1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23const common = require('../common'); 24const assert = require('assert'); 25const { Readable, Writable } = require('stream'); 26 27class TestReadable extends Readable { 28 constructor(opt) { 29 super(opt); 30 this._ended = false; 31 } 32 33 _read() { 34 if (this._ended) 35 this.emit('error', new Error('_read called twice')); 36 this._ended = true; 37 this.push(null); 38 } 39} 40 41class TestWritable extends Writable { 42 constructor(opt) { 43 super(opt); 44 this._written = []; 45 } 46 47 _write(chunk, encoding, cb) { 48 this._written.push(chunk); 49 cb(); 50 } 51} 52 53// This one should not emit 'end' until we read() from it later. 54const ender = new TestReadable(); 55 56// What happens when you pipe() a Readable that's already ended? 57const piper = new TestReadable(); 58// pushes EOF null, and length=0, so this will trigger 'end' 59piper.read(); 60 61setTimeout(common.mustCall(function() { 62 ender.on('end', common.mustCall()); 63 const c = ender.read(); 64 assert.strictEqual(c, null); 65 66 const w = new TestWritable(); 67 w.on('finish', common.mustCall()); 68 piper.pipe(w); 69}), 1); 70