test: simplify test-http2-client-promisify-connect-error

There is no need to try to create a TCP connection that fails due to a
missing listening server. Also, the port used for the connection might
be used by another process when the connection is made.
PR-URL: #57144
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: lpinca

test/parallel/test-http2-client-promisify-connect-error.js

@@ -8,14 +8,15 @@ const assert = require('assert');
 consthttp2=require('http2');
 constutil=require('util');
 
-constserver=http2.createServer();
+constconnect=util.promisify(http2.connect);
 
-server.listen(0,common.mustCall(()=>{
-constport=server.address().port;
-server.close(common.mustCall(()=>{
-constconnect=util.promisify(http2.connect);
-assert.rejects(connect(`http://localhost:${port}`),{
-code: 'ECONNREFUSED'
-}).then(common.mustCall());
-}));
-}));
+consterror=newError('Unable to resolve hostname');
+
+functionlookup(hostname,options,callback){
+callback(error);
+}
+
+assert.rejects(
+connect('http://hostname',{ lookup }),
+error,
+).then(common.mustCall());