node_modules/through/test/async.js

var from = require('from')

var through = require('../')

var tape = require('tape')

tape('simple async example', function (t) {

  var n = 0, expected = [1,2,3,4,5], actual = []

  from(expected)

  .pipe(through(function(data) {

    this.pause()

    n ++

    setTimeout(function(){

      console.log('pushing data', data)

      this.push(data)

      this.resume()

    }.bind(this), 300)

  })).pipe(through(function(data) {

    console.log('pushing data second time', data);

    this.push(data)

  })).on('data', function (d) {

    actual.push(d)

  }).on('end', function() {

    t.deepEqual(actual, expected)

    t.end()

  })

})