CodeSampleX

Exemplo

vitest 3.0.0: expect

Amostra verificada para npm vitest 3.0.0: expect. O contrato rodou em node 22 · linux debian/x64 · docker e passou: importing vitest without worker state in…

sha256:ca52aaa417a3e5d25da68af19bc0a094a384bcf77a8092e91677e091e16c4f84

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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…		 2026-09-08

Caso

HOW
Objetivo
verify expect in pkg:npm/vitest@3.0.0
Pacotes
Símbolos
  • expect
Ambiente
node 22.23.2
Criado
2026-09-08T16:26:17Z

Contrato

  1. importing vitest without worker state in standalone Node throws an Error with message starting with Vitest failed to access its internal state
  2. expect provides core value and identity matchers including toBe, toEqual, toStrictEqual, toBeDefined, and toBeTruthy
  3. expect toThrow asserts synchronous exceptions by error instance, constructor, or message pattern
  4. expect provides asynchronous promise matchers resolves and rejects for fulfilled and rejected promises
  5. expect.extend registers custom matchers that return pass status and error message generators
  6. expect.soft throws an Error stating it can only be used inside a test when executed outside a test runner context
  7. expect.unreachable throws an assertion failure with formatted unreachable error message
  8. expect.assertions and expect.hasAssertions record and validate expected assertion counts in test state
  9. expect provides asymmetric matchers including expect.any, expect.anything, and expect.stringContaining

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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 expect in pkg:npm/vitest@3.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vitest@3.0.0
Demonstrate these symbols/APIs:
  - expect
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: esm
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:a7bbc32cd07a270c496f0ecc087fe0844a7740ad8b4974fd3a4a58f8a6afdca3","constraints":{"executionContext":"node"},"contract":["importing vitest without worker state in standalone Node throws an Error with message starting with Vitest failed to access its internal state","expect provides core value and identity matchers including toBe, toEqual, toStrictEqual, toBeDefined, and toBeTruthy","expect toThrow asserts synchronous exceptions by error instance, constructor, or message pattern","expect provides asynchronous promise matchers resolves and rejects for fulfilled and rejected promises","expect.extend registers custom matchers that return pass status and error message generators","expect.soft throws an Error stating it can only be used inside a test when executed outside a test runner context","expect.unreachable throws an assertion failure with formatted unreachable error message","expect.assertions and expect.hasAssertions record and validate expected assertion counts in test state","expect provides asymmetric matchers including expect.any, expect.anything, and expect.stringContaining"],"goal":"verify expect in pkg:npm/vitest@3.0.0","kind":"HOW","packages":["pkg:npm/vitest@3.0.0"],"schemaVersion":1,"symbols":["expect"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","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@3.0.0"],"schemaVersion":1,"subject":"pkg:npm/vitest@3.0.0","symbols":["expect"],"verifierAdapter":"node-typescript@1"}
index.mjs
/**
 * Clean-room implementation demonstrating and wrapping `expect` from vitest@3.0.0.
 * In a standalone Node environment outside Vitest's test runner, importing Vitest
 * requires initializing internal worker state context.
 */

if (!globalThis.__vitest_worker__) {
  Object.defineProperty(globalThis, '__vitest_worker__', {
    value: {
      environment: { name: 'node' },
      config: {},
      filepath: 'contract.test.mjs',
    },
    configurable: true,
    writable: true,
    enumerable: false,
  });
}

const vitestModule = await import('vitest');
export const expect = vitestModule.expect;
export default vitestModule.expect;
package-lock.json
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      "resolved": "https://registry.npmjs.org/vitest/-/vitest-3.0.0.tgz",
      "integrity": "sha512-fwfPif+EV0jyms9h1Crb6rwJttH/KBzKrcUesjxHgldmc6R0FaMNLsd+Rgc17NoxzLcb/sYE2Xs9NQ/vnTBf6Q==",
      "license": "MIT",
      "dependencies": {
        "@vitest/expect": "3.0.0",
        "@vitest/mocker": "3.0.0",
        "@vitest/pretty-format": "^3.0.0",
        "@vitest/runner": "3.0.0",
        "@vitest/snapshot": "3.0.0",
        "@vitest/spy": "3.0.0",
        "@vitest/utils": "3.0.0",
        "chai": "^5.1.2",
        "debug": "^4.4.0",
        "expect-type": "^1.1.0",
        "magic-string": "^0.30.17",
        "pathe": "^2.0.0",
        "std-env": "^3.8.0",
        "tinybench": "^2.9.0",
        "tinyexec": "^0.3.2",
        "tinypool": "^1.0.2",
        "tinyrainbow": "^2.0.0",
        "vite": "^5.0.0 || ^6.0.0",
        "vite-node": "3.0.0",
        "why-is-node-running": "^2.3.0"
      },
      "bin": {
        "vitest": "vitest.mjs"
      },
      "engines": {
        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      },
      "peerDependencies": {
        "@edge-runtime/vm": "*",
        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
        "@vitest/browser": "3.0.0",
        "@vitest/ui": "3.0.0",
        "happy-dom": "*",
        "jsdom": "*"
      },
      "peerDependenciesMeta": {
        "@edge-runtime/vm": {
          "optional": true
        },
        "@types/node": {
          "optional": true
        },
        "@vitest/browser": {
          "optional": true
        },
        "@vitest/ui": {
          "optional": true
        },
        "happy-dom": {
          "optional": true
        },
        "jsdom": {
          "optional": true
        }
      }
    },
    "node_modules/why-is-node-running": {
      "version": "2.3.0",
      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
      "license": "MIT",
      "dependencies": {
        "siginfo": "^2.0.0",
        "stackback": "0.0.2"
      },
      "bin": {
        "why-is-node-running": "cli.js"
      },
      "engines": {
        "node": ">=8"
      }
    }
  }
}
package.json
{
  "name": "sample-vitest-expect",
  "version": "1.0.0",
  "description": "Clean-room verification of expect in vitest@3.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vitest": "3.0.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify expect in pkg:npm/vitest@3.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vitest@3.0.0"
  ],
  "symbols": [
    "expect"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "esm",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { spawnSync } from 'node:child_process';
import { fileURLToPath } from 'node:url';
import path from 'node:path';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const projectRoot = path.resolve(__dirname, '..');

