Function test

test/parallel/test-stream-writev.js:47–120

(decode, uncork, multi, next)

}

function test(decode, uncork, multi, next) {
  console.log(`# decode=${decode} uncork=${uncork} multi=${multi}`);
  let counter = 0;
  let expectCount = 0;
  function cnt(msg) {
    expectCount++;
    const expect = expectCount;
    return common.mustSucceed(() => {
      counter++;
      assert.strictEqual(counter, expect);
    });
  }

  const w = new stream.Writable({ decodeStrings: decode });
  w._write = common.mustNotCall('Should not call _write');

  const expectChunks = decode ? [
    { encoding: 'buffer',
      chunk: [104, 101, 108, 108, 111, 44, 32] },
    { encoding: 'buffer',
      chunk: [119, 111, 114, 108, 100] },
    { encoding: 'buffer',
      chunk: [33] },
    { encoding: 'buffer',
      chunk: [10, 97, 110, 100, 32, 116, 104, 101, 110, 46, 46, 46] },
    { encoding: 'buffer',
      chunk: [250, 206, 190, 167, 222, 173, 190, 239, 222, 202, 251, 173] },
  ] : [
    { encoding: 'ascii', chunk: 'hello, ' },
    { encoding: 'utf8', chunk: 'world' },
    { encoding: 'buffer', chunk: [33] },
    { encoding: 'latin1', chunk: '\nand then...' },
    { encoding: 'hex', chunk: 'facebea7deadbeefdecafbad' },
  ];

  let actualChunks;
  w._writev = function(chunks, cb) {
    actualChunks = chunks.map(function(chunk) {
      return {
        encoding: chunk.encoding,
        chunk: Buffer.isBuffer(chunk.chunk) ?
          Array.prototype.slice.call(chunk.chunk) : chunk.chunk
      };
    });
    cb();
  };

  w.cork();
  w.write('hello, ', 'ascii', cnt('hello'));
  w.write('world', 'utf8', cnt('world'));

  if (multi)
    w.cork();

  w.write(Buffer.from('!'), 'buffer', cnt('!'));
  w.write('\nand then...', 'latin1', cnt('and then'));

  if (multi)