CodeSampleX

Beispiel

@jest/fake-timers 30.4.1: ModernFakeTimers

Verifiziertes Beispiel für npm @jest/fake-timers 30.4.1: ModernFakeTimers. Der Vertrag lief auf node 22 · linux debian/x64 · docker und bestand.

sha256:17f6cdc9b2092116c4d2db34fc569d7527dcbba8927ac1daf01617aa9787bab7

Dieses Netzwerk bietet eine Sache: ein Sample, das baut. Es hat es in einer Sandbox ausgeführt und die signierte Quittung behalten. Es bewertet nichts und garantiert nichts — ob derselbe Code bei Ihnen baut, hat es nicht gemessen. Wie viele verschiedene Signaturschlüssel eine bestandene Vertragsquittung eingereicht haben. Einer ist der Autor allein; mehr als einer heißt, jemand anderes hat es auch gebaut. Ein Schlüssel wird selbst erzeugt und hat keine registrierte Identität dahinter — gezählt werden Schlüssel, nicht Personen. MIT-0

Ausführungsbelege

Die deklarierte Umgebung und die signierten Läufe stehen getrennt, damit Sie genau sehen, was dieses Sample ausgeführt hat und wo.

Beleggrundlage
Signierter Vertrag bestanden
Verifizierungsbelege
1
Signaturschlüssel, die es gebaut haben
1
Deklarierte Umgebung node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Umgebungen der Verifizierungsläufe

Umgebung Contract Stufen Lauf
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-06

Fall

HOW
Ziel
verify @jest/fake-timers.ModernFakeTimers in pkg:npm/%40jest/fake-timers@30.4.1
Pakete
Symbole
  • @jest/fake-timers.ModernFakeTimers
Umgebung
node 22.23.2
Erstellt
2026-09-06T00:18:25Z

Contract

  1. ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers
  2. advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously
  3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks
  4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer
  5. runAllTimers and runAllTimersAsync exhaustively execute all queued and recursively scheduled timers
  6. runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers
  7. clearAllTimers and getTimerCount track and cancel active scheduled timers
  8. setSystemTime, now, and reset manage and simulate current timestamp
  9. runAllTicks executes queued microtasks and nextTick callbacks
  10. useFakeTimers accepts custom configuration options such as doNotFake and now
  11. dispose cleans up fake timers and restores real timers
  12. runWithFakeTime helper safely executes a scoped callback and restores native timers

Dateien

  • PROMPT.md
  • csx.json
  • index.mjs
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Quellartefakt herunterladen (tar.gz)

Quelltext

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify @jest/fake-timers.ModernFakeTimers in pkg:npm/%40jest/fake-timers@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/fake-timers@30.4.1
Demonstrate these symbols/APIs:
  - @jest/fake-timers.ModernFakeTimers

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:de1b4a16b2aeebd0ead7f3e426b025c4adbf66addbf720acba22d5ba084f61ae","contract":["ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers","advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously","advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks","advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer","runAllTimers and runAllTimersAsync exhaustively execute all queued and recursively scheduled timers","runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers","clearAllTimers and getTimerCount track and cancel active scheduled timers","setSystemTime, now, and reset manage and simulate current timestamp","runAllTicks executes queued microtasks and nextTick callbacks","useFakeTimers accepts custom configuration options such as doNotFake and now","dispose cleans up fake timers and restores real timers","runWithFakeTime helper safely executes a scoped callback and restores native timers"],"goal":"verify @jest/fake-timers.ModernFakeTimers in pkg:npm/%40jest/fake-timers@30.4.1","kind":"HOW","packages":["pkg:npm/%40jest/fake-timers@30.4.1"],"schemaVersion":1,"symbols":["@jest/fake-timers.ModernFakeTimers"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40jest/fake-timers@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/%40jest/fake-timers@30.4.1","symbols":["@jest/fake-timers.ModernFakeTimers"],"verifierAdapter":"node-typescript@1"}
index.mjs
import { ModernFakeTimers } from '@jest/fake-timers';

export { ModernFakeTimers };

export function createModernFakeTimers(options = {}) {
  const {
    global = globalThis,
    config = { rootDir: process.cwd() }
  } = options;
  return new ModernFakeTimers({ global, config });
}

export function runWithFakeTime(fn, options = {}) {
  const fakeTimers = createModernFakeTimers(options);
  fakeTimers.useFakeTimers(options.fakeTimersConfig);
  try {
    return fn(fakeTimers);
  } finally {
    fakeTimers.useRealTimers();
  }
}
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package.json
{
  "name": "sample-jest-fake-timers",
  "version": "1.0.0",
  "description": "Clean-room verification sample for @jest/fake-timers",
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@jest/fake-timers": "30.4.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @jest/fake-timers.ModernFakeTimers in pkg:npm/%40jest/fake-timers@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/fake-timers@30.4.1"
  ],
  "symbols": [
    "@jest/fake-timers.ModernFakeTimers"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import { ModernFakeTimers } from '@jest/fake-timers';
import { createModernFakeTimers, runWithFakeTime } from '../index.mjs';

