jest-watcher 29.7.0: TestWatcher

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-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-watcher@29.7.0
Demonstrate these symbols/APIs:
  - jest-watcher.TestWatcher

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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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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      "version": "1.0.0",
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      }
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{
  "name": "verify-jest-watcher",
  "version": "1.0.0",
  "type": "module",
  "description": "Verification sample for jest-watcher TestWatcher",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-watcher@29.7.0"
  ],
  "symbols": [
    "jest-watcher.TestWatcher"
  ]
}

import { TestWatcher } from 'jest-watcher';

/**
 * Creates and initializes a TestWatcher instance.
 * @param {object} options
 * @param {boolean} options.isWatchMode
 * @returns {TestWatcher}
 */
export function createTestWatcher({ isWatchMode = false } = {}) {
  return new TestWatcher({ isWatchMode });
}

export { TestWatcher };
export default TestWatcher;

import assert from 'node:assert/strict';
import { TestWatcher, createTestWatcher } from '../src/index.mjs';

// 1. TestWatcher class instantiates with watch mode configuration flag
{
  const watcherWatch = new TestWatcher({ isWatchMode: true });
  assert.equal(watcherWatch.isWatchMode(), true);

  const watcherNonWatch = new TestWatcher({ isWatchMode: false });
  assert.equal(watcherNonWatch.isWatchMode(), false);

  const helperWatcher = createTestWatcher({ isWatchMode: true });
  assert.equal(helperWatcher.isWatchMode(), true);
}

// 2. TestWatcher initializes state with interrupted flag set to false
{
  const watcher = new TestWatcher({ isWatchMode: true });
  assert.deepEqual(watcher.state, { interrupted: false });
}

// 3. TestWatcher isInterrupted reflects current interrupted state
{
  const watcher = new TestWatcher({ isWatchMode: true });
  assert.equal(watcher.isInterrupted(), false);
}

// 4. TestWatcher setState updates state properties asynchronously
{
  const watcher = new TestWatcher({ isWatchMode: true });
  await watcher.setState({ interrupted: true });
  assert.equal(watcher.isInterrupted(), true);
  assert.equal(watcher.state.interrupted, true);

  await watcher.setState({ interrupted: false });
  assert.equal(watcher.isInterrupted(), false);
  assert.equal(watcher.state.interrupted, false);
}

// 5. TestWatcher emits change event with updated state upon setState
{
  const watcher = new TestWatcher({ isWatchMode: true });
  const events = [];

  watcher.on('change', (state) => {
    events.push({ ...state });
  });

  await watcher.setState({ interrupted: true });
  assert.equal(events.length, 1);
  assert.deepEqual(events[0], { interrupted: true });

  await watcher.setState({ interrupted: false });
  assert.equal(events.length, 2);
  assert.deepEqual(events[1], { interrupted: false });
}

// 6. TestWatcher supports event listener registration and unsubscription inherited from Emittery
{
  const watcher = new TestWatcher({ isWatchMode: true });
  let count = 0;
  const unsubscribe = watcher.on('change', () => {
    count++;
  });

  await watcher.setState({ interrupted: true });
  assert.equal(count, 1);

  unsubscribe();
  await watcher.setState({ interrupted: false });
  assert.equal(count, 1);
}

console.log('All jest-watcher.TestWatcher contract assertions passed.');