text: // 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';
  const common = require('../common');
  const fs = require('fs');
  const assert = require('assert');
  const join = require('path').join;
  
  const filename = join(common.tmpDir, 'out.txt');
  
  common.refreshTmpDir();
  
  const fd = fs.openSync(filename, 'w');
  
  const line = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaa\n';
  
  const N = 10240;
  let complete = 0;
  
  for (let i = 0; i < N; i++) {
    // Create a new buffer for each write. Before the write is actually
    // executed by the thread pool, the buffer will be collected.
    const buffer = Buffer.from(line);
    fs.write(fd, buffer, 0, buffer.length, null, function(er, written) {
      complete++;
      if (complete === N) {
        fs.closeSync(fd);
        const s = fs.createReadStream(filename);
        s.on('data', testBuffer);
      }
    });
  }
  
  let bytesChecked = 0;
  
  function testBuffer(b) {
    for (let i = 0; i < b.length; i++) {
      bytesChecked++;
      if (b[i] !== 'a'.charCodeAt(0) && b[i] !== '\n'.charCodeAt(0)) {
        throw new Error(`invalid char ${i},${b[i]}`);
      }
    }
  }
  
  process.on('exit', function() {
    // Probably some of the writes are going to overlap, so we can't assume
    // that we get (N * line.length). Let's just make sure we've checked a
    // few...
    assert.ok(bytesChecked > 1000);
  });
  