diff --git a/core/modules/locale/locale.test b/core/modules/locale/locale.test
index 5c49be4..3a1e4ee 100644
--- a/core/modules/locale/locale.test
+++ b/core/modules/locale/locale.test
@@ -2823,3 +2823,28 @@ class LocaleLanguageNegotiationInfoFunctionalTest extends DrupalWebTestCase {
     }
   }
 }
+
+class LocaleLibraryInfoAlterTest extends DrupalWebTestCase {
+  public static function getInfo() {
+    return array(
+      'name' => 'Javascript library localisation',
+      'description' => 'Tests the localisation of javascript libraries.',
+      'group' => 'Locale',
+    );
+  }
+
+  function setUp() {
+    parent::setUp('locale', 'locale_test');
+  }
+
+  /**
+  * Verify that locale_library_info_alter adds localisation to the datepicker.
+  *
+  * @see locale_library_info_alter()
+  */
+  public function testLibraryInfoAlter() {
+    drupal_add_library('system', 'ui.datepicker');
+    $scripts = drupal_get_js('footer');
+    $this->assertTrue(strpos($scripts, 'locale.datepicker.js'), t('locale.datepicker.js added to scripts in footer.'));
+  }
+}