add first socket.io test

test/chat-test.js

@@ -0,0 +1,25 @@
+var io = require('socket.io-client')
+  , should = require('should')
+  , chat = require('../lib/chat');
+
+describe('chat', function() {
+  var port = 8081;
+  it('notifies the users when someone joins the chat') {
+    var server = chat(port);
+    var joe = io.connect('http://localhost:' + port);
+    var jon = io.connect('http://localhost:' + port);
+
+    // we're done after joe and jon are both notified
+    var notification = 0;
+    function joined(data) {
+      notification += 1;
+      data.username.should.equal('jane');
+      if (notification == 2) done();
+    }
+
+    joe.on('joined', joined);
+    jon.on('joined', joined);
+    var jane = io.connect('http://localhost:' + port);
+    jane.emit('joined', {username: 'jane'});
+  });
+});