test,dns: add coverage for dns exception

Add test coverage for dns.promises.resolve() handling an exception from
c-ares.

Refs: https://coverage.nodejs.org/coverage-d213f21c72f77da6/lib/internal/dns/promises.js.html#L198

PR-URL: #31678
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: David Carlier <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

Author: Trott

test/parallel/test-dns-resolve-promises.js

@@ -0,0 +1,20 @@
+// Flags: --expose-internals
+'use strict';
+require('../common');
+const assert = require('assert');
+const { internalBinding } = require('internal/test/binding');
+const cares = internalBinding('cares_wrap');
+const { UV_EPERM } = internalBinding('uv');
+const dnsPromises = require('dns').promises;
+
+// Stub cares to force an error so we can test DNS error code path.
+cares.ChannelWrap.prototype.queryA = () => UV_EPERM;
+
+assert.rejects(
+  dnsPromises.resolve('example.org'),
+  {
+    code: 'EPERM',
+    syscall: 'queryA',
+    hostname: 'example.org'
+  }
+);