Mocha based URLs HTTP code checker

test.js

/**
 * Created by ronan on 27/07/2015.
 *
 * Principe:
 *
 * 1 - Create an urls.json file as described below
 * 2 - install npm deps
 * 3 - run mocha tests, the regular way
 *
 * How-to:
 *
 *   $ npm install mocha chai it-each
 *   $ [EDIT urls.json]
 *   $ mkdir test; cd test;
 *   $ curl -O https://gist.githubusercontent.com/ronanguilloux/3ca84c03dd5f17323296/raw/test.js
 *   $ cd ../
 *   $ node_modules/mocha/bin/mocha
 *
 *
 * urls.json example:

 {
  "list": [
    {
      "url": "http://www.domain.org/.git",
      "expected": 404,
    }
  ]
}
 *
 * Apache2 HTTP rules to set 4xx codes

 RedirectMatch 404 /\.git
 RedirectMatch 404 /*\.md
 RedirectMatch 404 /*\.prod
 RedirectMatch 404 /*\.preprod
 RedirectMatch 404 /*\.dev
 RedirectMatch 404 /*\.dist
 RedirectMatch 404 /*\.conf
 RedirectMatch 404 /*settings*
 RedirectMatch 404 /Makefile

 */
require('it-each')({ testPerIteration: true });
var http = require('http');
var expect = require('chai').expect;
var expectedDataFile = 'urls.json';
var urls = require(__dirname + '/../' + expectedDataFile);

describe('Asynchronous loop testing over ' + urls.list.length + ' URLs', function () {
    it.each(urls.list, 'expects %s from %s', ['expected', 'url'], function (url, nextUrl) {
        var expected = false;
        if (('undefined' === typeof url.url) || ('undefined' === typeof url.expected)) {
            throw new Error("If element is an Object in urls.json, it must contain 2 properties: 'url' and 'expected' with an HTTP status code.");
        }
        expected = url.expected;
        url = url.url;
        //console.log(url + " expects " + expected);
        http.get(url, function (res) {
            res.on('data', function() {
                //... Don't know why, but this help to handle 403 responses whitout timeout.
            });
            res.on('end', function() {
                expect(res.statusCode).to.equal(expected);
                nextUrl();
            });
        }).on('error', function(e) {
            console.log("Got error for " + url + ": " + e.message);
            nextUrl();
        });
    });
});