Come cacchio funziona!! Perchè complete non viene mai eseguito??

gistfile1.js

var async = require('async');

var functions = [];
 
functions.push(function(){ console.log("1"); return test1(1); });
functions.push(function(){ console.log("2"); return test1(2); });
functions.push(function(){ console.log("3"); return test1(3); });

async.parallel(functions, function(err, result){
    console.log('complete', result);
});

function test1 (value){
    return "hello " + value;
}

my 2c: passa la callback che va invocata dalle tue funzioni parallele:

var async = require('async');
var functions = [];

functions.push(function(callback){ setTimeout( function(){console.log("1"); callback(null,test1(1));}, 500 )});
functions.push(function(callback){ console.log("2"); callback(null,test1(2)); });
functions.push(function(callback){ console.log("3"); callback(null,test1(3)); });

async.parallel(functions, function(err, result){
    console.log('complete', result);
});

function test1 (value){
    return "hello " + value;
}