diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 25a6933..a6caec2 100755
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -160,6 +160,11 @@ function simpletest_script_help() {
 
   --color     Output text format results with color highlighting.
 
+  --summary-only
+
+              Do not output detailed assertion messages for exceptions and
+              failed tests.
+
   --verbose   Output detailed assertion messages in addition to summary.
 
   --keep-results
@@ -229,6 +234,7 @@ function simpletest_script_parse_args() {
     'class' => FALSE,
     'file' => FALSE,
     'color' => FALSE,
+    'summary-only' => FALSE,
     'verbose' => FALSE,
     'keep-results' => FALSE,
     'test_names' => array(),
@@ -1040,15 +1046,31 @@ function simpletest_script_reporter_timer_stop() {
 function simpletest_script_reporter_display_results() {
   global $args, $test_ids, $results_map;
 
-  if ($args['verbose']) {
+  if (!$args['summary-only'] || $args['verbose']) {
     // Report results.
-    echo "Detailed test results\n";
-    echo "---------------------\n";
 
-    $results = Database::getConnection('default', 'test-runner')
-      ->query("SELECT * FROM {simpletest} WHERE test_id IN (:test_ids) ORDER BY test_class, message_id", array(
-        ':test_ids' => $test_ids,
-      ));
+    if ($args['verbose']) {
+      $results = Database::getConnection('default', 'test-runner')
+        ->query("SELECT * FROM {simpletest} WHERE test_id IN (:test_ids) ORDER BY test_class, message_id", array(
+          ':test_ids' => $test_ids,
+        ));
+      echo "Detailed test results\n";
+      echo "---------------------\n";
+    }
+    else {
+      $results = Database::getConnection('default', 'test-runner')
+        ->query("SELECT count(*) FROM {simpletest} WHERE test_id IN (:test_ids) AND status IN ('fail', 'exception') ORDER BY test_class, message_id", array(
+          ':test_ids' => $test_ids,
+        ));
+      if ($results->fetchColumn() > 0) {
+        $results = Database::getConnection('default', 'test-runner')
+          ->query("SELECT * FROM {simpletest} WHERE test_id IN (:test_ids) AND status IN ('fail', 'exception') ORDER BY test_class, message_id", array(
+            ':test_ids' => $test_ids,
+          ));
+        echo "Detailed failures and exceptions\n";
+        echo "--------------------------------\n";
+      }
+    }
     $test_class = '';
     foreach ($results as $result) {
       if (isset($results_map[$result->status])) {