wireaddr: adds test for punycode

Changelog-None

Author: m-schmoock

common/test/run-ip_port_parsing.c

@@ -128,6 +128,7 @@ int main(int argc, char *argv[])
 	assert(is_dnsaddr("is-valid.3hostname123.com"));
 	assert(is_dnsaddr("just-a-hostname-with-dashes"));
 	assert(is_dnsaddr("lightningd_dest.underscore.allowed.in.hostname.part.com"));
+	assert(is_dnsaddr("punycode.xn--bcher-kva.valid.com"));
 	assert(!is_dnsaddr("UPPERCASE.invalid.com"));
 	assert(!is_dnsaddr("-.invalid.com"));
 	assert(!is_dnsaddr("invalid.-example.com"));