Test for https://github.com/nodejs/node/issues/5574

fixture.js

#!/usr/bin/env node
var Interface  = require('readline').Interface
var ReadStream = require('tty').ReadStream
var spawn      = require('child_process').spawn

Interface(process.stdin, process.stdout)

var stdin = ReadStream(process.stdin.fd)
process.stdin.pause()

var stdio = [stdin, process.stdout]

spawn('cat', [], {stdio: stdio})

test.js

#!/usr/bin/env node
var Readable = require('stream').Readable
var spawn    = require('child_process').spawn


const input = 'Habia una vez un circo que siempre alegraba el corazon'
const kpm = 240


var stdio = ['pipe', process.stdout, process.stderr]

var cp = spawn('./fixture.js', [], {stdio: stdio})

var stdin = new Readable()
    stdin._read = function(){}

stdin.pipe(cp.stdin)

var index = 0
function type()
{
  var data = input[index] || null

  stdin.push(data)
  index++

  if(data !== null) setTimeout(type, 60*1000/kpm)
}

type()