test: improve test coverage of lib/dns

PR-URL: #46910
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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());
+
 (async function() {
   await dnsPromises.lookup('', { family: 4, hints: 0 });
   await dnsPromises.lookup('', { family: 6, hints: dns.ADDRCONFIG });