node/test/parallel/test-icu-data-dir.js

'use strict';
const common = require('../common');
if (!(common.hasIntl && common.hasSmallICU)) {
  common.skip('missing Intl');
  return;
}
const assert = require('assert');
const { spawnSync } = require('child_process');

const expected =
    'could not initialize ICU ' +
    '(check NODE_ICU_DATA or --icu-data-dir parameters)\n';

{
  const child = spawnSync(process.execPath, ['--icu-data-dir=/', '-e', '0']);
  assert(child.stderr.toString().includes(expected));
}

{
  const env = { NODE_ICU_DATA: '/' };
  const child = spawnSync(process.execPath, ['-e', '0'], { env });
  assert(child.stderr.toString().includes(expected));
}