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

[Lars Ingebrigtsen]

Robert Pluim <rpluim@gmail.com> writes:

> Then either we need to accept that this test can fail on some systems,
> or we risk calling the wrath of <insert large internet company> down
> upon us by putting one of their public servers in the test. Or we just
> use www.gnu.org

We can't use anything external -- that'd fail a lot more than using
(system-name).

But we should just disable this test if (system-name) doesn't resolve.
That should be easy enough to check for.  

(network-lookup-address-info (system-name))
=> ([127 0 1 1 0])

So reasonable values here would be 127 as the first octet on ipv4...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no