Index: drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/contributions/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.2.2.3.2.44
diff -u -r1.2.2.3.2.44 drupal_web_test_case.php
--- drupal_web_test_case.php	17 Sep 2009 21:32:48 -0000	1.2.2.3.2.44
+++ drupal_web_test_case.php	25 Sep 2009 19:56:20 -0000
@@ -1535,7 +1535,8 @@
             // is broken. This is a less than elegant workaround. Alternatives
             // are being explored at #253506.
             foreach ($upload as $key => $file) {
-              $file = drupal_realpath($file);
+//              $file = drupal_realpath($file);
+              $file = realpath($file);
               if ($file && is_file($file)) {
                 $post[$key] = '@' . $file;
               }