// 1. ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers
{
  const originalSetTimeout = globalThis.setTimeout;
  const originalDate = globalThis.Date;
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  assert.notEqual(globalThis.setTimeout, originalSetTimeout);
  assert.notEqual(globalThis.Date, originalDate);
  fake.useRealTimers();
  assert.equal(globalThis.setTimeout, originalSetTimeout);
  assert.equal(globalThis.Date, originalDate);
}

// 2. advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const calls = [];
  setTimeout(() => { calls.push('a'); }, 250);
  setTimeout(() => { calls.push('b'); }, 500);

  fake.advanceTimersByTime(250);
  assert.deepEqual(calls, ['a']);

  fake.advanceTimersByTime(250);
  assert.deepEqual(calls, ['a', 'b']);
  fake.useRealTimers();
}

// 3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  let asyncFired = false;
  setTimeout(() => { asyncFired = true; }, 300);

  assert.equal(asyncFired, false);
  await fake.advanceTimersByTimeAsync(300);
  assert.equal(asyncFired, true);
  fake.useRealTimers();
}

// 4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const sequence = [];
  setTimeout(() => { sequence.push(1); }, 100);
  setTimeout(() => { sequence.push(2); }, 300);

  assert.equal(fake.getTimerCount(), 2);
  fake.advanceTimersToNextTimer();
  assert.deepEqual(sequence, [1]);
  assert.equal(fake.getTimerCount(), 1);

  await fake.advanceTimersToNextTimerAsync();
  assert.deepEqual(sequence, [1, 2]);
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 5. runAllTimers and runAllTimersAsync exhaustively execute all queued and recursively scheduled timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const executionOrder = [];
  setTimeout(() => {
    executionOrder.push('parent');
    setTimeout(() => {
      executionOrder.push('child');
    }, 50);
  }, 50);

  fake.runAllTimers();
  assert.deepEqual(executionOrder, ['parent', 'child']);
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 6. runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const results = [];
  setTimeout(() => {
    results.push('initial');
    setTimeout(() => {
      results.push('nested');
    }, 50);
  }, 50);

  fake.runOnlyPendingTimers();
  assert.deepEqual(results, ['initial']);
  assert.equal(fake.getTimerCount(), 1);

  fake.clearAllTimers();
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 7. clearAllTimers and getTimerCount track and cancel active scheduled timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  setTimeout(() => {}, 100);
  setTimeout(() => {}, 200);
  setInterval(() => {}, 300);

  assert.equal(fake.getTimerCount(), 3);
  fake.clearAllTimers();
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 8. setSystemTime, now, and reset manage and simulate current timestamp
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const epochTime = new Date('2026-09-01T12:00:00.000Z').getTime();
  fake.setSystemTime(epochTime);

  assert.equal(fake.now(), epochTime);
  assert.equal(Date.now(), epochTime);

  fake.reset();
  assert.equal(fake.now(), epochTime);
  fake.useRealTimers();
}

// 9. runAllTicks executes queued microtasks and nextTick callbacks
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  let tickRan = false;
  process.nextTick(() => { tickRan = true; });
  fake.runAllTicks();
  assert.equal(tickRan, true);
  fake.useRealTimers();
}

// 10. useFakeTimers accepts custom configuration options such as doNotFake and now
{
  const startTime = 1700000000000;
  const originalSetInterval = globalThis.setInterval;
  const fake = createModernFakeTimers();
  fake.useFakeTimers({
    now: startTime,
    doNotFake: ['setInterval']
  });
  assert.equal(fake.now(), startTime);
  assert.equal(globalThis.setInterval, originalSetInterval);
  fake.useRealTimers();
}

// 11. dispose cleans up fake timers and restores real timers
{
  const originalSetTimeout = globalThis.setTimeout;
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  assert.notEqual(globalThis.setTimeout, originalSetTimeout);
  fake.dispose();
  assert.equal(globalThis.setTimeout, originalSetTimeout);
}

// 12. runWithFakeTime helper safely executes a scoped callback and restores native timers
{
  const originalSetTimeout = globalThis.setTimeout;
  let executed = false;
  runWithFakeTime(fakeTimers => {
    assert.notEqual(globalThis.setTimeout, originalSetTimeout);
    setTimeout(() => { executed = true; }, 100);
    fakeTimers.runAllTimers();
    assert.equal(executed, true);
  });
  assert.equal(globalThis.setTimeout, originalSetTimeout);
}

console.log('All @jest/fake-timers ModernFakeTimers contract assertions passed.');

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