Zend_Mail::clearDefaultTransport PHP Method

    public static function clearDefaultTransport()
    {
        self::$_defaultTransport = null;
    }

 public function tearDown()
 {
     Zend_Mail::clearDefaultTransport();
     // Restore original autoloaders
     $loaders = spl_autoload_functions();
     foreach ($loaders as $loader) {
         spl_autoload_unregister($loader);
     }
     foreach ($this->loaders as $loader) {
         spl_autoload_register($loader);
     }
     // Reset autoloader instance so it doesn't affect other tests
     Zend_Loader_Autoloader::resetInstance();
 }