Changed tests to not use live udp server as it fails on CI

test/gelfAppender.js

@@ -1,31 +1,30 @@
 var vows = require('vows')
 , log4js = require('../lib/log4js')
 , assert = require('assert')
-, util = require('util')
 , dgram = require("dgram");
 
-log4js.configure({ "appenders": [{"type": "gelf"}] }, undefined);
+var fakeClient = {
+  packetLength: 0,
+  close: function() {
+  },
+  send: function(pkt, offset, pktLength, port, host) {
+    this.packetLength = pktLength;
+  } 
+};
+
+log4js.configure({ "appenders": [{"type": "gelf", "client": fakeClient}] }, undefined);
 
 vows.describe('log4js gelfAppender').addBatch({
 
     'with default gelfAppender settings': {
         topic: function() {
             var logger = log4js.getLogger();
-
-            //Start local dgram server to act as GELF server
-            var server = dgram.createSocket("udp4");
-            //Assert as soon as message arrives
-            server.on("message", this.callback);
-            //Send a fake message as soon as server is ready
-            server.on("listening", function () {
-              logger.info("This should be a packet of size 161 bytes at the server");
-            });
-
-            //Listen on default values
-            server.bind(12201, 'localhost');
+            var self = this;
+            logger.info('Fake log message');
+            callback();
         },
         'should receive log messages at the local gelf server': function(err, packet) {
-            assert.ok(packet.size > 0, "Recevied blank message");
+            assert.ok(fakeClient.packetLength > 0, "Recevied blank message");
         }
     }
 }).export(module);