'use strict'; const common = require('../common'); const assert = require('assert'); const fs = require('fs'); const FSReadable = fs.ReadStream; const path = require('path'); const file = path.resolve(common.fixturesDir, 'x1024.txt'); const size = fs.statSync(file).size; const expectLengths = [1024]; const util = require('util'); const Stream = require('stream'); util.inherits(TestWriter, Stream); function TestWriter() { Stream.apply(this); this.buffer = []; this.length = 0; } TestWriter.prototype.write = function(c) { this.buffer.push(c.toString()); this.length += c.length; return true; }; TestWriter.prototype.end = function(c) { if (c) this.buffer.push(c.toString()); this.emit('results', this.buffer); }; const r = new FSReadable(file); const w = new TestWriter(); w.on('results', function(res) { console.error(res, w.length); assert.strictEqual(w.length, size); assert.deepStrictEqual(res.map(function(c) { return c.length; }), expectLengths); console.log('ok'); }); r.pipe(w);