Q promises concurrency test

concurrent.js

var Q = require('q');
var debug = require('debug')('test');

var func1 = function() {
    return Q.promise(function(resolve, reject) {
        setTimeout(function() {
            debug('concurrent func1?');
            resolve(1);
        }, 4000);
    });
};

var func2 = function() {
    return Q.promise(function(resolve, reject) {
        setTimeout(function() {
            debug('concurrent func2?');
            resolve(2);
        }, 2000);
    });
};

var func3 = function() {
    return Q.promise(function(resolve, reject) {
        setTimeout(function() {
            debug('sequential func3?');
            resolve(3);
        }, 7000);
    });
};

Q.all([
    func1().then(function (fvalue) {
        debug('done with one');
        return func3().then(function (value) {
            return fvalue + value;
        });
    }),
    func2()
]).then(function(response) {
    debug('done concurrent');
    debug(response);
    return response;
})
.fin(function() {
    debug('finally');
})
.done(function success(argument) {
    debug('success', argument);
    return argument;
}, function (error) {
    debug('error :', error)
});