test: lint and refactor to avoid autocrlf issue

The test was failing after adding 'use strict' because the windows CI
uses the autocrlf option of git which converts \r into \r\n on checkout.

Refactored the test to not read itself anymore and create a temp file on
the fly instead to avoid this line-ending issue.

PR-URL: https://github.com/nodejs/node/pull/2494


Reviewed-By: Joao Reis <reis@janeasystems.com>