nodebb/test/mocks/newXhr.js

// see https://gist.github.com/jfromaniello/4087861#gistcomment-1447029
// XMLHttpRequest to override.
//var xhrPath = '../node_modules/socket.io-client/node_modules/engine.io-client/node_modules/xmlhttprequest';
var xhrPath = '../../node_modules/socket.io-client/node_modules/engine.io-client/node_modules/xmlhttprequest-ssl';
var name;
// Make initial call to require so module is cached.
try {
	require(xhrPath);
	name = require.resolve(xhrPath);
} catch (err) {
	console.log('err1', err);
	try {
		require('../../node_modules/xmlhttprequest-ssl');
		name = require.resolve('xmlhttprequest-ssl');
	} catch (err) {
		console.log('err2', err);
	}
}

console.log(name);
// Get cached version.
var cachedXhr = require.cache[name];
var stdXhr = cachedXhr.exports;

// Callbacks exposes an object that callback functions can be added to.
var callbacks = {};

var newXhr = function () {
	stdXhr.apply(this, arguments);
	for (var method in callbacks) {
		if (typeof callbacks[method] == "function") {
			callbacks[method].apply(this, arguments);
		}
	}
}

newXhr.XMLHttpRequest = newXhr;

cachedXhr.exports = newXhr;
module.exports = newXhr;
module.exports.callbacks = callbacks;