test: improve test coverage of lib/dns

PR-URL: #46910 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]>

Author: paivaandeerson

test/parallel/test-dns.js

@@ -239,6 +239,14 @@ assert.throws(() => dns.lookup('nodejs.org', 4),{
 name: 'TypeError'
 });
 
+assert.throws(()=>dns.lookup('',{
+family: 'nodejs.org',
+hints: dns.ADDRCONFIG|dns.V4MAPPED|dns.ALL,
+}),{
+code: 'ERR_INVALID_ARG_TYPE',
+name: 'TypeError'
+});
+
 dns.lookup('',{family: 4,hints: 0},common.mustCall());
 
 dns.lookup('',{
@@ -264,6 +272,16 @@ dns.lookup('',{
 hints: dns.ADDRCONFIG|dns.V4MAPPED|dns.ALL
 },common.mustCall());
 
+dns.lookup('',{
+hints: dns.ADDRCONFIG|dns.V4MAPPED|dns.ALL,
+family: 'IPv4'
+},common.mustCall());
+
+dns.lookup('',{
+hints: dns.ADDRCONFIG|dns.V4MAPPED|dns.ALL,
+family: 'IPv6'
+},common.mustCall());
+
 (asyncfunction(){
 awaitdnsPromises.lookup('',{family: 4,hints: 0});
 awaitdnsPromises.lookup('',{family: 6,hints: dns.ADDRCONFIG});