node/test/parallel/test-fs-watch-recursive-add-file-to-existing-subfolder.js

'use strict';

const common = require('../common');
const { setTimeout } = require('timers/promises');

if (common.isIBMi)
  common.skip('IBMi does not support `fs.watch()`');

// fs-watch on folders have limited capability in AIX.
// The testcase makes use of folder watching, and causes
// hang. This behavior is documented. Skip this for AIX.

if (common.isAIX)
  common.skip('folder watch capability is limited in AIX.');

const assert = require('assert');
const path = require('path');
const fs = require('fs');

const tmpdir = require('../common/tmpdir');
const testDir = tmpdir.path;
tmpdir.refresh();

(async () => {
  // Add a file to subfolder of a watching folder

  const rootDirectory = fs.mkdtempSync(testDir + path.sep);
  const testDirectory = path.join(rootDirectory, 'test-4');
  fs.mkdirSync(testDirectory);

  const file = 'folder-5';
  const filePath = path.join(testDirectory, file);
  fs.mkdirSync(filePath);

  const subfolderPath = path.join(filePath, 'subfolder-6');
  fs.mkdirSync(subfolderPath);

  const childrenFile = 'file-7.txt';
  const childrenAbsolutePath = path.join(subfolderPath, childrenFile);
  const relativePath = path.join(file, path.basename(subfolderPath), childrenFile);

  const watcher = fs.watch(testDirectory, { recursive: true });
  let watcherClosed = false;
  watcher.on('change', function(event, filename) {
    assert.strictEqual(event, 'rename');

    if (filename === relativePath) {
      watcher.close();
      watcherClosed = true;
    }
  });

  await setTimeout(common.platformTimeout(100));
  fs.writeFileSync(childrenAbsolutePath, 'world');

  process.once('exit', function() {
    assert(watcherClosed, 'watcher Object was not closed');
  });
})().then(common.mustCall());