diff --git a/core/includes/form.inc b/core/includes/form.inc
index 3383ead668..d507c978a8 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -416,7 +416,7 @@ function template_preprocess_textarea(&$variables) {
  * creates children elements that have their own labels and required markers,
  * but the parent element should have neither. Use this carefully because a
  * field without an associated label can cause accessibility challenges.
-
+ *
  * To associate the label with a different field, set the #label_for property
  * to the ID of the desired field.
  *
diff --git a/core/modules/file/src/Tests/FileFieldDisplayTest.php b/core/modules/file/src/Tests/FileFieldDisplayTest.php
index 2a27e24812..629eee7288 100644
--- a/core/modules/file/src/Tests/FileFieldDisplayTest.php
+++ b/core/modules/file/src/Tests/FileFieldDisplayTest.php
@@ -109,7 +109,7 @@ public function testNodeDisplay() {
     // Regression test. Verify the file fields don't contain duplicate HTML IDs.
     // @todo The ajax wrapper has a duplicate ID and is skipped in this test.
     // @see https://www.drupal.org/node/2346893
-    $this->assertNoDuplicateIds('', 'Other', ["edit-$field_name-ajax-wrapper"]);
+    $this->assertNoDuplicateIds('File fields do not contain duplicate IDs.', 'Other', ["edit-$field_name-ajax-wrapper"]);
   }
 
   /**