denoland-deno/cli/tests/node_compat/test/parallel/test-stream2-pipe-error-handling.js

// deno-fmt-ignore-file
// deno-lint-ignore-file

// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 18.12.1
// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.

// 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
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
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'use strict';
require('../common');
const assert = require('assert');
const stream = require('stream');

{
  let count = 1000;

  const source = new stream.Readable();
  source._read = function(n) {
    n = Math.min(count, n);
    count -= n;
    source.push(Buffer.allocUnsafe(n));
  };

  let unpipedDest;
  source.unpipe = function(dest) {
    unpipedDest = dest;
    stream.Readable.prototype.unpipe.call(this, dest);
  };

  const dest = new stream.Writable();
  dest._write = function(chunk, encoding, cb) {
    cb();
  };

  source.pipe(dest);

  let gotErr = null;
  dest.on('error', function(err) {
    gotErr = err;
  });

  let unpipedSource;
  dest.on('unpipe', function(src) {
    unpipedSource = src;
  });

  const err = new Error('This stream turned into bacon.');
  dest.emit('error', err);
  assert.strictEqual(gotErr, err);
  assert.strictEqual(unpipedSource, source);
  assert.strictEqual(unpipedDest, dest);
}

{
  let count = 1000;

  const source = new stream.Readable();
  source._read = function(n) {
    n = Math.min(count, n);
    count -= n;
    source.push(Buffer.allocUnsafe(n));
  };

  let unpipedDest;
  source.unpipe = function(dest) {
    unpipedDest = dest;
    stream.Readable.prototype.unpipe.call(this, dest);
  };

  const dest = new stream.Writable({ autoDestroy: false });
  dest._write = function(chunk, encoding, cb) {
    cb();
  };

  source.pipe(dest);

  let unpipedSource;
  dest.on('unpipe', function(src) {
    unpipedSource = src;
  });

  const err = new Error('This stream turned into bacon.');

  let gotErr = null;
  try {
    dest.emit('error', err);
  } catch (e) {
    gotErr = e;
  }
  assert.strictEqual(gotErr, err);
  assert.strictEqual(unpipedSource, source);
  assert.strictEqual(unpipedDest, dest);
}