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 test = require('tape');
  var shims = require('../../builtin/_shims.js');
  var Buffer = require('buffer').Buffer;
  var R = require('stream').Readable;
  var util = require('util');
  
  util.inherits(TestReader, R);
  
  function TestReader(n, opts) {
    R.call(this, opts);
  
    this.pos = 0;
    this.len = n || 100;
  }
  
  TestReader.prototype._read = function(n) {
    setTimeout(shims.bind(function() {
  
      if (this.pos >= this.len) {
        // double push(null) to test eos handling
        this.push(null);
        return this.push(null);
      }
  
      n = Math.min(n, this.len - this.pos);
      if (n <= 0) {
        // double push(null) to test eos handling
        this.push(null);
        return this.push(null);
      }
  
      this.pos += n;
      var ret = new Buffer(n);
      ret.fill('a');
  
      return this.push(ret);
    }, this), 1);
  };
  
  test('setEncoding utf8', function(t) {
    var tr = new TestReader(100);
    tr.setEncoding('utf8');
    var out = [];
    var expect =
      [ 'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  
  test('setEncoding hex', function(t) {
    var tr = new TestReader(100);
    tr.setEncoding('hex');
    var out = [];
    var expect =
      [ '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  test('setEncoding hex with read(13)', function(t) {
    var tr = new TestReader(100);
    tr.setEncoding('hex');
    var out = [];
    var expect =
      [ "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "16161" ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(13)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  test('setEncoding base64', function(t) {
    var tr = new TestReader(100);
    tr.setEncoding('base64');
    var out = [];
    var expect =
      [ 'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYQ==' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  test('encoding: utf8', function(t) {
    var tr = new TestReader(100, { encoding: 'utf8' });
    var out = [];
    var expect =
      [ 'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa',
        'aaaaaaaaaa' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  
  test('encoding: hex', function(t) {
    var tr = new TestReader(100, { encoding: 'hex' });
    var out = [];
    var expect =
      [ '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161',
        '6161616161' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  test('encoding: hex with read(13)', function(t) {
    var tr = new TestReader(100, { encoding: 'hex' });
    var out = [];
    var expect =
      [ "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "1616161616161",
        "6161616161616",
        "16161" ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(13)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  
  test('encoding: base64', function(t) {
    var tr = new TestReader(100, { encoding: 'base64' });
    var out = [];
    var expect =
      [ 'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYWFhYWFh',
        'YWFhYWFhYW',
        'FhYQ==' ];
  
    tr.on('readable', function flow() {
      var chunk;
      while (null !== (chunk = tr.read(10)))
        out.push(chunk);
    });
  
    tr.on('end', function() {
      t.same(out, expect);
      t.end();
    });
  });
  