CodeSampleX

Exemple

vitest 3.2.7: vi

Échantillon vérifié pour npm vitest 3.2.7: vi. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi : vi.fn creates mock functions…

sha256:85bc8b5d64e114c91d8d3da09ed277cfb94c68c86c4beb7de5ef952fa9bbf145

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 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

Cas

HOW
Objectif
verify vitest.vi in pkg:npm/vitest@3.2.7
Paquets
Symboles
  • vitest.vi
Environnement
node 22.23.2
Créé
2026-08-28T04:44:31Z

Contrat

  1. vi.fn creates mock functions that track call history, arguments, and return values
  2. vi.spyOn observes and replaces object methods and supports restoring original implementations
  3. vi.useFakeTimers and vi.advanceTimersByTime manipulate timer execution and intervals deterministically
  4. vi.setSystemTime overrides the global Date and system clock for time-dependent testing
  5. vi.waitFor polls asynchronous operations until assertions pass or timeout occurs

Fichiers

  • PROMPT.md
  • README.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/service.js
  • test/contract.mjs
  • test/vi-features.test.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 vitest.vi in pkg:npm/vitest@3.2.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vitest@3.2.7
Demonstrate these symbols/APIs:
  - vitest.vi
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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.
README.md
# Vitest `vi` Utility Code Sample

This sample demonstrates Vitest's `vi` mocking and utility suite in `vitest@3.2.7`.

## Features Demonstrated

- **`vi.fn()`**: Creates mock functions to spy on calls, inspect argument history, and mock return values.
- **`vi.spyOn()`**: Wraps and spies on object methods with support for implementation replacement and restoring original functionality via `mockRestore()`.
- **`vi.useFakeTimers()` & `vi.advanceTimersByTime()`**: Deterministically controls timer execution for timeouts and intervals.
- **`vi.setSystemTime()`**: Overrides system clock and `Date` for time-dependent unit testing.
- **`vi.waitFor()`**: Polls asynchronous functions until assertions succeed or timeout triggers.

## Running Contract Verification

```bash
npm test
```
csx.json
{"case":{"caseId":"case:sha256:e5655724f29da4f5acab8a9482d812f42f2e7f502de1d1500f3bc9f16c178e7c","constraints":{"executionContext":"node"},"contract":["vi.fn creates mock functions that track call history, arguments, and return values","vi.spyOn observes and replaces object methods and supports restoring original implementations","vi.useFakeTimers and vi.advanceTimersByTime manipulate timer execution and intervals deterministically","vi.setSystemTime overrides the global Date and system clock for time-dependent testing","vi.waitFor polls asynchronous operations until assertions pass or timeout occurs"],"goal":"verify vitest.vi in pkg:npm/vitest@3.2.7","kind":"HOW","packages":["pkg:npm/vitest@3.2.7"],"schemaVersion":1,"symbols":["vitest.vi"]},"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@3.2.7"],"schemaVersion":1,"subject":"pkg:npm/vitest@3.2.7","symbols":["vitest.vi"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "vitest-vi-sample",
  "version": "1.0.0",
  "license": "MIT-0",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vitest": "3.2.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify vitest.vi in pkg:npm/vitest@3.2.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vitest@3.2.7"
  ],
  "symbols": [
    "vitest.vi"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/service.js
/**
 * Service functions demonstrating patterns tested with vitest.vi
 */

export function processPayment(paymentGateway, order) {
  if (!order || typeof order.amount !== 'number') {
    throw new Error('Invalid order: amount must be a number');
  }
  return paymentGateway.charge(order.id, order.amount);
}

export function scheduleTask(callback, delayMs) {
  return setTimeout(callback, delayMs);
}

export function getFormattedDate() {
  return new Date().toISOString();
}

export async function pollUntilReady(fetchStatus, maxAttempts = 10, intervalMs = 10) {
  for (let i = 0; i < maxAttempts; i++) {
    const status = await fetchStatus();
    if (status === 'READY') {
      return true;
    }
    await new Promise((resolve) => setTimeout(resolve, intervalMs));
  }
  throw new Error('Timed out waiting for status');
}
test/contract.mjs
import assert from 'node:assert';
import { createVitest } from 'vitest/node';

async function main() {
  console.log('Running vitest.vi contract verification...');

  // Initialize programmatic Vitest instance
  const vitest = await createVitest('test', {
    run: true,
    watch: false,
    reporters: ['basic'],
  });

  assert.ok(vitest, 'Vitest instance should be initialized');

  // Execute the test suite
  await vitest.start(['test/vi-features.test.js']);

  // Validate execution results
  const files = vitest.state.getFiles();
  assert.ok(files.length > 0, 'At least one test file must be executed');

  const testFile = files[0];
  assert.strictEqual(testFile.result?.state, 'pass', `Test file ${testFile.name} should pass`);

  const suite = testFile.tasks[0];
  assert.ok(suite.tasks && suite.tasks.length === 5, 'Expected 5 contract tests in suite');

  // Verify each contract assertion passed
  const contractTasks = suite.tasks;
  for (const task of contractTasks) {
    assert.strictEqual(task.result?.state, 'pass', `Task "${task.name}" should pass`);
  }

