CodeSampleX

Ejemplo

vitest 4.1.11: expect

Muestra verificada para npm vitest 4.1.11: expect. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó: expect(received).toBe(expected)…

sha256:0f94e5072a79b9b90a9ec49e8f3e610f16cb29ab8a299b654759e250b7130e0f

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Caso

HOW
Objetivo
verify vitest.expect in pkg:npm/vitest@4.1.11
Paquetes
Símbolos
  • vitest.expect
Entorno
node 22.23.2
Creado
2026-08-28T08:30:42Z

Contrato

  1. expect(received).toBe(expected) asserts strict primitive equality and reference identity
  2. expect(received).toEqual(expected) asserts deep equality over nested objects and arrays
  3. expect(fn).toThrow(expected) captures errors and asserts exception messages or error instances
  4. expect.extend(customMatchers) registers custom assertion matchers returning pass status and message functions
  5. expect(promise).resolves and expect(promise).rejects unwrap async promises for chained assertions
  6. expect.assertions(count) verifies that the exact number of assertions were executed during a test
  7. expect.soft(received) performs assertions without immediately halting test execution upon failure

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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 vitest.expect in pkg:npm/vitest@4.1.11
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vitest@4.1.11
Demonstrate these symbols/APIs:
  - vitest.expect

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:a127b686961a9a56e402439f705853be70e3aa2a4ecd2aea97eb4b1212faf62a","contract":["expect(received).toBe(expected) asserts strict primitive equality and reference identity","expect(received).toEqual(expected) asserts deep equality over nested objects and arrays","expect(fn).toThrow(expected) captures errors and asserts exception messages or error instances","expect.extend(customMatchers) registers custom assertion matchers returning pass status and message functions","expect(promise).resolves and expect(promise).rejects unwrap async promises for chained assertions","expect.assertions(count) verifies that the exact number of assertions were executed during a test","expect.soft(received) performs assertions without immediately halting test execution upon failure"],"goal":"verify vitest.expect in pkg:npm/vitest@4.1.11","kind":"HOW","packages":["pkg:npm/vitest@4.1.11"],"schemaVersion":1,"symbols":["vitest.expect"]},"contractCommand":["node","test/contract.mjs"],"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/vitest@4.1.11"],"schemaVersion":1,"subject":"pkg:npm/vitest@4.1.11","symbols":["vitest.expect"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-vitest-expect",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "vitest": "4.1.11"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify vitest.expect in pkg:npm/vitest@4.1.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vitest@4.1.11"
  ],
  "symbols": [
    "vitest.expect"
  ]
}
src/index.mjs
import { expect } from 'vitest';

/**
 * Validates strict primitive equality and reference identity using expect.toBe.
 *
 * @param {unknown} received - The actual value.
 * @param {unknown} expected - The expected value.
 * @returns {boolean} True if assertion passes.
 */
export function validateStrictEquality(received, expected) {
  expect(received).toBe(expected);
  return true;
}

/**
 * Validates deep equality of objects or arrays using expect.toEqual.
 *
 * @param {unknown} received - The actual data.
 * @param {unknown} expected - The expected deep structure.
 * @returns {boolean} True if assertion passes.
 */
export function validateDeepEquality(received, expected) {
  expect(received).toEqual(expected);
  return true;
}

/**
 * Validates that a callback throws the expected error using expect.toThrow.
 *
 * @param {() => void} fn - Function to invoke.
 * @param {string | RegExp | ErrorConstructor} [expectedError] - Expected error message, pattern, or constructor.
 * @returns {boolean} True if assertion passes.
 */
export function validateThrows(fn, expectedError) {
  if (expectedError !== undefined) {
    expect(fn).toThrow(expectedError);
  } else {
    expect(fn).toThrow();
  }
  return true;
}

/**
 * Validates that a promise resolves to an expected value using expect.resolves.
 *
 * @param {Promise<unknown>} promise - The promise to check.
 * @param {unknown} expected - The expected resolved value.
 * @returns {Promise<boolean>} True if assertion passes.
 */
export async function validateResolves(promise, expected) {
  await expect(promise).resolves.toBe(expected);
  return true;
}

