.../modules/entity_test/entity_test.services.yml   |  4 +++
 .../src/Cache/EntityTestViewGrantsCacheContext.php | 33 ++++++++++++++++++++++
 .../Tests/Core/Render/RendererBubblingTest.php     |  5 ++++
 3 files changed, 42 insertions(+)

diff --git a/core/modules/system/tests/modules/entity_test/entity_test.services.yml b/core/modules/system/tests/modules/entity_test/entity_test.services.yml
index 8769fbc..75e1bf3 100644
--- a/core/modules/system/tests/modules/entity_test/entity_test.services.yml
+++ b/core/modules/system/tests/modules/entity_test/entity_test.services.yml
@@ -4,3 +4,7 @@ services:
     arguments: ['@state']
     tags:
       - { name: event_subscriber }
+  cache_context.entity_test_view_grants:
+    class: Drupal\entity_test\Cache\EntityTestViewGrantsCacheContext
+    tags:
+      - { name: cache.context }
diff --git a/core/modules/system/tests/modules/entity_test/src/Cache/EntityTestViewGrantsCacheContext.php b/core/modules/system/tests/modules/entity_test/src/Cache/EntityTestViewGrantsCacheContext.php
index e69de29..9c2acc5 100644
--- a/core/modules/system/tests/modules/entity_test/src/Cache/EntityTestViewGrantsCacheContext.php
+++ b/core/modules/system/tests/modules/entity_test/src/Cache/EntityTestViewGrantsCacheContext.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\entity_test\Cache\EntityTestViewViewGrantsCacheContext.
+ */
+
+namespace Drupal\entity_test\Cache;
+
+use Drupal\Core\Cache\CacheContextInterface;
+
+/**
+ * Defines the entity_test view grants cache context service.
+ *
+ * @see \Drupal\node\Cache\NodeAccessViewGrantsCacheContext
+ */
+class EntityTestViewViewGrantsCacheContext implements CacheContextInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t("Entity test view grants");
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext() {
+    return md5(time());
+  }
+
+}
diff --git a/core/tests/Drupal/Tests/Core/Render/RendererBubblingTest.php b/core/tests/Drupal/Tests/Core/Render/RendererBubblingTest.php
index 929a307..d0108ce 100644
--- a/core/tests/Drupal/Tests/Core/Render/RendererBubblingTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/RendererBubblingTest.php
@@ -23,6 +23,11 @@ class RendererBubblingTest extends RendererTestBase {
   protected function setUp() {
     parent::setUp();
 
+    // Ensure the container lists the valid cache contexts.
+    $container = \Drupal::getContainer();
+    $container->setParameter('cache_contexts', ['foo', 'bar', 'baz', 'user.roles', 'child.cache_context']);
+    \Drupal::setContainer($container);
+
     $this->setUpRequest();
     $this->setupMemoryCache();
   }