  // Contract 1: vi.fn creates mock functions that track call history, arguments, and return values
  const contract1 = contractTasks.find(t => t.name.includes('vi.fn creates mock functions'));
  assert.ok(contract1 && contract1.result?.state === 'pass', 'Contract 1 failed');

  // Contract 2: vi.spyOn observes and replaces object methods and supports restoring original implementations
  const contract2 = contractTasks.find(t => t.name.includes('vi.spyOn observes and replaces'));
  assert.ok(contract2 && contract2.result?.state === 'pass', 'Contract 2 failed');

  // Contract 3: vi.useFakeTimers and vi.advanceTimersByTime manipulate timer execution and intervals deterministically
  const contract3 = contractTasks.find(t => t.name.includes('vi.useFakeTimers and vi.advanceTimersByTime'));
  assert.ok(contract3 && contract3.result?.state === 'pass', 'Contract 3 failed');

  // Contract 4: vi.setSystemTime overrides the global Date and system clock for time-dependent testing
  const contract4 = contractTasks.find(t => t.name.includes('vi.setSystemTime overrides the global Date'));
  assert.ok(contract4 && contract4.result?.state === 'pass', 'Contract 4 failed');

  // Contract 5: vi.waitFor polls asynchronous operations until assertions pass or timeout occurs
  const contract5 = contractTasks.find(t => t.name.includes('vi.waitFor polls asynchronous operations'));
  assert.ok(contract5 && contract5.result?.state === 'pass', 'Contract 5 failed');

  await vitest.close();
  console.log('All vitest.vi contracts passed successfully.');
}

main().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});
test/vi-features.test.js
import { describe, it, expect, vi, afterEach } from 'vitest';
import {
  processPayment,
  scheduleTask,
  getFormattedDate,
  pollUntilReady,
} from '../src/service.js';

describe('vitest.vi API contracts', () => {
  afterEach(() => {
    vi.restoreAllMocks();
    vi.useRealTimers();
  });

  it('vi.fn creates mock functions that track call history, arguments, and return values', () => {
    const mockGateway = {
      charge: vi.fn((orderId, amount) => ({ success: true, txnId: `txn_${orderId}` })),
    };

    expect(vi.isMockFunction(mockGateway.charge)).toBe(true);

    const order = { id: 'ord_123', amount: 99.5 };
    const response = processPayment(mockGateway, order);

    expect(response).toEqual({ success: true, txnId: 'txn_ord_123' });
    expect(mockGateway.charge).toHaveBeenCalledTimes(1);
    expect(mockGateway.charge).toHaveBeenCalledWith('ord_123', 99.5);

    // Test mockReturnValueOnce override
    mockGateway.charge.mockReturnValueOnce({ success: false, reason: 'insufficient_funds' });
    const failedResponse = processPayment(mockGateway, order);
    expect(failedResponse).toEqual({ success: false, reason: 'insufficient_funds' });
    expect(mockGateway.charge).toHaveBeenCalledTimes(2);
  });

  it('vi.spyOn observes and replaces object methods and supports restoring original implementations', () => {
    const service = {
      computeFee: (amount) => amount * 0.05,
    };

    const spy = vi.spyOn(service, 'computeFee');
    expect(service.computeFee(100)).toBe(5);
    expect(spy).toHaveBeenCalledTimes(1);
    expect(spy).toHaveBeenCalledWith(100);

    // Override implementation with mockImplementation
    spy.mockImplementation((amount) => amount * 0.1);
    expect(service.computeFee(100)).toBe(10);
    expect(spy).toHaveBeenCalledTimes(2);

    // Restore original method
    spy.mockRestore();
    expect(service.computeFee(100)).toBe(5);
  });

  it('vi.useFakeTimers and vi.advanceTimersByTime manipulate timer execution and intervals deterministically', () => {
    vi.useFakeTimers();

    let taskExecuted = false;
    scheduleTask(() => {
      taskExecuted = true;
    }, 3000);

    expect(taskExecuted).toBe(false);

    vi.advanceTimersByTime(1500);
    expect(taskExecuted).toBe(false);

    vi.advanceTimersByTime(1500);
    expect(taskExecuted).toBe(true);
  });

  it('vi.setSystemTime overrides the global Date and system clock for time-dependent testing', () => {
    vi.useFakeTimers();

    const fixedEpoch = new Date('2025-01-01T00:00:00.000Z');
    vi.setSystemTime(fixedEpoch);

    expect(getFormattedDate()).toBe('2025-01-01T00:00:00.000Z');
    expect(Date.now()).toBe(fixedEpoch.getTime());

    const advancedEpoch = new Date('2025-12-31T23:59:59.000Z');
    vi.setSystemTime(advancedEpoch);
    expect(getFormattedDate()).toBe('2025-12-31T23:59:59.000Z');
  });

  it('vi.waitFor polls asynchronous operations until assertions pass or timeout occurs', async () => {
    let attempts = 0;
    const fetchStatus = vi.fn(async () => {
      attempts++;
      return attempts >= 3 ? 'READY' : 'PENDING';
    });

    const isReadyPromise = pollUntilReady(fetchStatus, 10, 5);

    await vi.waitFor(async () => {
      expect(fetchStatus).toHaveBeenCalled();
      const ready = await isReadyPromise;
      expect(ready).toBe(true);
    }, { timeout: 1000, interval: 10 });

    expect(attempts).toBe(3);
  });
});

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