Index: modules/simpletest/drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.158
diff -u -p -r1.158 drupal_web_test_case.php
--- modules/simpletest/drupal_web_test_case.php	11 Oct 2009 03:07:19 -0000	1.158
+++ modules/simpletest/drupal_web_test_case.php	11 Oct 2009 11:58:58 -0000
@@ -1621,6 +1621,11 @@ class DrupalWebTestCase extends DrupalTe
             $upload[$name] = $edit[$name];
             unset($edit[$name]);
             break;
+          case 'hidden':
+            if ($edit[$name] == $value) {
+              unset($edit[$name]);
+            }
+            break;
         }
       }
       if (!isset($post[$name]) && !$done) {