commit 3b20a92c295c4b5b03f2dd59a4f379ae5694a987
Author: Joel Pittet <joel@pittet.ca>
Date:   Fri Mar 7 21:01:48 2014 -0800

    colon

diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index dc6ca34..4a1d7e4 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -326,7 +326,7 @@ function _simpletest_batch_operation($test_list_init, $test_id, &$context) {
   foreach (element_children($test_results) as $class) {
     $class_test_result = $test_results[$class] + array(
       '#theme' => 'simpletest_result_summary',
-      '#label' => t($test_results[$class]['#name']),
+      '#label' => t($test_results[$class]['#name'] . ':'),
     );
     array_unshift($items, drupal_render($class_test_result));
   }