CodeSampleX

サンプル

vitest 4.1.11: expect

検証済みサンプル — npm vitest 4.1.11: expect. node 22 · linux alpine/x64 · docker で contract を実行し、成功しました: expect(received).toBe(expected) asserts strict primitive…

sha256:0f94e5072a79b9b90a9ec49e8f3e610f16cb29ab8a299b654759e250b7130e0f

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 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

ケース

HOW
ゴール
verify vitest.expect in pkg:npm/vitest@4.1.11
パッケージ
シンボル
  • vitest.expect
環境
node 22.23.2
作成日
2026-08-28T08:30:42Z

コントラクト

  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

ファイル

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