diff --git a/core/modules/system/src/Tests/Common/PageRenderTest.php b/core/modules/system/src/Tests/Common/PageRenderTest.php
index bb2def2..b76c969 100644
--- a/core/modules/system/src/Tests/Common/PageRenderTest.php
+++ b/core/modules/system/src/Tests/Common/PageRenderTest.php
@@ -54,6 +54,9 @@ function assertPageRenderHookExceptions($module, $hook) {
     $page = [];
     $html_renderer->invokePageAttachmentHooks($page);
 
+    // Assert that hooks can set cache tags.
+    $this->assertEqual($page['#cache']['tags'], ['example']);
+
     // Assert an invalid hook implementation doesn't trigger an exception.
     \Drupal::state()->set($module . '.' . $hook . '.descendant_attached', TRUE);
     $assertion = $hook . '() implementation that sets #attached on a descendant triggers an exception';