byte[] res = obs.getResponseStream().toByteArray();
MessageImpl resMsg = new MessageImpl();
resMsg.setContent(InputStream.class, new ByteArrayInputStream(res));
resMsg.put(Message.CONTENT_TYPE, obs.getResponseContentType());
resMsg.setExchange(new ExchangeImpl());
AttachmentDeserializer deserializer = new AttachmentDeserializer(resMsg);
deserializer.initializeAttachments();
Collection<Attachment> attachments = resMsg.getAttachments();
assertNotNull(attachments);
assertEquals(1, attachments.size());