added expresso unit tests.

package.json

@@ -9,5 +9,8 @@
   },
   "engines": {
     "node": "0.8.x"
+  },
+  "scripts": {
+    "test": "expresso test/*"
   }
 }

test/join.js

@@ -0,0 +1,48 @@
+
+var assert = require('assert');
+var express = require('express');
+
+exports.testAsync = function(beforeExit) {
+    var io = require('socket.io-client');
+    var socket = io.connect('http://localhost:5000');
+
+    assert(socket !== null);
+    assert(socket !== undefined);    
+    var wasConnected = false;    
+    var timeout;
+    socket.on('connect', function(err) {
+        wasConnected = true;
+        assert.isUndefined(err);
+
+        // send the join message...
+        socket.emit('join', JSON.stringify({ userName: 'testusername', userId: '1234', avatar: 'someImage.png' }));
+
+        // disconnect if no answer in 1/2 sec.
+        timeout = setTimeout(function() {
+            socket.disconnect();
+        }, 1000);
+    });
+
+    var connectResponseRecvd = false;
+
+    socket.on('chat', function(data) {
+        connectResponseRecvd = true;
+        clearTimeout(timeout);
+
+        var msg = JSON.parse(data);
+        assert(msg.action == 'control');
+        assert(msg.userId = '1234');
+        assert(msg.avatar == 'someImage.png');
+        assert(msg.userName == 'testusername');
+
+        socket.disconnect();
+    });
+
+    beforeExit(function(){
+        console.log("exit");
+        socket.disconnect();
+        assert(wasConnected, "socket.io never connected to server.");
+        assert(connectResponseRecvd, "No response to connect message.")
+    });
+};
+