bug#42535: 28.0.50; macOS test failure: echo-server-with-dns

[Robert Pluim]

>>>>> On Tue, 04 Aug 2020 16:12:03 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> The test also assumes that (system-name) results in a resolvable name,
    >> which is not always true (you can stick an entry in /etc/hosts to make
    >> it true).

    Lars> It's supposed to test DNS, though -- is there something that'll be 
more
    Lars> reliable than (system-name)?  (Not that it's reliable, but...  more.  
:-))

localhost? But the next test already checks that. Is anyone still
running any public echo servers?

If what you really want to test is "does DNS work", then
src/process-tests.el already does that with 'network-lookup-address-info',
which shares the actual lookup code with 'make-network-process'.

Robert