/**
 * Validates that a promise rejects with an expected error using expect.rejects.
 *
 * @param {Promise<unknown>} promise - The promise to check.
 * @param {string | RegExp | ErrorConstructor} expectedError - Expected error.
 * @returns {Promise<boolean>} True if assertion passes.
 */
export async function validateRejects(promise, expectedError) {
  await expect(promise).rejects.toThrow(expectedError);
  return true;
}

/**
 * Registers a custom matcher onto Vitest's expect instance.
 *
 * @param {string} matcherName - Name of the matcher.
 * @param {(received: unknown, ...args: unknown[]) => { pass: boolean; message: () => string }} matcherFn - Matcher implementation.
 */
export function registerCustomMatcher(matcherName, matcherFn) {
  expect.extend({
    [matcherName]: matcherFn,
  });
}

export { expect };
test/contract.mjs
import { startVitest } from 'vitest/node';

const vitest = await startVitest('test', ['test/contract.test.mjs'], {
  watch: false,
  run: true,
});

if (!vitest) {
  console.error('Failed to initialize vitest');
  process.exit(1);
}

const files = vitest.state.getFiles();
const allPassed = files.length > 0 && files.every(f => f.result?.state === 'pass');
await vitest.close();

if (!allPassed) {
  console.error('Vitest contract test failed');
  process.exit(1);
}

console.log('Contract test passed.');
test/contract.test.mjs
import { describe, it, expect } from 'vitest';
import {
  validateStrictEquality,
  validateDeepEquality,
  validateThrows,
  validateResolves,
  validateRejects,
  registerCustomMatcher,
} from '../src/index.mjs';

describe('vitest.expect', () => {
  it('expect(received).toBe(expected) asserts strict primitive equality and reference identity', () => {
    expect(42).toBe(42);
    expect('vitest').toBe('vitest');
    expect(true).toBe(true);

    const ref = { id: 10 };
    expect(ref).toBe(ref);
    expect({ id: 10 }).not.toBe(ref);

    expect(validateStrictEquality(100, 100)).toBe(true);
  });

  it('expect(received).toEqual(expected) asserts deep equality over nested objects and arrays', () => {
    const objA = { user: { name: 'Alice', roles: ['admin', 'viewer'] }, active: true };
    const objB = { user: { name: 'Alice', roles: ['admin', 'viewer'] }, active: true };

    expect(objA).toEqual(objB);
    expect([1, [2, 3]]).toEqual([1, [2, 3]]);
    expect(validateDeepEquality(objA, objB)).toBe(true);
  });

  it('expect(fn).toThrow(expected) captures errors and asserts exception messages or error instances', () => {
    const errorThrower = () => {
      throw new TypeError('Invalid input provided');
    };

    expect(errorThrower).toThrow();
    expect(errorThrower).toThrow(TypeError);
    expect(errorThrower).toThrow('Invalid input provided');
    expect(errorThrower).toThrow(/Invalid input/);
    expect(validateThrows(errorThrower, TypeError)).toBe(true);
  });

  it('expect.extend(customMatchers) registers custom assertion matchers returning pass status and message functions', () => {
    registerCustomMatcher('toBeEvenNumber', (received) => {
      const pass = typeof received === 'number' && received % 2 === 0;
      return {
        pass,
        message: () => `expected ${received} ${pass ? 'not ' : ''}to be an even number`,
      };
    });

    expect(4).toBeEvenNumber();
    expect(5).not.toBeEvenNumber();
  });

  it('expect(promise).resolves and expect(promise).rejects unwrap async promises for chained assertions', async () => {
    const successPromise = Promise.resolve('completed payload');
    const failurePromise = Promise.reject(new Error('async rejection reason'));

    await expect(successPromise).resolves.toBe('completed payload');
    await expect(failurePromise).rejects.toThrow('async rejection reason');

    await expect(validateResolves(Promise.resolve(999), 999)).resolves.toBe(true);
    await expect(validateRejects(Promise.reject(new Error('fail')), 'fail')).resolves.toBe(true);
  });

  it('expect.assertions(count) verifies that the exact number of assertions were executed during a test', () => {
    expect.assertions(3);

    expect(1 + 1).toBe(2);
    expect('foo').toEqual('foo');
    expect(true).toBeTruthy();
  });

  it('expect.soft(received) performs assertions without immediately halting test execution upon failure', () => {
    expect.soft(10).toBe(10);
    expect.soft('hello').toContain('ell');
    expect.soft({ status: 'ok' }).toEqual({ status: 'ok' });
  });
});

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