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denoland-deno/tests/node_compat/test/parallel/test-next-tick-fixed-queue-regression.js

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// deno-fmt-ignore-file
// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 20.11.1
// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.
'use strict';
const common = require('../common');
// This tests a highly specific regression tied to the FixedQueue size, which
// was introduced in Node.js 9.7.0: https://github.com/nodejs/node/pull/18617
// More specifically, a nextTick list could potentially end up not fully
// clearing in one run through if exactly 2048 ticks were added after
// microtasks were executed within the nextTick loop.
process.nextTick(() => {
Promise.resolve(1).then(() => {
for (let i = 0; i < 2047; i++)
process.nextTick(common.mustCall());
const immediate = setImmediate(common.mustNotCall());
process.nextTick(common.mustCall(() => clearImmediate(immediate)));
});
});