test: improve test coverage of dns/promises

PR-URL: #41133
Refs: https://coverage.nodejs.org/coverage-18ff5832501b66b4/lib/internal/dns/promises.js.html#L116
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Qingyu Deng <i@ayase-lab.com>

Author: kuriyosh

test/parallel/test-dns-lookup-promises-options-deprecated.js

@@ -0,0 +1,32 @@
+// Flags: --expose-internals
+'use strict';
+constcommon=require('../common');
+constassert=require('assert');
+const{ internalBinding }=require('internal/test/binding');
+constcares=internalBinding('cares_wrap');
+cares.getaddrinfo=()=>internalBinding('uv').UV_ENOMEM;
+
+// This test ensures that dns.lookup issue a DeprecationWarning
+// when invalid options type is given
+
+constdnsPromises=require('dns/promises');
+
+common.expectWarning({
+'internal/test/binding': [
+'These APIs are for internal testing only. Do not use them.',
+],
+'DeprecationWarning': {
+DEP0153: 'Type coercion of dns.lookup options is deprecated'
+}
+});
+
+assert.throws(()=>{
+dnsPromises.lookup('127.0.0.1',{hints: '-1'});
+},{
+code: 'ERR_INVALID_ARG_VALUE',
+name: 'TypeError'
+});
+dnsPromises.lookup('127.0.0.1',{family: '6'});
+dnsPromises.lookup('127.0.0.1',{all: 'true'});
+dnsPromises.lookup('127.0.0.1',{verbatim: 'true'});
+dnsPromises.lookup('127.0.0.1','6');