diff --git a/core/modules/comment/src/Tests/CommentAnonymousTest.php b/core/modules/comment/src/Tests/CommentAnonymousTest.php
index fd813f7..78c38e2 100644
--- a/core/modules/comment/src/Tests/CommentAnonymousTest.php
+++ b/core/modules/comment/src/Tests/CommentAnonymousTest.php
@@ -40,6 +40,32 @@ function testAnonymous() {
     $this->setCommentAnonymous(COMMENT_ANONYMOUS_MAYNOT_CONTACT);
     $this->drupalLogout();
 
+    // Preview comments (with skip grant permission).
+    $edit = [];
+    $title = $this->randomMachineName(8);
+    $body = $this->randomMachineName(16);
+    $edit['subject[0][value]'] = $title;
+    $edit['comment_body[0][value]'] = $body;
+    $this->drupalPostForm($this->node->urlInfo(), $edit, t('Preview'));
+    // Cannot use assertRaw here since both title and body are in the form.
+    $preview = (string) $this->cssSelect('.preview')[0]->asXML();
+    $this->assertTrue(strpos($preview, $title) !== FALSE, 'Anonymous user can preview comment title.');
+    $this->assertTrue(strpos($preview, $body) !== FALSE, 'Anonymous user can preview comment body.');
+
+    // Preview comments (without skip grant permission).
+    user_role_revoke_permissions(RoleInterface::ANONYMOUS_ID, ['skip comment approval']);
+    $edit = [];
+    $title = $this->randomMachineName(8);
+    $body = $this->randomMachineName(16);
+    $edit['subject[0][value]'] = $title;
+    $edit['comment_body[0][value]'] = $body;
+    $this->drupalPostForm($this->node->urlInfo(), $edit, t('Preview'));
+    // Cannot use assertRaw here since both title and body are in the form.
+    $preview = (string) $this->cssSelect('.preview')[0]->asXML();
+    $this->assertTrue(strpos($preview, $title) !== FALSE, 'Anonymous user can preview comment title.');
+    $this->assertTrue(strpos($preview, $body) !== FALSE, 'Anonymous user can preview comment body.');
+    user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, ['skip comment approval']);
+
     // Post anonymous comment without contact info.
     $anonymous_comment1 = $this->postComment($this->node, $this->randomMachineName(), $this->randomMachineName());
     $this->assertTrue($this->commentExists($anonymous_comment1), 'Anonymous comment without contact info found.');
@@ -167,4 +193,5 @@ function testAnonymous() {
     $this->drupalGet('comment/reply/node/' . $this->node->id() . '/comment/' . $anonymous_comment2->id());
     $this->assertResponse(403);
   }
+
 }