test: add test-dns-promises-lookupService
This adds covereage for the onlookupservice() callback in lib/internal/dns/promises.js. Because of stubbing in other tests, it is not currently covered.
This test works on my local development machine with the network turned off, so I'm putting it in parallel. If CI proves more challenging, it can be moved to the internet directory instead.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines