diff --git a/core/modules/block/src/Controller/BlockController.php b/core/modules/block/src/Controller/BlockController.php
index 2779a9b..6200a4e 100644
--- a/core/modules/block/src/Controller/BlockController.php
+++ b/core/modules/block/src/Controller/BlockController.php
@@ -81,6 +81,8 @@ public function demo($theme) {
       );
     }
 
+    $page['#cache'] = [];
+
     return $page;
   }
 
diff --git a/core/modules/config/tests/config_test/src/SchemaListenerController.php b/core/modules/config/tests/config_test/src/SchemaListenerController.php
index 1a6b28c..2545645 100644
--- a/core/modules/config/tests/config_test/src/SchemaListenerController.php
+++ b/core/modules/config/tests/config_test/src/SchemaListenerController.php
@@ -46,6 +46,7 @@ public function test() {
     catch (SchemaIncompleteException $e) {
       return [
         '#markup' => $e->getMessage(),
+        '#cache' => [],
       ];
     }
   }
diff --git a/core/modules/dynamic_page_cache/tests/dynamic_page_cache_test/src/DynamicPageCacheTestController.php b/core/modules/dynamic_page_cache/tests/dynamic_page_cache_test/src/DynamicPageCacheTestController.php
index e8ebeba..7187a37 100644
--- a/core/modules/dynamic_page_cache/tests/dynamic_page_cache_test/src/DynamicPageCacheTestController.php
+++ b/core/modules/dynamic_page_cache/tests/dynamic_page_cache_test/src/DynamicPageCacheTestController.php
@@ -53,6 +53,7 @@ public function htmlWithoutCacheability() {
     return [
       'content' => [
         '#markup' => 'Hello world.',
+        '#cache' => [],
       ],
     ];
   }
diff --git a/core/modules/system/tests/modules/batch_test/src/Controller/BatchTestController.php b/core/modules/system/tests/modules/batch_test/src/Controller/BatchTestController.php
index 35e5bea..d83f8c1 100644
--- a/core/modules/system/tests/modules/batch_test/src/Controller/BatchTestController.php
+++ b/core/modules/system/tests/modules/batch_test/src/Controller/BatchTestController.php
@@ -23,6 +23,7 @@ public function testRedirect() {
     return array(
       'success' => array(
         '#markup' => 'Redirection successful.',
+        '#cache' => [],
       )
     );
   }
@@ -107,6 +108,7 @@ function testProgrammatic($value = 1) {
     return array(
       'success' => array(
         '#markup' => 'Got out of a programmatic batched form.',
+        '#cache' => [],
       )
     );
   }
diff --git a/core/modules/system/tests/modules/common_test/src/Controller/CommonTestController.php b/core/modules/system/tests/modules/common_test/src/Controller/CommonTestController.php
index 383be8f..03b3208 100644
--- a/core/modules/system/tests/modules/common_test/src/Controller/CommonTestController.php
+++ b/core/modules/system/tests/modules/common_test/src/Controller/CommonTestController.php
@@ -56,6 +56,7 @@ public function typeLinkActiveClass() {
           'set_active_class' => TRUE,
         ),
       ),
+      '#cache' => [],
     );
   }
 
diff --git a/core/modules/system/tests/modules/early_rendering_controller_test/src/EarlyRenderingTestController.php b/core/modules/system/tests/modules/early_rendering_controller_test/src/EarlyRenderingTestController.php
index d560f94..3ad2ba5 100644
--- a/core/modules/system/tests/modules/early_rendering_controller_test/src/EarlyRenderingTestController.php
+++ b/core/modules/system/tests/modules/early_rendering_controller_test/src/EarlyRenderingTestController.php
@@ -68,6 +68,7 @@ public function renderArray() {
         $elements = $this->earlyRenderContent();
         return $elements;
       }],
+      '#cache' => [],
     ];
   }
 
@@ -75,6 +76,7 @@ public function renderArrayEarly() {
     $render_array = $this->earlyRenderContent();
     return [
       '#markup' => $this->renderer->render($render_array),
+      '#cache' => [],
     ];
   }
 
diff --git a/core/modules/system/tests/modules/router_test_directory/src/TestContent.php b/core/modules/system/tests/modules/router_test_directory/src/TestContent.php
index dc2caca..a4e4eb9 100644
--- a/core/modules/system/tests/modules/router_test_directory/src/TestContent.php
+++ b/core/modules/system/tests/modules/router_test_directory/src/TestContent.php
@@ -43,7 +43,7 @@ public static function create(ContainerInterface $container) {
    * Provides example content for testing route enhancers.
    */
   public function test1() {
-    return ['#markup' => 'abcde'];
+    return ['#markup' => 'abcde', '#cache' => []];
   }
 
   /**
@@ -54,13 +54,13 @@ public function test1() {
    */
   public function test11() {
     $account = $this->currentUser();
-    return ['#markup' => $account->getUsername()];
+    return ['#markup' => $account->getUsername(), '#cache' => ['context' => 'user']];
   }
 
   public function testAccount(UserInterface $user) {
     $current_user_name = $this->currentUser()->getUsername();
     $this->currentUser()->setAccount($user);
-    return ['#markup' => $current_user_name . ':' . $user->getUsername()];
+    return ['#markup' => $current_user_name . ':' . $user->getUsername(), '#cache' => ['context' => 'user']];
   }
 
   /**