diff -u b/core/modules/system/src/Tests/Module/InstallUninstallTest.php b/core/modules/system/src/Tests/Module/InstallUninstallTest.php
--- b/core/modules/system/src/Tests/Module/InstallUninstallTest.php
+++ b/core/modules/system/src/Tests/Module/InstallUninstallTest.php
@@ -148,7 +148,7 @@
       $edit['modules[' . $module->info['package'] . '][' . $name . '][enable]'] = TRUE;
     }
     $this->drupalPostForm('admin/modules', $edit, t('Save configuration'));
-    $this->assertText(t('The configuration options have been saved.'), 'Modules status has been updated.');
+    $this->assertText(t('@count modules have been enabled: ', array('@count' => count($all_modules))), 'Modules status has been updated.');
   }
 
   /**