Zend_Http_Client_Adapter_Test::setResponse() and Zend_Http_Client_Adapter_Test::addResponse does not keep the same signature. Please change addResponse to act the same as setResponse e.g. convert response object to string.

Patch:

--- Test.org.php    2009-06-14 12:11:53.000000000 +0300
+++ Test.php    2009-06-14 12:11:05.000000000 +0300
@@ -168,10 +168,14 @@
     /**
      * Add another response to the response buffer.
      *
-     * @param string $response
+     * @param string Zend_Http_Response|$response
      */
     public function addResponse($response)
     {
+       if ($response instanceof Zend_Http_Response) {
+            $response = $response->asString();
+        }
+        
         $this->responses[] = $response;
     }