Index: modules/simpletest/simpletest.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/simpletest.module,v
retrieving revision 1.77
diff -u -r1.77 simpletest.module
--- modules/simpletest/simpletest.module	9 Oct 2009 01:00:03 -0000	1.77
+++ modules/simpletest/simpletest.module	21 Oct 2009 04:32:06 -0000
@@ -434,11 +434,11 @@
  * Find all leftover temporary directories and remove them.
  */
 function simpletest_clean_temporary_directories() {
-  $files = scandir('public://');
+  $files = scandir('public://simpletest');
   $count = 0;
   foreach ($files as $file) {
-    $path = 'public://' . $file;
-    if (is_dir($path) && preg_match('/^simpletest\d+/', $file)) {
+    $path = 'public://simpletest/' . $file;
+    if (is_dir($path) && is_numeric($file)) {
       file_unmanaged_delete_recursive($path);
       $count++;
     }
Index: modules/simpletest/drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.164
diff -u -r1.164 drupal_web_test_case.php
--- modules/simpletest/drupal_web_test_case.php	20 Oct 2009 00:55:29 -0000	1.164
+++ modules/simpletest/drupal_web_test_case.php	21 Oct 2009 04:32:06 -0000
@@ -1046,8 +1046,14 @@
 
     // Create test directory ahead of installation so fatal errors and debug
     // information can be logged during installation process.
-    $directory = $this->originalFileDirectory . '/simpletest/' . substr($db_prefix, 10);
+    // Use temporary files directory with the same prefix as the database.
+    $public_files_directory  = $this->originalFileDirectory . '/simpletest/' . substr($db_prefix, 10);
+    $private_files_directory = $public_files_directory . '/private';
+
+    // Create the directories
+    $directory = file_directory_path('public');
     file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
+    file_prepare_directory($private_files_directory, FILE_CREATE_DIRECTORY);
 
     // Log fatal errors.
     ini_set('log_errors', 1);
@@ -1106,21 +1112,12 @@
     unset($GLOBALS['conf']['language_default']);
     $language = language_default();
 
-    // Use the test mail class instead of the default mail handler class.
-    variable_set('mail_system', array('default-system' => 'TestingMailSystem'));
-
-    // Use temporary files directory with the same prefix as the database.
-    $public_files_directory  = $this->originalFileDirectory . '/' . $db_prefix;
-    $private_files_directory = $public_files_directory . '/private';
-
     // Set path variables
     variable_set('file_public_path', $public_files_directory);
     variable_set('file_private_path', $private_files_directory);
 
-    // Create the directories
-    $directory = file_directory_path('public');
-    file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
-    file_prepare_directory($private_files_directory, FILE_CREATE_DIRECTORY);
+    // Use the test mail class instead of the default mail handler class.
+    variable_set('mail_system', array('default-system' => 'TestingMailSystem'));
 
     drupal_set_time_limit($this->timeLimit);
   }
@@ -1175,7 +1172,7 @@
 
     if (preg_match('/simpletest\d+/', $db_prefix)) {
       // Delete temporary files directory.
-      file_unmanaged_delete_recursive($this->originalFileDirectory . '/' . $db_prefix);
+      file_unmanaged_delete_recursive($this->originalFileDirectory . '/simpletest/' . substr($db_prefix, 10));
 
       // Remove all prefixed tables (all the tables in the schema).
       $schema = drupal_get_schema(NULL, TRUE);