block_config[1] ? $main_content_block_plugin : ($block_config[2] ? $messages_block_plugin : ($block_config[3] ? $title_block_plugin : $block_plugin)));
       $blocks[$block_config[0]][$block_id] = $block;
     }
     $this->blockViewBuilder->expects($this->exactly($visible_block_count))
@@ -254,6 +271,12 @@ public function testBuildWithoutMainContent() {
           '#weight' => -1000,
           '#type' => 'status_messages',
         ],
+        'page_title' => [
+          '#markup' => '',
+          '#prefix' => '<h1>',
+          '#suffix' => '</h1>',
+          '#weight' => -900,
+        ],
       ],
     ];
     $this->assertSame($expected, $display_variant->build());
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php b/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
index a5d6d09..213b081 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
@@ -52,7 +52,7 @@
    *
    * @var string[]
    */
-  protected $defaultCacheContexts = ['languages:language_interface', 'theme', 'url.query_args:_wrapper_format', 'user.permissions'];
+  protected $defaultCacheContexts = ['languages:language_interface', 'theme', 'url.query_args:_wrapper_format', 'user.permissions', 'route'];
 
   /**
    * Tests the basic translation UI.
diff --git a/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php b/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
index 38955ab..6ed297e 100644
--- a/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
+++ b/core/modules/contextual/src/Tests/ContextualDynamicContextTest.php
@@ -47,7 +47,7 @@ class ContextualDynamicContextTest extends WebTestBase {
    *
    * @var array
    */
-  public static $modules = array('contextual', 'node', 'views', 'views_ui', 'language', 'menu_test');
+  public static $modules = array('block', 'contextual', 'node', 'views', 'views_ui', 'language', 'menu_test');
 
   protected function setUp() {
     parent::setUp();
@@ -55,6 +55,8 @@ protected function setUp() {
     $this->drupalCreateContentType(array('type' => 'page', 'name' => 'Basic page'));
     $this->drupalCreateContentType(array('type' => 'article', 'name' => 'Article'));
 
+    $this->drupalPlaceBlock('system_page_title_block');
+
     ConfigurableLanguage::createFromLangcode('it')->save();
     $this->rebuildContainer();
 
diff --git a/core/modules/help/src/Tests/HelpTest.php b/core/modules/help/src/Tests/HelpTest.php
index 2a423ba..792eb9a 100644
--- a/core/modules/help/src/Tests/HelpTest.php
+++ b/core/modules/help/src/Tests/HelpTest.php
@@ -24,7 +24,7 @@ class HelpTest extends WebTestBase {
    *
    * @var array.
    */
-  public static $modules = array('help_test');
+  public static $modules = array('block', 'help_test');
 
   /**
    * Use the Standard profile to test help implementations of many core modules.
@@ -46,6 +46,8 @@ protected function setUp() {
 
     $this->getModuleList();
 
+    $this->drupalPlaceBlock('system_page_title_block');
+
     // Create users.
     $this->adminUser = $this->drupalCreateUser(array('access administration pages', 'view the administration theme', 'administer permissions'));
     $this->anyUser = $this->drupalCreateUser(array());
diff --git a/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php b/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
index 3f7994b..9db2318 100644
--- a/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
+++ b/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
@@ -58,6 +58,8 @@ class LanguageUILanguageNegotiationTest extends WebTestBase {
   protected function setUp() {
     parent::setUp();
 
+    $this->drupalPlaceBlock('system_page_title_block');
+
     $admin_user = $this->drupalCreateUser(array('administer languages', 'translate interface', 'access administration pages', 'administer blocks'));
     $this->drupalLogin($admin_user);
   }
diff --git a/core/modules/shortcut/src/Tests/ShortcutLinksTest.php b/core/modules/shortcut/src/Tests/ShortcutLinksTest.php
index 84f315b..0a5f0b4 100644
--- a/core/modules/shortcut/src/Tests/ShortcutLinksTest.php
+++ b/core/modules/shortcut/src/Tests/ShortcutLinksTest.php
@@ -26,6 +26,16 @@ class ShortcutLinksTest extends ShortcutTestBase {
    */
   public static $modules = array('router_test', 'views', 'block');
 
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('system_page_title_block');
+  }
+
   /**
    * Tests that creating a shortcut works properly.
    */
diff --git a/core/modules/system/src/Tests/Render/DisplayVariantTest.php b/core/modules/system/src/Tests/Render/DisplayVariantTest.php
index 432aacf..3fcc1b0 100644
--- a/core/modules/system/src/Tests/Render/DisplayVariantTest.php
+++ b/core/modules/system/src/Tests/Render/DisplayVariantTest.php
@@ -21,7 +21,16 @@ class DisplayVariantTest extends WebTestBase {
    *
    * @var array
    */
-  public static $modules = array('display_variant_test');
+  public static $modules = array('block', 'display_variant_test');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('system_page_title_block');
+  }
 
