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.
  
  var common = require('../common');
  var assert = require('assert');
  
  var Stream = require('../../');
  var Readable = require('../../').Readable;
  
  var r = new Readable();
  var N = 256;
  var reads = 0;
  r._read = function(n) {
    return r.push(++reads === N ? null : new Buffer(1));
  };
  
  var rended = false;
  r.on('end', function() {
    rended = true;
  });
  
  var w = new Stream();
  w.writable = true;
  var writes = 0;
  var buffered = 0;
  w.write = function(c) {
    writes += c.length;
    buffered += c.length;
    process.nextTick(drain);
    return false;
  };
  
  function drain() {
    assert(buffered <= 2);
    buffered = 0;
    w.emit('drain');
  }
  
  
  var wended = false;
  w.end = function() {
    wended = true;
  };
  
  // Just for kicks, let's mess with the drain count.
  // This verifies that even if it gets negative in the
  // pipe() cleanup function, we'll still function properly.
  r.on('readable', function() {
    w.emit('drain');
  });
  
  r.pipe(w);
  process.on('exit', function() {
    assert(rended);
    assert(wended);
    console.error('ok');
  });
  