Smartmatch is experimental at t/1.t line 21.
t/1.t .. 
1..6
ok 1
ok 2
ok 3
ok 4
ok 5
[2018-09-21 16:39:51] listening for DNS queries on address 127.0.0.1 and port 18378
ok 6
ok
All tests successful.
Files=1, Tests=6,  0 wallclock secs ( 0.03 usr  0.00 sys +  0.24 cusr  0.03 csys =  0.30 CPU)
Result: PASS