@Test
 public void testSerialisation() throws IOException {
   Twitter tt = TwitterTest.newTestTwitter();
   IHttpClient client = tt.getHttpClient();
   XStreamBinaryConverter conv = new XStreamBinaryConverter();
   { // serialise
     String s = conv.toString(client);
     IHttpClient c2 = (IHttpClient) conv.fromString(s);
   }
   { // serialise
     String s = conv.toString(tt);
     Twitter tt2 = (Twitter) conv.fromString(s);
   }
 }
 Twitter_Users(Twitter jtwit) {
   this.jtwit = jtwit;
   http = jtwit.getHttpClient();
 }