denoland-deno/tests/node_compat/test/parallel/test-buffer-parent-property.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.

'use strict';

// Fix for https://github.com/nodejs/node/issues/8266
//
// Zero length Buffer objects should expose the `buffer` property of the
// TypedArrays, via the `parent` property.
require('../common');
const assert = require('assert');

// If the length of the buffer object is zero
assert((new Buffer(0)).parent instanceof ArrayBuffer);

// If the length of the buffer object is equal to the underlying ArrayBuffer
assert((new Buffer(Buffer.poolSize)).parent instanceof ArrayBuffer);

// Same as the previous test, but with user created buffer
const arrayBuffer = new ArrayBuffer(0);
assert.strictEqual(new Buffer(arrayBuffer).parent, arrayBuffer);
assert.strictEqual(new Buffer(arrayBuffer).buffer, arrayBuffer);
assert.strictEqual(Buffer.from(arrayBuffer).parent, arrayBuffer);
assert.strictEqual(Buffer.from(arrayBuffer).buffer, arrayBuffer);