test: improve test coverage of dns/promises

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

@@ -0,0 +1,27 @@
+// Flags: --expose-internals
+'use strict';
+const common = require('../common');
+const { internalBinding } = require('internal/test/binding');
+const cares = internalBinding('cares_wrap');
+cares.getaddrinfo = () => internalBinding('uv').UV_ENOMEM;
+
+// This test ensures that dns.lookup issue a DeprecationWarning
+// when invalid options type is given
+
+const dns = require('dns');
+const dnsPromises = 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'
+  }
+});
+
+dnsPromises.lookup('127.0.0.1', { hints: '1024' });
+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');