CodeSampleX

サンプル

vitest 3.0.0: expect

検証済みサンプル — npm vitest 3.0.0: expect. node 22 · linux debian/x64 · docker で contract を実行し、成功しました: importing vitest without worker state in standalone Node…

sha256:ca52aaa417a3e5d25da68af19bc0a094a384bcf77a8092e91677e091e16c4f84

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
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

ケース

HOW
ゴール
verify expect in pkg:npm/vitest@3.0.0
パッケージ
シンボル
  • expect
環境
node 22.23.2
作成日
2026-09-08T16:26:17Z

コントラクト

  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

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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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        "pathe": "^2.0.0",
        "vite": "^5.0.0 || ^6.0.0"
      },
      "bin": {
        "vite-node": "vite-node.mjs"
      },
      "engines": {
        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/vitest": {
      "version": "3.0.0",
      "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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