diff --git a/core/modules/config/src/Tests/ConfigSchemaTest.php b/core/modules/config/src/Tests/ConfigSchemaTest.php
index da3e3b3..19967a1 100644
--- a/core/modules/config/src/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/src/Tests/ConfigSchemaTest.php
@@ -282,9 +282,9 @@ function testSchemaData() {
 
     // Check nested array of properties.
     $list = $meta->get('page');
-    $this->assertTrue(!empty($list->get('front')));
-    $this->assertTrue(!empty($list->get('403')));
-    $this->assertTrue(!empty($list->get('404')));
+    $this->assertTrue((bool) $list->get('front'));
+    $this->assertTrue((bool) $list->get('403'));
+    $this->assertTrue((bool) $list->get('404'));
     $this->assertEqual($list->get('front')->getValue(), 'user/login', 'Got the right value for page.front data from the list.');
 
     // And test some TraversableTypedDataInterface methods.