jest-validate 30.4.1: ValidationError

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.ValidationError 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.ValidationError

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.

# jest-validate ValidationError Sample

Demonstrates the use of `ValidationError` from `jest-validate` to handle schema validation errors, construct custom validation errors with descriptive comments, and verify error types.

## Verification

Run contract verification:
```bash
node test/contract.mjs
```

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

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

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

/**
 * Check if a given error is an instance of ValidationError.
 * @param {unknown} error - The error to check.
 * @returns {boolean} True if the error is a ValidationError.
 */
function isValidationError(error) {
  return error instanceof ValidationError;
}

/**
 * Create a custom ValidationError instance.
 * @param {string} title - Error title/header.
 * @param {string} message - Error description.
 * @param {string} [comment] - Optional hint or remediation advice.
 * @returns {ValidationError} The created ValidationError instance.
 */
function createValidationError(title, message, comment) {
  return new ValidationError(title, message, comment);
}

/**
 * Validate a configuration object against an example configuration schema.
 * Throws ValidationError if the configuration is invalid.
 * @param {Record<string, unknown>} config - User-provided config.
 * @param {Record<string, unknown>} exampleConfig - Template example config.
 * @param {object} [options] - Additional validation options.
 * @returns {{ hasDeprecationWarnings: boolean, isValid: boolean }} Validation result.
 */
function validateConfig(config, exampleConfig, options = {}) {
  return validate(config, {
    exampleConfig,
    ...options
  });
}

/**
 * Enforce validation rules on a configuration object.
 * @param {Record<string, unknown>} config - User-provided config.
 * @param {Record<string, unknown>} exampleConfig - Template example config.
 * @returns {boolean} True if valid, throws ValidationError otherwise.
 */
function assertValidConfig(config, exampleConfig) {
  validateConfig(config, exampleConfig);
  return true;
}

module.exports = {
  ValidationError,
  validateConfig,
  assertValidConfig,
  createValidationError,
  isValidationError
};

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

const require = createRequire(import.meta.url);
const {
  ValidationError,
  validateConfig,
  assertValidConfig,
  createValidationError,
  isValidationError
} = require('../src/index.js');

// 1. ValidationError is exported by jest-validate as a subclass of Error
assert.strictEqual(typeof ValidationError, 'function', 'ValidationError should be a constructor function');
assert.strictEqual(
  Object.prototype.isPrototypeOf.call(Error, ValidationError),
  true,
  'ValidationError should inherit from Error'
);

// 2. ValidationError constructor creates an error instance with formatted name, message, and comment
const customErr = createValidationError(
  'Configuration Error',
  'Property "port" must be an integer.',
  'Did you mean port: 8080?'
);
assert.strictEqual(customErr instanceof ValidationError, true);
assert.strictEqual(customErr instanceof Error, true);
assert.strictEqual(typeof customErr.message, 'string');
assert.ok(
  customErr.message.includes('Configuration Error'),
  'Error message should contain specified header'
);
assert.ok(
  customErr.message.includes('Property "port" must be an integer.'),
  'Error message should contain body message'
);
assert.ok(
  customErr.message.includes('Did you mean port: 8080?'),
  'Error message should contain comment'
);

// 3. ValidationError constructor handles missing optional comment parameter
const errWithoutComment = new ValidationError('Simple Error', 'Something went wrong');
assert.strictEqual(errWithoutComment instanceof ValidationError, true);
assert.ok(errWithoutComment.message.includes('Simple Error'));
assert.ok(errWithoutComment.message.includes('Something went wrong'));

// 4. isValidationError correctly identifies ValidationError instances and distinguishes regular Error instances
assert.strictEqual(isValidationError(customErr), true);
assert.strictEqual(isValidationError(new Error('generic error')), false);
assert.strictEqual(isValidationError({ message: 'fake error' }), false);
assert.strictEqual(isValidationError(null), false);

// 5. validateConfig throws ValidationError when configuration option type mismatches exampleConfig
const exampleConfig = {
  timeout: 5000,
  retries: 3,
  debug: false
};

const invalidConfig = {
  timeout: '5000',
  retries: 3
};

assert.throws(
  () => {
    validateConfig(invalidConfig, exampleConfig);
  },
  (err) => {
    return (
      isValidationError(err) &&
      err.message.includes('Option "timeout" must be of type:')
    );
  },
  'validateConfig should throw ValidationError on type mismatch'
);

// 6. assertValidConfig succeeds for valid configurations matching exampleConfig schema
const validConfig = {
  timeout: 3000,
  retries: 2,
  debug: true
};

const validationSuccess = assertValidConfig(validConfig, exampleConfig);
assert.strictEqual(validationSuccess, true, 'assertValidConfig should return true for valid config');

console.log('Contract tests passed successfully.');