diff --git a/core/modules/forum/src/Tests/ForumIndexTest.php b/core/modules/forum/src/Tests/ForumIndexTest.php
index b9ee537..2dc0310 100644
--- a/core/modules/forum/src/Tests/ForumIndexTest.php
+++ b/core/modules/forum/src/Tests/ForumIndexTest.php
@@ -58,6 +58,7 @@ function testForumIndexStatus() {
     // Verify that the node appears on the index.
     $this->drupalGet('forum/' . $tid);
     $this->assertText($title, 'Published forum topic appears on index.');
+    $this->assertCacheTag('node_list');
 
     // Unpublish the node.
     $this->drupalPostForm('node/' . $node->id() . '/edit', array(), t('Save and unpublish'));