Force exclusion of PHPUnit extensions in Zend loader

library/Zend/Loader.php

@@ -79,7 +79,7 @@ class Zend_Loader
             $file = basename($file);
             self::loadFile($file, $dirs, true);
         } else {
-					if (false !== strpos($file, '\\'))
+					if ((false !== strpos($file, '\\')) || (false !== strpos($file, 'PHPUnit/Extensions')))
 						return;
 					self::_securityCheck($file);
 					include_once $file;