问如何使用节点做基本测试？

//
// RUN WITH AND WITHOUT THIS
//
"use strict";

var assert = require('assert');

var slice = [].slice;

function thunkify_fast(fn){
  assert('function' == typeof fn, 'function required');

  return function(){
    var args = new Array(arguments.length);
    for(var i = 0; i < args.length; ++i) {
      args[i] = arguments[i];
    }
    var ctx = this;

    return function(done){
      var called;

      args.push(function(){
        if (called) return;
        called = true;
        done.apply(null, arguments);
      });

      try {
        fn.apply(ctx, args);
      } catch (err) {
        done(err);
      }
    }
  }
};

function thunkify_slow(fn){
  assert('function' == typeof fn, 'function required');

  return function(){
    var args = slice.call(arguments);
    var ctx = this;

    return function(done){
      var called;

      args.push(function(){
        if (called) return;
        called = true;
        done.apply(null, arguments);
      });

      try {
        fn.apply(ctx, args);
      } catch (err) {
        done(err);
      }
    }
  }
};


var fn = function () { };

var Benchmark = require('benchmark');
var suite = new Benchmark.Suite;


//
// Only one wrapper can be sent through the optimized compiler
//
suite.add( 'thunkify#fast', function () { thunkify_fast(fn)(function(){}) } )
    .add( 'thunkify#slow', function () { thunkify_slow(fn)(function(){}) } )
    .on('cycle', function(event) { console.log(String(event.target)); })
    .on('complete', function() {
        console.log('Fastest is ' + this.filter('fastest').pluck('name'));
    })
    .run();

$ node --allow-natives-syntax test.js 
thunkify#fast x 8,511,605 ops/sec ±1.22% (95 runs sampled)
thunkify#slow x 4,579,633 ops/sec ±0.68% (96 runs sampled)
Fastest is thunkify#fast

$ node --allow-natives-syntax test.js 
thunkify#fast x 9,372,375 ops/sec ±0.45% (100 runs sampled)
thunkify#slow x 1,483,664 ops/sec ±0.93% (96 runs sampled)
Fastest is thunkify#fast

var f_fast = thunkify_fast(fn);
var f_slow = thunkify_slow(fn);
suite.add( 'thunkify#fast', function () { f_fast(function(){}) } )
  .add( 'thunkify#slow', function () { f_slow(function(){}) } )
  .on('cycle', function(event) { console.log(String(event.target)); })
  .on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').pluck('name'));
  })
  .run();

thunkify#fast x 18,910,556 ops/sec ±0.61% (100 runs sampled)
thunkify#slow x 5,148,036 ops/sec ±0.40% (100 runs sampled)

thunkify#fast x 19,485,652 ops/sec ±1.27% (99 runs sampled)
thunkify#slow x 1,608,235 ops/sec ±3.37% (93 runs sampled)