diff --git a/core/modules/system/lib/Drupal/system/Tests/Module/ModuleEnable.php b/core/modules/system/lib/Drupal/system/Tests/Module/ModuleEnable.php
index 427f86f..43a8044 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Module/ModuleEnable.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Module/ModuleEnable.php
@@ -58,6 +58,16 @@ function testModuleNameLength() {
     catch (ExtensionNameLengthException $e) {
       $this->pass($message);
     }
+
+    // Since for the UI, the submit callback uses FALSE, test that too.
+    $message = format_string('Exception thrown when enabling as if via the UI the module %name with a name length over the allowed maximum', array('%name' => $module_name));
+    try {
+      module_enable(array($module_name), FALSE);
+      $this->fail($message);
+    }
+    catch (ExtensionNameLengthException $e) {
+      $this->pass($message);
+    }
   }
 
 }