CodeSampleX

Exemple

jest-mock 29.7.0: fn

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

sha256:c3118cb3f4faa866d15da3d2999b2e580e5c5b4bdc9b892fd57fe4b4cd66ce39

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…		 2026-09-06

Cas

HOW
Objectif
verify jest-mock.fn in pkg:npm/jest-mock@29.7.0
Paquets
Symboles
  • jest-mock.fn
Environnement
node 22.23.2
Créé
2026-09-06T07:53:28Z

Contrat

  1. fn creates a mock function that defaults to returning undefined and tracks call count and arguments
  2. fn records mock.calls, mock.results with return type, and mock.contexts for each invocation
  3. mockReturnValue and mockReturnValueOnce configure synchronous return values with once taking precedence
  4. mockResolvedValue and mockResolvedValueOnce return promises resolving to the configured values
  5. mockRejectedValue and mockRejectedValueOnce return promises rejecting with the configured errors
  6. mockImplementation and mockImplementationOnce override mock execution behavior sequentially
  7. mockReturnThis binds the returned value to the execution this context
  8. mockClear clears recorded calls and results while preserving current mock implementation
  9. mockReset clears recorded calls and resets implementation to return undefined
  10. withImplementation temporarily overrides mock implementation for the duration of a callback

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-mock.fn in pkg:npm/jest-mock@29.7.0
Kind: HOW

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

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:sha256:3e202a7070bf30aa087035d08a25b597461e31832c7801d94ca31210e7643435","contract":["fn creates a mock function that defaults to returning undefined and tracks call count and arguments","fn records mock.calls, mock.results with return type, and mock.contexts for each invocation","mockReturnValue and mockReturnValueOnce configure synchronous return values with once taking precedence","mockResolvedValue and mockResolvedValueOnce return promises resolving to the configured values","mockRejectedValue and mockRejectedValueOnce return promises rejecting with the configured errors","mockImplementation and mockImplementationOnce override mock execution behavior sequentially","mockReturnThis binds the returned value to the execution this context","mockClear clears recorded calls and results while preserving current mock implementation","mockReset clears recorded calls and resets implementation to return undefined","withImplementation temporarily overrides mock implementation for the duration of a callback"],"goal":"verify jest-mock.fn in pkg:npm/jest-mock@29.7.0","kind":"HOW","packages":["pkg:npm/jest-mock@29.7.0"],"schemaVersion":1,"symbols":["jest-mock.fn"]},"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-mock@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/jest-mock@29.7.0","symbols":["jest-mock.fn"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const jestMock = require('jest-mock');
const { fn } = jestMock;

/**
 * Creates a mock function with an optional implementation.
 * @param {Function} [implementation]
 * @returns {Function}
 */
function createMockFunction(implementation) {
  return fn(implementation);
}

/**
 * Creates an async mock function that resolves to the specified value.
 * @param {*} resolvedValue
 * @returns {Function}
 */
function createAsyncMock(resolvedValue) {
  const mock = fn();
  mock.mockResolvedValue(resolvedValue);
  return mock;
}

/**
 * Creates an async mock function that rejects with the specified reason.
 * @param {*} rejectionReason
 * @returns {Function}
 */
function createRejectingMock(rejectionReason) {
  const mock = fn();
  mock.mockRejectedValue(rejectionReason);
  return mock;
}

/**
 * Creates a mock function configured to return a sequence of values once,
 * then fall back to a default value.
 * @param {Array<*>} sequence
 * @param {*} [defaultValue]
 * @returns {Function}
 */
function createSequenceMock(sequence, defaultValue) {
  const mock = fn();
  if (defaultValue !== undefined) {
    mock.mockReturnValue(defaultValue);
  }
  for (const val of sequence) {
    mock.mockReturnValueOnce(val);
  }
  return mock;
}

/**
 * Creates a mock function that returns its `this` execution context.
 * @returns {Function}
 */
function createChainableMock() {
  const mock = fn();
  mock.mockReturnThis();
  return mock;
}

/**
 * Extracts metadata and call history from a mock function.
 * @param {Function} mockFn
 * @returns {object}
 */
function inspectMock(mockFn) {
  return {
    name: mockFn.getMockName(),
    callCount: mockFn.mock.calls.length,
    calls: [...mockFn.mock.calls],
    results: [...mockFn.mock.results],
    lastCall: mockFn.mock.lastCall
  };
}

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

const assert = require('assert');
const {
  fn,
  createMockFunction,
  createAsyncMock,
  createRejectingMock,
  createSequenceMock,
  createChainableMock,
  inspectMock
} = require('../index.js');

function testDefaultMockBehavior() {
  const mock = fn();
  assert.strictEqual(mock.getMockName(), 'jest.fn()');

  const result = mock('firstArg', 42);
  assert.strictEqual(result, undefined, 'default mock must return undefined');
  assert.strictEqual(mock.mock.calls.length, 1, 'call count must be 1');
  assert.deepStrictEqual(mock.mock.calls[0], ['firstArg', 42]);
  assert.deepStrictEqual(mock.mock.lastCall, ['firstArg', 42]);
}

function testInvocationRecordsAndContext() {
  const contextObj = { scope: 'test-scope' };
  const mock = fn(function (factor) {
    return factor * 10;
  });

  const returnedVal = mock.call(contextObj, 5);
  assert.strictEqual(returnedVal, 50);
  assert.strictEqual(mock.mock.calls.length, 1);
  assert.deepStrictEqual(mock.mock.calls[0], [5]);
  assert.strictEqual(mock.mock.contexts[0], contextObj);
  assert.strictEqual(mock.mock.results.length, 1);
  assert.strictEqual(mock.mock.results[0].type, 'return');
  assert.strictEqual(mock.mock.results[0].value, 50);

