test.js

'use strict';

var asyncWrap = process.binding('async_wrap');
var fs = require('fs');

var asyncHooksObject = {};
var kCallInitHook = 0;
asyncHooksObject[kCallInitHook] = 1;

//asyncHooksObject = new Uint8Array([1]);
//asyncHooksObject = new Buffer([1]);

asyncWrap.setupHooks(asyncHooksObject, init, before, after);

function init() {
  writeSync(JSON.stringify(arguments));
  writeSync('Init called');
}

function before() {
  writeSync(JSON.stringify(arguments));
  writeSync('Before called');
}

function after() {
  writeSync(JSON.stringify(arguments));
  writeSync('After called');
}

setTimeout(function () {
  writeSync('Callback called');
}, 15);

function writeSync(text) {
  fs.writeSync(1, text + '\n');
  fs.fsyncSync(1);
}