nodejs/test/parallel/test-fs-watch-recursive-add-file-to-new-folder.js

'use strict';

const common = require('../common');

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();

// Add a file to newly created folder to already watching folder

const rootDirectory = fs.mkdtempSync(testDir + path.sep);
const testDirectory = path.join(rootDirectory, 'test-3');
fs.mkdirSync(testDirectory);

const filePath = path.join(testDirectory, 'folder-3');

const childrenFile = 'file-4.txt';
const childrenAbsolutePath = path.join(filePath, childrenFile);
const childrenRelativePath = path.join(path.basename(filePath), childrenFile);
let watcherClosed = false;

function doWatch() {
  const watcher = fs.watch(testDirectory, { recursive: true });
  watcher.on('change', function(event, filename) {
    assert.strictEqual(event, 'rename');
    assert.ok(filename === path.basename(filePath) || filename === childrenRelativePath);

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

  // Do the write with a delay to ensure that the OS is ready to notify us.
  setTimeout(() => {
    fs.mkdirSync(filePath);
    fs.writeFileSync(childrenAbsolutePath, 'world');
  }, common.platformTimeout(200));
}

if (common.isMacOS) {
  // On macOS delay watcher start to avoid leaking previous events.
  // Refs: https://github.com/libuv/libuv/pull/4503
  setTimeout(doWatch, common.platformTimeout(100));
} else {
  doWatch();
}

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