test: use countdown in test file

Fixes: https://github.com/nodejs/node/issues/17169

PR-URL: https://github.com/nodejs/node/pull/17874
Fixes: https://github.com/nodejs/node/issues/17169


Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>