// Contract 1: importing vitest without worker state in standalone Node throws an Error with message starting with Vitest failed to access its internal state
{
  const res = spawnSync(
    process.execPath,
    ['--input-type=module', '-e', 'import("vitest");'],
    {
      cwd: projectRoot,
      encoding: 'utf8',
    }
  );
  assert.notEqual(res.status, 0, 'Standalone import without worker state must fail');
  assert.match(
    res.stderr,
    /Vitest failed to access its internal state/,
    'Error message must indicate missing internal worker state'
  );
}

// Import expect via our clean-room module wrapper which ensures worker state initialization
const { expect } = await import('../index.mjs');

// Contract 2: expect provides core value and identity matchers including toBe, toEqual, toStrictEqual, toBeDefined, and toBeTruthy
{
  expect(42).toBe(42);
  expect({ a: 1 }).toEqual({ a: 1 });
  expect([1, 2]).toStrictEqual([1, 2]);
  expect('hello').toBeDefined();
  expect(true).toBeTruthy();
  expect(false).toBeFalsy();
}

// Contract 3: expect toThrow asserts synchronous exceptions by error instance, constructor, or message pattern
{
  expect(() => {
    throw new TypeError('invalid value');
  }).toThrow(TypeError);

  expect(() => {
    throw new Error('custom failure');
  }).toThrow('custom failure');

  expect(() => {
    throw new Error('regex match');
  }).toThrow(/regex/);
}

// Contract 4: expect provides asynchronous promise matchers resolves and rejects for fulfilled and rejected promises
{
  await expect(Promise.resolve({ status: 'ok' })).resolves.toEqual({
    status: 'ok',
  });
  await expect(Promise.reject(new Error('async rejection'))).rejects.toThrow(
    'async rejection'
  );
}

// Contract 5: expect.extend registers custom matchers that return pass status and error message generators
{
  expect.extend({
    toBeEven(received) {
      const pass = received % 2 === 0;
      return {
        pass,
        message: () => `expected ${received} to be an even number`,
      };
    },
  });

  expect(4).toBeEven();
  assert.throws(
    () => {
      expect(3).toBeEven();
    },
    /expected 3 to be an even number/
  );
}

// Contract 6: expect.soft throws an Error stating it can only be used inside a test when executed outside a test runner context
{
  assert.throws(
    () => {
      expect.soft(true).toBe(true);
    },
    /expect\.soft\(\) can only be used inside a test/
  );
}

// Contract 7: expect.unreachable throws an assertion failure with formatted unreachable error message
{
  assert.throws(
    () => {
      expect.unreachable('checkpoint A');
    },
    /expected "checkpoint A" not to be reached/
  );
}

// Contract 8: expect.assertions and expect.hasAssertions record and validate expected assertion counts in test state
{
  const stateBefore = expect.getState().assertionCalls;
  expect.assertions(stateBefore + 2);
  expect(1).toBe(1);
  expect(2).toBe(2);
  assert.equal(expect.getState().assertionCalls, stateBefore + 2);
  assert.equal(expect.getState().expectedAssertionsNumber, stateBefore + 2);

  expect.hasAssertions();
  assert.equal(expect.getState().isExpectingAssertions, true);
}

// Contract 9: expect provides asymmetric matchers including expect.any, expect.anything, and expect.stringContaining
{
  expect({ id: 101, name: 'vitest-suite', extra: 'present' }).toEqual({
    id: expect.any(Number),
    name: expect.stringContaining('vitest'),
    extra: expect.anything(),
  });
}

console.log('All 9 contract assertions passed successfully.');

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