Fix express app's test

app.js

/**
 * Module dependencies.
 */

var express = require('express');

var app = module.exports = express.createServer();

// Configuration

app.configure(function(){
  app.set('views', __dirname + '/../views'); // <-- パスを修正
  app.set('view engine', 'jade');
  app.use(express.bodyDecoder());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.staticProvider(__dirname + '/../public')); // <-- パスを修正
});

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); 
});

app.configure('production', function(){
  app.use(express.errorHandler()); 
});

// Routes

app.get('/', function(req, res){
  res.render('index', {
    locals: {
      title: 'Express'
    }
  });
});

// Only listen on $ node app.js

if (!module.parent) {
  app.listen(3000);
  console.log("Express server listening on port %d", app.address().port)
}

app.test.js

// Run $ expresso

/**
 * Module dependencies.
 */

var assert = require('assert');  // <-- assert を require する
var app = require('app');        // <-- パスを /lib からの相対パスにする


module.exports = {
  'GET /': function(){           // <-- 引数の assert を消す
    assert.response(app,
      { url: '/' },
      { status: 200, headers: { 'Content-Type': 'text/html; charset=utf-8' }},
      function(res){
        assert.includes(res.body, '<title>Express</title>');
      });
  }
};