app_spec.js

(function() {

  describe('Application', function() {
    it('should exists', function() {
       var app = new Application();
       app.should.be.an.instanceof(Application);
    });
  });

}).call(this);

function Application(template_id){
  var source = $(template_id);
  this.template = Handlebars.compile(source.html());
}

Application.prototype.render = function(params){
  return this.template(params);
};

index.tpl

<script id="test-template" type="text/x-handlebars-template">
    <p></p>
 </script>

package.json

{
  "engines": {
    "node": "0.6.13",
    "npm":  "1.1.15"},
  "dependencies": {
    "express": "2.2.0",
    "should": "0.6.5",
    "mocha" 
  "main": app/server.js"
}

server.js

var express = require('express'),
        app = express.createServer();

 app.configure(function(){
    app.set('views', __dirname + '/views');
    app.set('views');
    // => "/absolute/path/to/views"

    app.enable('some feature');
    // same as app.set('some feature', true);

    app.disable('some feature');
    // same as app.set('some feature', false);

    app.enabled('some feature')
    // => false
 });

app.get('/', function(req, res){
  // res.send('hello world');
});

app.listen(3000);

templat

it('should render handlebars template', function(){
  var app = new Application("#test-template");
  app.render({name: "kuba"}).should.equal("<p>kuba</p>");
});