   /**
    * Tests selecting the variant and passing configuration.
diff --git a/core/modules/system/src/Tests/System/PageTitleTest.php b/core/modules/system/src/Tests/System/PageTitleTest.php
index 56fa556..44bd578 100644
--- a/core/modules/system/src/Tests/System/PageTitleTest.php
+++ b/core/modules/system/src/Tests/System/PageTitleTest.php
@@ -23,7 +23,7 @@ class PageTitleTest extends WebTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'test_page_test', 'form_test');
+  public static $modules = array('block', 'node', 'test_page_test', 'form_test');
 
   protected $contentUser;
   protected $savedTitle;
@@ -36,6 +36,8 @@ protected function setUp() {
 
     $this->drupalCreateContentType(array('type' => 'page', 'name' => 'Basic page'));
 
+    $this->drupalPlaceBlock('system_page_title_block');
+
     $this->contentUser = $this->drupalCreateUser(array('create page content', 'access content', 'administer themes', 'administer site configuration', 'link to any page'));
     $this->drupalLogin($this->contentUser);
   }
diff --git a/core/modules/system/tests/modules/display_variant_test/src/Plugin/DisplayVariant/TestDisplayVariant.php b/core/modules/system/tests/modules/display_variant_test/src/Plugin/DisplayVariant/TestDisplayVariant.php
index 2057272..c952052 100644
--- a/core/modules/system/tests/modules/display_variant_test/src/Plugin/DisplayVariant/TestDisplayVariant.php
+++ b/core/modules/system/tests/modules/display_variant_test/src/Plugin/DisplayVariant/TestDisplayVariant.php
@@ -28,6 +28,13 @@ class TestDisplayVariant extends VariantBase implements PageVariantInterface {
   protected $mainContent = [];
 
   /**
+   * The page title.
+   *
+   * @var string
+   */
+  protected $title = '';
+
+  /**
    * {@inheritdoc}
    */
   public function setMainContent(array $main_content) {
@@ -38,6 +45,14 @@ public function setMainContent(array $main_content) {
   /**
    * {@inheritdoc}
    */
+  public function setTitle($title) {
+    $this->title = $title;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function build() {
     $config = $this->getConfiguration();
     if (empty($config['required_configuration'])) {
diff --git a/core/modules/user/src/Tests/Views/RolesRidArgumentTest.php b/core/modules/user/src/Tests/Views/RolesRidArgumentTest.php
index 642a691..c39d630 100644
--- a/core/modules/user/src/Tests/Views/RolesRidArgumentTest.php
+++ b/core/modules/user/src/Tests/Views/RolesRidArgumentTest.php
@@ -23,6 +23,22 @@ class RolesRidArgumentTest extends UserTestBase {
   public static $testViews = array('test_user_roles_rid');
 
   /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('block');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('system_page_title_block');
+  }
+
+  /**
    * Tests the generated title of a user: roles argument.
    */
   public function testArgumentTitle() {
diff --git a/core/modules/views/src/Tests/Plugin/DisabledDisplayTest.php b/core/modules/views/src/Tests/Plugin/DisabledDisplayTest.php
index e9052b4..6f69411 100644
--- a/core/modules/views/src/Tests/Plugin/DisabledDisplayTest.php
+++ b/core/modules/views/src/Tests/Plugin/DisabledDisplayTest.php
@@ -34,6 +34,8 @@ protected function setUp() {
 
     $this->enableViewsTestModule();
 
+    $this->drupalPlaceBlock('system_page_title_block');
+
     $admin_user = $this->drupalCreateUser(array('administer site configuration'));
     $this->drupalLogin($admin_user);
   }
diff --git a/core/modules/views_ui/src/Tests/DisplayTest.php b/core/modules/views_ui/src/Tests/DisplayTest.php
index 20667de..f8a1f95 100644
--- a/core/modules/views_ui/src/Tests/DisplayTest.php
+++ b/core/modules/views_ui/src/Tests/DisplayTest.php
@@ -35,6 +35,15 @@ class DisplayTest extends UITestBase {
   public static $modules = array('contextual');
 
   /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('system_page_title_block');
+  }
+
+  /**
    * Tests reordering of displays.
    */
   public function testReorderDisplay() {
diff --git a/core/modules/views_ui/src/Tests/HandlerTest.php b/core/modules/views_ui/src/Tests/HandlerTest.php
index c53ddd7..e710454 100644
--- a/core/modules/views_ui/src/Tests/HandlerTest.php
+++ b/core/modules/views_ui/src/Tests/HandlerTest.php
@@ -26,6 +26,16 @@ class HandlerTest extends UITestBase {
   public static $testViews = array('test_view_empty', 'test_view_broken');
 
   /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('system_page_title_block');
+  }
+
+
+  /**
    * Overrides \Drupal\views\Tests\ViewTestBase::schemaDefinition().
    *
    * Adds a uid column to test the relationships.