test: add test for internalConnect() when address type is IPv6
According to the latest coverage report, internalConnect() is uncovered when address type is IPv6 (https://coverage.nodejs.org/coverage-36696cfe8479f3fd/root/net.js.html#L887). This PR adds a test for internalConnect() when address type is IPv6.
I didn't add a test when address type is neither IPv4 nor IPv6 since this condition isn't reachable.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines