diff --git a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
index fb35980..c69869f 100644
--- a/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/src/Tests/ToolbarAdminMenuTest.php
@@ -380,6 +380,7 @@ public function testBackToSiteLink() {
   }
 
   /**
+   * Tests that external links added to the menu appear in the toolbar.
    */
   public function testExternalLink() {
     /** @var \Drupal\system\MenuInterface $menu */
@@ -392,12 +393,9 @@ public function testExternalLink() {
     ];
     $this->drupalPostForm($menu->urlInfo('add-link-form'), $edit, 'Save');
 
-    // @todo Remove this.
-    drupal_flush_all_caches();
-
     $this->drupalGet($menu->urlInfo('edit-form'));
-
     $this->assertText('External URL');
+
     $this->drupalGet(Url::fromRoute('<front>'));
     $this->assertText('External URL');
   }