jest-validate 30.4.1: logValidationWarning

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 jest-validate.logValidationWarning in pkg:npm/jest-validate@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-validate@30.4.1
Demonstrate these symbols/APIs:
  - jest-validate.logValidationWarning

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.

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{
  "name": "sample-jest-validate-log-validation-warning",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of jest-validate.logValidationWarning",
  "main": "src/index.js",
  "dependencies": {
    "jest-validate": "30.4.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-validate.logValidationWarning in pkg:npm/jest-validate@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-validate@30.4.1"
  ],
  "symbols": [
    "jest-validate.logValidationWarning"
  ]
}

const { logValidationWarning } = require('jest-validate');

/**
 * Log a configuration warning with a title, message, and optional comment.
 * @param {string} title
 * @param {string} message
 * @param {string} [comment]
 */
function warnOption(title, message, comment) {
  logValidationWarning(title, message, comment);
}

/**
 * Log a deprecation warning recommending a replacement option.
 * @param {string} optionName
 * @param {string} replacementOption
 */
function warnDeprecated(optionName, replacementOption) {
  const title = 'Deprecation Warning';
  const message = `Option "${optionName}" is deprecated.`;
  const comment = `Please use "${replacementOption}" instead.`;
  logValidationWarning(title, message, comment);
}

module.exports = {
  logValidationWarning,
  warnOption,
  warnDeprecated
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { logValidationWarning, warnOption, warnDeprecated } = require('../src/index.js');

function stripAnsi(str) {
  return typeof str === 'string' ? str.replace(/\u001b\[[0-9;]*m/g, '') : str;
}

// 1. Export verification
assert.strictEqual(typeof logValidationWarning, 'function', 'logValidationWarning should be a function');
assert.strictEqual(typeof warnOption, 'function', 'warnOption should be a function');
assert.strictEqual(typeof warnDeprecated, 'function', 'warnDeprecated should be a function');

// 2. Capture console.warn
const originalWarn = console.warn;
let capturedWarnings = [];

console.warn = (...args) => {
  capturedWarnings.push(args.map(a => stripAnsi(a)).join(' '));
};

try {
  // logValidationWarning formats and logs warning messages to console.warn
  capturedWarnings = [];
  warnOption('Validation Warning', 'Unknown option "timeoutSec".');
  assert.strictEqual(capturedWarnings.length, 1, 'Should emit exactly one warning');
  assert.ok(capturedWarnings[0].includes('Validation Warning:'), 'Warning should include title header');
  assert.ok(capturedWarnings[0].includes('Unknown option "timeoutSec".'), 'Warning should include message body');

  // logValidationWarning appends guidance comments when provided
  capturedWarnings = [];
  warnOption('Validation Warning', 'Unknown option "timeoutSec".', 'Did you mean "timeoutSeconds"?');
  assert.strictEqual(capturedWarnings.length, 1, 'Should emit exactly one warning');
  assert.ok(
    capturedWarnings[0].includes('Validation Warning:\n\nUnknown option "timeoutSec".\n\nDid you mean "timeoutSeconds"?'),
    'Warning should format title, message, and comment with double newlines'
  );

  // warnDeprecated formats standardized deprecation notices with replacement suggestions
  capturedWarnings = [];
  warnDeprecated('usePolling', 'watchOptions.poll');
  assert.strictEqual(capturedWarnings.length, 1, 'Should emit one deprecation warning');
  assert.ok(capturedWarnings[0].includes('Deprecation Warning:'), 'Should have Deprecation Warning title');
  assert.ok(capturedWarnings[0].includes('Option "usePolling" is deprecated.'), 'Should state deprecated option');
  assert.ok(capturedWarnings[0].includes('Please use "watchOptions.poll" instead.'), 'Should recommend replacement');

  // logValidationWarning formats single warning message when comment is omitted
  capturedWarnings = [];
  logValidationWarning('Notice', 'Direct warning message');
  assert.strictEqual(capturedWarnings.length, 1, 'Should emit direct warning');
  assert.ok(capturedWarnings[0].includes('Notice:\n\nDirect warning message\n'), 'Direct warning without comment should format properly');

  console.log('Contract tests passed successfully.');
} finally {
  console.warn = originalWarn;
}