CodeSampleX

Exemple

jest-worker 29.7.0: FifoQueue

Échantillon vérifié pour npm jest-worker 29.7.0: FifoQueue. Le contrat s'est exécuté sur node 22 · linux debian/x64 · docker et a réussi.

sha256:d5c8b20a324fd6ccb353abb3de2e3ec94954c20eb9c5d192f00f2d08f90dc2ad

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
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…		 2026-09-05

Cas

HOW
Objectif
verify jest-worker.FifoQueue in pkg:npm/jest-worker@29.7.0
Paquets
Symboles
  • jest-worker.FifoQueue
Environnement
node 22.23.2
Créé
2026-09-05T19:10:48Z

Contrat

  1. FifoQueue returns null when attempting to dequeue from an empty queue or empty worker-specific queue
  2. FifoQueue enqueues and dequeues shared tasks in first-in-first-out order across different worker IDs
  3. FifoQueue isolates tasks assigned to specific worker IDs from other workers
  4. FifoQueue prioritizes pending shared tasks over worker-specific tasks when the prior shared task is unprocessed
  5. FifoQueue dequeues worker-specific tasks after their preceding shared tasks have been marked as processed

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code source

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-worker.FifoQueue in pkg:npm/jest-worker@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-worker@29.7.0
Demonstrate these symbols/APIs:
  - jest-worker.FifoQueue

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:c709bfc8f723f3edcf08550eafe22c6bef384e76fd9c77284aadc3d5008bcd0b","constraints":{"executionContext":"node"},"contract":["FifoQueue returns null when attempting to dequeue from an empty queue or empty worker-specific queue","FifoQueue enqueues and dequeues shared tasks in first-in-first-out order across different worker IDs","FifoQueue isolates tasks assigned to specific worker IDs from other workers","FifoQueue prioritizes pending shared tasks over worker-specific tasks when the prior shared task is unprocessed","FifoQueue dequeues worker-specific tasks after their preceding shared tasks have been marked as processed"],"goal":"verify jest-worker.FifoQueue in pkg:npm/jest-worker@29.7.0","kind":"HOW","packages":["pkg:npm/jest-worker@29.7.0"],"schemaVersion":1,"symbols":["jest-worker.FifoQueue"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/jest-worker@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/jest-worker@29.7.0","symbols":["jest-worker.FifoQueue"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const { FifoQueue } = require('jest-worker');

/**
 * Creates a new FifoQueue instance.
 * @returns {FifoQueue}
 */
function createFifoQueue() {
  return new FifoQueue();
}

/**
 * Creates a mock child message task object adhering to QueueChildMessage contract.
 * @param {string} methodName
 * @param {Array<unknown>} [args=[]]
 * @param {boolean} [isProcessed=false]
 * @returns {object}
 */
function createMockTask(methodName, args = [], isProcessed = false) {
  return {
    request: [1, isProcessed, methodName, args],
    onStart: () => {},
    onEnd: () => {},
    onCustomMessage: () => {}
  };
}

module.exports = {
  FifoQueue,
  createFifoQueue,
  createMockTask
};
package-lock.json
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package.json
{
  "name": "sample-jest-worker-fifoqueue-verify",
  "version": "1.0.0",
  "private": true,
  "description": "verify jest-worker.FifoQueue in pkg:npm/jest-worker@29.7.0",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "jest-worker": "29.7.0"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify jest-worker.FifoQueue in pkg:npm/jest-worker@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-worker@29.7.0"
  ],
  "symbols": [
    "jest-worker.FifoQueue"
  ]
}
test/contract.js
'use strict';

const assert = require('assert');
const { FifoQueue, createFifoQueue, createMockTask } = require('../index.js');

function testEmptyQueueReturnsNull() {
  const queue = createFifoQueue();
  assert.strictEqual(queue.dequeue(0), null, 'dequeue from empty queue should return null');
  assert.strictEqual(queue.dequeue(1), null, 'dequeue with different workerId from empty queue should return null');
}

