test: change anonymous function to arrow function

PR-URL: #24528
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Author: codegagan

test/parallel/test-http-client-timeout-agent.js

@@ -32,7 +32,7 @@ const options = {
 host: '127.0.0.1',
 };
 
-constserver=http.createServer(function(req,res){
+constserver=http.createServer((req,res)=>{
 constm=/\/(.*)/.exec(req.url);
 constreqid=parseInt(m[1],10);
 if(reqid%2){
@@ -51,7 +51,7 @@ server.listen(0, options.host, function() {
 options.path=`/${requests_sent}`;
 constreq=http.request(options);
 req.id=requests_sent;
-req.on('response',function(res){
+req.on('response',(res)=>{
 res.on('data',function(data){
 console.log(`res#${this.req.id} data:${data}`);
 });
@@ -78,7 +78,7 @@ server.listen(0, options.host, function() {
 
 setTimeout(functionmaybeDone(){
 if(requests_done>=requests_sent){
-setTimeout(function(){
+setTimeout(()=>{
 server.close();
 },100);
 }else{
@@ -87,7 +87,7 @@ server.listen(0, options.host, function() {
 },100);
 });
 
-process.on('exit',function(){
+process.on('exit',()=>{
 console.error(`done=${requests_done} sent=${requests_sent}`);
 // check that timeout on http request was not called too much
 assert.strictEqual(requests_done,requests_sent);