slowly write random data to file

writeData.js

    var dataTotal = 5242880 // 5 meg
    var filePath = path.join(process.cwd, 'test', 'testData')
    var randomData = function() {
      return String(Math.round(Math.random()))
    }

    var stream = fs.createWriteStream(filePath)
    stream.on('close', function() {
      done()
    })

    var dataSize = 0
    stream.on('open', function() {
      while(dataSize < dataTotal) {
        dataSize++
        var data = randomData()
        stream.write(data, 'binary')
        if (dataSize >= dataTotal) {
          stream.end()
          stream.destroySoon()
        }
      }
    })