function testSharedFifoOrdering() {
  const queue = createFifoQueue();
  const task1 = createMockTask('taskA', [1]);
  const task2 = createMockTask('taskB', [2]);
  const task3 = createMockTask('taskC', [3]);

  queue.enqueue(task1);
  queue.enqueue(task2);
  queue.enqueue(task3);

  assert.strictEqual(queue.dequeue(0), task1, 'first shared task dequeued by worker 0');
  assert.strictEqual(queue.dequeue(1), task2, 'second shared task dequeued by worker 1');
  assert.strictEqual(queue.dequeue(2), task3, 'third shared task dequeued by worker 2');
  assert.strictEqual(queue.dequeue(0), null, 'queue empty after all shared tasks dequeued');
}

function testWorkerSpecificIsolation() {
  const queue = createFifoQueue();
  const worker0Task = createMockTask('worker0Task', ['w0']);
  const worker1Task = createMockTask('worker1Task', ['w1']);

  queue.enqueue(worker0Task, 0);
  queue.enqueue(worker1Task, 1);

  // Worker 2 has no specific tasks and shared queue is empty -> returns null
  assert.strictEqual(queue.dequeue(2), null, 'worker 2 should receive null');

  // Worker 0 dequeues its task
  assert.strictEqual(queue.dequeue(0), worker0Task, 'worker 0 should receive its assigned task');
  assert.strictEqual(queue.dequeue(0), null, 'worker 0 queue should now be empty');

  // Worker 1 dequeues its task
  assert.strictEqual(queue.dequeue(1), worker1Task, 'worker 1 should receive its assigned task');
  assert.strictEqual(queue.dequeue(1), null, 'worker 1 queue should now be empty');
}

function testSharedTaskPrecedenceWhenUnprocessed() {
  const queue = createFifoQueue();
  const sharedTask = createMockTask('sharedTask', ['shared'], false);
  const workerTask = createMockTask('workerTask', ['worker0'], false);

  queue.enqueue(sharedTask); // shared queue
  queue.enqueue(workerTask, 0); // worker 0 queue; records previousSharedTask = sharedTask

  // Worker 0 dequeues: because sharedTask.request[1] is false, shared task has precedence
  const dequeued = queue.dequeue(0);
  assert.strictEqual(dequeued, sharedTask, 'unprocessed shared task must be dequeued before worker-specific task');

  // Worker 0 attempts to dequeue again: sharedTask was dequeued from shared queue, but not yet marked processed
  const dequeuedAgain = queue.dequeue(0);
  assert.strictEqual(dequeuedAgain, null, 'worker-specific task remains blocked until previous shared task is processed');
}

function testWorkerTaskDequeuedWhenPriorSharedProcessed() {
  const queue = createFifoQueue();
  const sharedTask = createMockTask('sharedTask', ['shared'], false);
  const workerTask = createMockTask('workerTask', ['worker0'], false);

  queue.enqueue(sharedTask);
  queue.enqueue(workerTask, 0);

  // Worker dequeues shared task
  const first = queue.dequeue(0);
  assert.strictEqual(first, sharedTask);

  // Mark shared task as completed/processed
  sharedTask.request[1] = true;

  // Now worker 0 should be unblocked and receive its worker-specific task
  const second = queue.dequeue(0);
  assert.strictEqual(second, workerTask, 'worker-specific task should be dequeued after prior shared task is processed');

  assert.strictEqual(queue.dequeue(0), null, 'queue should be empty');
}

function runAll() {
  testEmptyQueueReturnsNull();
  testSharedFifoOrdering();
  testWorkerSpecificIsolation();
  testSharedTaskPrecedenceWhenUnprocessed();
  testWorkerTaskDequeuedWhenPriorSharedProcessed();

  console.log('Contract tests passed successfully.');
}

runAll();

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