diff --git a/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module b/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
index 323af16..2d6ec48 100644
--- a/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
+++ b/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
@@ -45,5 +45,20 @@ function toolbar_test_toolbar() {
     '#weight' => 50,
   ];
 
+  $items['testing-tab-only'] = array(
+    '#type' => 'toolbar_item',
+    'tab' => array(
+      '#type' => 'link',
+      '#title' => t('Test tab without tray'),
+      '#url' => Url::fromRoute('<front>'),
+      '#options' => array(
+        'attributes' => array(
+          'id' => 'toolbar-tab-without-a-tray-testing',
+          'title' => t('Test tab has no tray'),
+        ),
+      ),
+    ),
+  );
+
   return $items;
 }
diff --git a/core/modules/toolbar/tests/src/Functional/ToolbarHookToolbarTest.php b/core/modules/toolbar/tests/src/Functional/ToolbarHookToolbarTest.php
index f3d3ce6..a126075 100644
--- a/core/modules/toolbar/tests/src/Functional/ToolbarHookToolbarTest.php
+++ b/core/modules/toolbar/tests/src/Functional/ToolbarHookToolbarTest.php
@@ -54,6 +54,12 @@ public function testHookToolbar() {
 
     // Assert that tray item descriptions are present.
     $this->assertRaw('title="Test link 1 title"');
+
+    // Assert that the tab registered by toolbar_test is present.
+    $this->assertRaw('id="toolbar-tab-without-a-tray-testing"');
+
+    // Assert that the tab item descriptions are present.
+    $this->assertRaw('title="Test tab has no tray"');
   }
 
 }