jest-watcher 29.7.0: JestHook

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.JestHook 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.JestHook
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.

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import { JestHook } from 'jest-watcher';

export function createJestHook() {
  return new JestHook();
}

export { JestHook };

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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "sample-jest-watcher-jest-hook",
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{
  "name": "sample-jest-watcher-jest-hook",
  "version": "1.0.0",
  "description": "Minimal clean-room sample verifying jest-watcher.JestHook in jest-watcher",
  "main": "index.js",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-watcher.JestHook in pkg:npm/jest-watcher@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-watcher@29.7.0"
  ],
  "symbols": [
    "jest-watcher.JestHook"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { JestHook } from 'jest-watcher';
import { createJestHook } from '../index.js';

async function run() {
  // 1. JestHook initializes with unused hook states for onFileChange, onTestRunComplete, and shouldRunTestSuite
  const hook = createJestHook();
  assert.equal(hook.isUsed('onFileChange'), false);
  assert.equal(hook.isUsed('onTestRunComplete'), false);
  assert.equal(hook.isUsed('shouldRunTestSuite'), false);
  assert.equal(hook.isUsed('unknownHook'), false);

  const subscriber = hook.getSubscriber();
  const emitter = hook.getEmitter();

  assert.equal(typeof subscriber.onFileChange, 'function');
  assert.equal(typeof subscriber.onTestRunComplete, 'function');
  assert.equal(typeof subscriber.shouldRunTestSuite, 'function');
  assert.equal(typeof emitter.onFileChange, 'function');
  assert.equal(typeof emitter.onTestRunComplete, 'function');
  assert.equal(typeof emitter.shouldRunTestSuite, 'function');

  // 2. JestHook getSubscriber registers onFileChange listeners and getEmitter synchronously dispatches filesystem state
  const receivedFsEvents = [];
  subscriber.onFileChange((fs) => {
    receivedFsEvents.push({ listener: 1, fs });
  });
  subscriber.onFileChange((fs) => {
    receivedFsEvents.push({ listener: 2, fs });
  });

  const mockFs = {
    projects: [
      {
        config: { rootDir: '/workspace' },
        testPaths: ['/workspace/tests/a.spec.js', '/workspace/tests/b.spec.js'],
      },
    ],
  };

  emitter.onFileChange(mockFs);
  assert.equal(receivedFsEvents.length, 2);
  assert.deepEqual(receivedFsEvents[0], { listener: 1, fs: mockFs });
  assert.deepEqual(receivedFsEvents[1], { listener: 2, fs: mockFs });

  // 3. JestHook getSubscriber registers onTestRunComplete listeners and getEmitter synchronously dispatches test results
  const receivedResults = [];
  subscriber.onTestRunComplete((results) => {
    receivedResults.push(results);
  });

  const mockResults = {
    numFailedTestSuites: 0,
    numFailedTests: 0,
    numPassedTestSuites: 2,
    numPassedTests: 8,
    numTotalTestSuites: 2,
    numTotalTests: 8,
    success: true,
    startTime: 1700000000000,
    wasInterrupted: false,
  };

  emitter.onTestRunComplete(mockResults);
  assert.equal(receivedResults.length, 1);
  assert.deepEqual(receivedResults[0], mockResults);

  // 4. JestHook emitter shouldRunTestSuite resolves true when no predicates are registered or when all predicates return truthy
  const freshHook = new JestHook();
  const freshEmitter = freshHook.getEmitter();
  const testSuite = { testPath: '/workspace/tests/example.test.js', config: {} };
  const initialDecision = await freshEmitter.shouldRunTestSuite(testSuite);
  assert.equal(initialDecision, true);

  const filteringHook = new JestHook();
  const filterSub = filteringHook.getSubscriber();
  const filterEmitter = filteringHook.getEmitter();

  filterSub.shouldRunTestSuite((suite) => suite.testPath.endsWith('.test.js'));
  filterSub.shouldRunTestSuite(async (suite) => !suite.testPath.includes('disabled'));

  const allowedDecision = await filterEmitter.shouldRunTestSuite(testSuite);
  assert.equal(allowedDecision, true);

  // 5. JestHook emitter shouldRunTestSuite resolves false when any synchronous or asynchronous predicate returns false
  const rejectedBySyncSuite = { testPath: '/workspace/tests/example.spec.js', config: {} };
  const syncDecision = await filterEmitter.shouldRunTestSuite(rejectedBySyncSuite);
  assert.equal(syncDecision, false);

  const rejectedByAsyncSuite = { testPath: '/workspace/tests/disabled.test.js', config: {} };
  const asyncDecision = await filterEmitter.shouldRunTestSuite(rejectedByAsyncSuite);
  assert.equal(asyncDecision, false);

  // 6. JestHook isUsed dynamically reflects listener registration status across known and unknown hooks
  assert.equal(hook.isUsed('onFileChange'), true);
  assert.equal(hook.isUsed('onTestRunComplete'), true);
  assert.equal(hook.isUsed('shouldRunTestSuite'), false);
  assert.equal(hook.isUsed('unknownHook'), false);

  assert.equal(filteringHook.isUsed('shouldRunTestSuite'), true);
  assert.equal(filteringHook.isUsed('onFileChange'), false);

  console.log('JestHook contract tests completed successfully.');
}

run();