Smartmatch is experimental at t/1.t line 21.
t/1.t .. 
1..6
ok 1
ok 2
ok 3
ok 4
ok 5
[2022-05-30 14:22:44] listening for DNS queries on address 127.0.0.1 and port 19550
ok 6
ok
All tests successful.
Files=1, Tests=6,  0 wallclock secs ( 0.04 usr  0.01 sys +  0.48 cusr  0.10 csys =  0.63 CPU)
Result: PASS