test-dns-promises-lookupService assumes getnameinfo can return named service

[kapouer]

Version

HEAD

Platform

No response

Subsystem

test

What steps will reproduce the bug?

node test/parallel/test-dns-lookupService-promises.js

How often does it reproduce? Is there a required condition?

On a clean linux chroot without /etc/services (which is provided by nonessential netbase package, not guaranteed to be installed)

What is the expected behavior?

Test should allow dnsPromises.lookupService('127.0.0.1', 22) to return service with 22 or 'ssh'.

What do you see instead?

AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
'22' !== 'ssh'
at /tmp/autopkgtest.2FaIUP/build.wly/src/test/parallel/test-dns-lookupService-promises.js:9:10

Additional information

It's the only test assuming getnameinfo will return the service name.