xref: /third_party/node/test/parallel/test-stream2-unpipe-drain.js (revision 1cb0ef41)

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';
require('../common');
const assert = require('assert');

const stream = require('stream');

class TestWriter extends stream.Writable {
  _write(buffer, encoding, callback) {
    console.log('write called');
    // Super slow write stream (callback never called)
  }
}

const dest = new TestWriter();

class TestReader extends stream.Readable {
  constructor() {
    super();
    this.reads = 0;
  }

  _read(size) {
    this.reads += 1;
    this.push(Buffer.alloc(size));
  }
}

const src1 = new TestReader();
const src2 = new TestReader();

src1.pipe(dest);

src1.once('readable', () => {
  process.nextTick(() => {

    src2.pipe(dest);

    src2.once('readable', () => {
      process.nextTick(() => {

        src1.unpipe(dest);
      });
    });
  });
});


process.on('exit', () => {
  assert.strictEqual(src1.reads, 2);
  assert.strictEqual(src2.reads, 2);
});