3c92ca2b5c should have had tests
to go along with it. This adds tests for the following functions:
* `process.geteuid()`
* `process.seteuid()`
* `process.getegid()`
* `process.setegid()`
PR-URL: https://github.com/nodejs/node/pull/14091
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Claudio Rodriguez <cjrodr@yahoo.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
