test: favor arrow functions in callbacks

PR-URL: #24425 Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Ujjwal Sharma <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: UjjwalUpadhyay123-bit

test/parallel/test-https-agent-servername.js

@@ -1,5 +1,6 @@
 'use strict';
 constcommon=require('../common');
+constassert=require('assert');
 
 if(!common.hasCrypto)
 common.skip('missing crypto');
@@ -14,7 +15,7 @@ const options ={
 };
 
 
-constserver=https.Server(options,function(req,res){
+constserver=https.Server(options,(req,res)=>{
 res.writeHead(200);
 res.end('hello world\n');
 });
@@ -27,11 +28,11 @@ server.listen(0, function(){
 rejectUnauthorized: true,
 servername: 'agent1',
 ca: options.ca
-},function(res){
+},(res)=>{
 res.resume();
-console.log(res.statusCode);
+assert.strictEqual(res.statusCode,200);
 server.close();
-}).on('error',function(e){
+}).on('error',(e)=>{
 console.log(e.message);
 process.exit(1);
 });