  const errorMock = fn(() => {
    throw new Error('intentional failure');
  });

  assert.throws(() => errorMock(), /intentional failure/);
  assert.strictEqual(errorMock.mock.results[0].type, 'throw');
  assert.strictEqual(errorMock.mock.results[0].value.message, 'intentional failure');
}

function testReturnValuesConfiguration() {
  const mock = fn();
  mock.mockReturnValue('fallback');
  mock.mockReturnValueOnce('one');
  mock.mockReturnValueOnce('two');

  assert.strictEqual(mock(), 'one');
  assert.strictEqual(mock(), 'two');
  assert.strictEqual(mock(), 'fallback');
  assert.strictEqual(mock(), 'fallback');
}

async function testAsyncResolvedValues() {
  const mock = fn();
  mock.mockResolvedValue('default-async');
  mock.mockResolvedValueOnce('first-async');

  const res1 = await mock();
  assert.strictEqual(res1, 'first-async');

  const res2 = await mock();
  assert.strictEqual(res2, 'default-async');

  const helperMock = createAsyncMock('helper-async');
  const helperRes = await helperMock();
  assert.strictEqual(helperRes, 'helper-async');
}

async function testAsyncRejectedValues() {
  const mock = fn();
  mock.mockRejectedValue(new Error('default-async-error'));
  mock.mockRejectedValueOnce(new Error('first-async-error'));

  await assert.rejects(async () => {
    await mock();
  }, {
    name: 'Error',
    message: 'first-async-error'
  });

  await assert.rejects(async () => {
    await mock();
  }, {
    name: 'Error',
    message: 'default-async-error'
  });

  const rejectingHelper = createRejectingMock(new Error('helper-reject'));
  await assert.rejects(async () => {
    await rejectingHelper();
  }, {
    name: 'Error',
    message: 'helper-reject'
  });
}

function testImplementationChaining() {
  const mock = fn(() => 'base');
  mock.mockImplementationOnce(() => 'temp1');
  mock.mockImplementationOnce(() => 'temp2');
  mock.mockImplementation((x) => `custom-${x}`);

  assert.strictEqual(mock('a'), 'temp1');
  assert.strictEqual(mock('b'), 'temp2');
  assert.strictEqual(mock('c'), 'custom-c');
  assert.strictEqual(mock('d'), 'custom-d');
}

function testMockReturnThis() {
  const mock = fn();
  mock.mockReturnThis();

  const receiver = {
    action: mock
  };

  const chained = receiver.action();
  assert.strictEqual(chained, receiver, 'mockReturnThis must return the execution context');

  const helperChain = createChainableMock();
  const host = { chain: helperChain };
  assert.strictEqual(host.chain(), host);
}

function testMockClear() {
  const mock = fn((val) => val * 3);
  assert.strictEqual(mock(4), 12);
  assert.strictEqual(mock.mock.calls.length, 1);
  assert.strictEqual(mock.mock.results.length, 1);

  mock.mockClear();

  assert.strictEqual(mock.mock.calls.length, 0);
  assert.strictEqual(mock.mock.results.length, 0);
  assert.strictEqual(mock.mock.instances.length, 0);
  assert.strictEqual(mock.mock.contexts.length, 0);

  // Implementation remains intact
  assert.strictEqual(mock(5), 15);
  assert.strictEqual(mock.mock.calls.length, 1);
}

function testMockReset() {
  const mock = fn((val) => val * 3);
  assert.strictEqual(mock(4), 12);

  mock.mockReset();

  assert.strictEqual(mock.mock.calls.length, 0);
  assert.strictEqual(mock.mock.results.length, 0);
  // Implementation reset to empty function returning undefined
  assert.strictEqual(mock(5), undefined);
}

function testWithImplementation() {
  const mock = fn(() => 'original');
  let innerResult;

  mock.withImplementation(() => 'override', () => {
    innerResult = mock();
  });

  assert.strictEqual(innerResult, 'override');
  assert.strictEqual(mock(), 'original');
}

function testSequenceAndInspectHelpers() {
  const sequenceMock = createSequenceMock(['alpha', 'beta'], 'omega');
  assert.strictEqual(sequenceMock(), 'alpha');
  assert.strictEqual(sequenceMock(), 'beta');
  assert.strictEqual(sequenceMock(), 'omega');
  assert.strictEqual(sequenceMock(), 'omega');

  const customNamed = createMockFunction();
  customNamed.mockName('inspectedMock');
  customNamed('arg1', 'arg2');

  const stats = inspectMock(customNamed);
  assert.strictEqual(stats.name, 'inspectedMock');
  assert.strictEqual(stats.callCount, 1);
  assert.deepStrictEqual(stats.calls, [['arg1', 'arg2']]);
  assert.deepStrictEqual(stats.lastCall, ['arg1', 'arg2']);
  assert.strictEqual(stats.results[0].type, 'return');
}

async function runAll() {
  testDefaultMockBehavior();
  testInvocationRecordsAndContext();
  testReturnValuesConfiguration();
  await testAsyncResolvedValues();
  await testAsyncRejectedValues();
  testImplementationChaining();
  testMockReturnThis();
  testMockClear();
  testMockReset();
  testWithImplementation();
  testSequenceAndInspectHelpers();

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

runAll().catch((err) => {
  console.error('Contract test failure:', err);
  process.exit(1);
});

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