Index: modules/simpletest/drupal_web_test_case.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/simpletest/drupal_web_test_case.php,v
retrieving revision 1.53
diff -u -p -r1.53 drupal_web_test_case.php
--- modules/simpletest/drupal_web_test_case.php	1 Nov 2008 21:21:35 -0000	1.53
+++ modules/simpletest/drupal_web_test_case.php	31 Oct 2008 01:30:20 -0000
@@ -770,8 +770,10 @@ class DrupalWebTestCase {
       // Ensure that the internal logged in variable is reset.
       $this->_logged_in = FALSE;
 
-      // Reload module list to ensure that test module hooks aren't called after tests.
+      // Reload module list and implementations to ensure that test module hooks
+      // aren't called after tests.
       module_list(TRUE);
+      module_implements(MODULE_IMPLEMENTS_CLEAR_CACHE);
 
       // Rebuild caches.
       $this->refreshVariables();