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diff --git a/web/core/modules/comment/tests/src/Functional/CommentCacheTagsTest.php b/web/core/modules/comment/tests/src/Functional/CommentCacheTagsTest.php
new file mode 100644
index 000000000..0b0f4863a
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Functional/CommentCacheTagsTest.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\comment\CommentInterface;
+use Drupal\comment\CommentManagerInterface;
+use Drupal\comment\Entity\Comment;
+use Drupal\comment\Tests\CommentTestTrait;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\Tests\system\Functional\Entity\EntityWithUriCacheTagsTestBase;
+use Drupal\user\Entity\Role;
+use Drupal\user\RoleInterface;
+
+/**
+ * Tests the Comment entity's cache tags.
+ *
+ * @group comment
+ */
+class CommentCacheTagsTest extends EntityWithUriCacheTagsTestBase {
+
+  use CommentTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['comment'];
+
+  /**
+   * @var \Drupal\entity_test\Entity\EntityTest
+   */
+  protected $entityTestCamelid;
+
+  /**
+   * @var \Drupal\entity_test\Entity\EntityTest
+   */
+  protected $entityTestHippopotamidae;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Give anonymous users permission to view comments, so that we can verify
+    // the cache tags of cached versions of comment pages.
+    $user_role = Role::load(RoleInterface::ANONYMOUS_ID);
+    $user_role->grantPermission('access comments');
+    $user_role->save();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function createEntity() {
+    // Create a "bar" bundle for the "entity_test" entity type and create.
+    $bundle = 'bar';
+    entity_test_create_bundle($bundle, NULL, 'entity_test');
+
+    // Create a comment field on this bundle.
+    $this->addDefaultCommentField('entity_test', 'bar', 'comment');
+
+    // Display comments in a flat list; threaded comments are not render cached.
+    $field = FieldConfig::loadByName('entity_test', 'bar', 'comment');
+    $field->setSetting('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT);
+    $field->save();
+
+    // Create a "Camelids" test entity that the comment will be assigned to.
+    $this->entityTestCamelid = EntityTest::create([
+      'name' => 'Camelids',
+      'type' => 'bar',
+    ]);
+    $this->entityTestCamelid->save();
+
+    // Create a "Llama" comment.
+    $comment = Comment::create([
+      'subject' => 'Llama',
+      'comment_body' => [
+        'value' => 'The name "llama" was adopted by European settlers from native Peruvians.',
+        'format' => 'plain_text',
+      ],
+      'entity_id' => $this->entityTestCamelid->id(),
+      'entity_type' => 'entity_test',
+      'field_name' => 'comment',
+      'status' => CommentInterface::PUBLISHED,
+    ]);
+    $comment->save();
+
+    return $comment;
+  }
+
+  /**
+   * Test that comments correctly invalidate the cache tag of their host entity.
+   */
+  public function testCommentEntity() {
+    $this->verifyPageCache($this->entityTestCamelid->urlInfo(), 'MISS');
+    $this->verifyPageCache($this->entityTestCamelid->urlInfo(), 'HIT');
+
+    // Create a "Hippopotamus" comment.
+    $this->entityTestHippopotamidae = EntityTest::create([
+      'name' => 'Hippopotamus',
+      'type' => 'bar',
+    ]);
+    $this->entityTestHippopotamidae->save();
+
+    $this->verifyPageCache($this->entityTestHippopotamidae->urlInfo(), 'MISS');
+    $this->verifyPageCache($this->entityTestHippopotamidae->urlInfo(), 'HIT');
+
+    $hippo_comment = Comment::create([
+      'subject' => 'Hippopotamus',
+      'comment_body' => [
+        'value' => 'The common hippopotamus (Hippopotamus amphibius), or hippo, is a large, mostly herbivorous mammal in sub-Saharan Africa',
+        'format' => 'plain_text',
+      ],
+      'entity_id' => $this->entityTestHippopotamidae->id(),
+      'entity_type' => 'entity_test',
+      'field_name' => 'comment',
+      'status' => CommentInterface::PUBLISHED,
+    ]);
+    $hippo_comment->save();
+
+    // Ensure that a new comment only invalidates the commented entity.
+    $this->verifyPageCache($this->entityTestCamelid->urlInfo(), 'HIT');
+    $this->verifyPageCache($this->entityTestHippopotamidae->urlInfo(), 'MISS');
+    $this->assertText($hippo_comment->getSubject());
+
+    // Ensure that updating an existing comment only invalidates the commented
+    // entity.
+    $this->entity->save();
+    $this->verifyPageCache($this->entityTestCamelid->urlInfo(), 'MISS');
+    $this->verifyPageCache($this->entityTestHippopotamidae->urlInfo(), 'HIT');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getAdditionalCacheContextsForEntity(EntityInterface $entity) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * Each comment must have a comment body, which always has a text format.
+   */
+  protected function getAdditionalCacheTagsForEntity(EntityInterface $entity) {
+    /** @var \Drupal\comment\CommentInterface $entity */
+    return [
+      'config:filter.format.plain_text',
+      'user:' . $entity->getOwnerId(),
+      'user_view',
+    ];
+  }
+
+}