@SuppressWarnings("unchecked")
st
public void testCacheControlPreserveExisting() {

	Message message = new MessageImpl();
	ByteArrayOutputStream sw = new ByteArrayOutputStream();
	message.setContent(OutputStream.class , sw);
	MetadataMap<String, Object> headers = (MetadataMap<String, Object>) message.get(Message.PROTOCOL_HEADERS);
	 if (headers == null) {
         headers = new MetadataMap<String, Object>();
     }  
	headers.add("Test", new String("Test"));
    message.put(Message.PROTOCOL_HEADERS, headers);
	FixedCacheControlOutInterceptor interceptor = new FixedCacheControlOutInterceptor();
	
	interceptor.handleMessage(message);
	
aders = (MetadataMap<String, Object>) message.get(Message.PROTOCOL_HEADERS);
List)headers.get("Cache-Control")).get(0);
	assertEquals(((List)headers.get("Cache-Control")).get(0), "no-cache");
	assertEquals(((List)headers.get("Expires")).get(0), "-1");
	assertEquals(((List)headers.get("Test")).get(0), new String("Test"));
}