test: replace anonymous closure with arrow functions

PR-URL: #24481
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: suman-mitra

test/pummel/test-net-pause.js

@@ -28,44 +28,44 @@ const N = 200;
 letrecv='';
 letchars_recved=0;
 
-constserver=net.createServer(function(connection){
+constserver=net.createServer((connection)=>{
 functionwrite(j){
 if(j>=N){
 connection.end();
 return;
 }
-setTimeout(function(){
+setTimeout(()=>{
 connection.write('C');
 write(j+1);
 },10);
 }
 write(0);
 });
 
-server.on('listening',function(){
+server.on('listening',()=>{
 constclient=net.createConnection(common.PORT);
 client.setEncoding('ascii');
 client.on('data',function(d){
 console.log(d);
 recv+=d;
 });
 
-setTimeout(function(){
+setTimeout(()=>{
 chars_recved=recv.length;
 console.log(`pause at: ${chars_recved}`);
 assert.strictEqual(chars_recved>1,true);
 client.pause();
-setTimeout(function(){
+setTimeout(()=>{
 console.log(`resume at: ${chars_recved}`);
 assert.strictEqual(chars_recved,recv.length);
 client.resume();
 
-setTimeout(function(){
+setTimeout(()=>{
 chars_recved=recv.length;
 console.log(`pause at: ${chars_recved}`);
 client.pause();
 
-setTimeout(function(){
+setTimeout(()=>{
 console.log(`resume at: ${chars_recved}`);
 assert.strictEqual(chars_recved,recv.length);
 client.resume();
@@ -78,14 +78,14 @@ server.on('listening', function() {
 
 },500);
 
-client.on('end',function(){
+client.on('end',()=>{
 server.close();
 client.end();
 });
 });
 server.listen(common.PORT);
 
-process.on('exit',function(){
+process.on('exit',()=>{
 assert.strictEqual(recv.length,N);
 console.error('Exit');
 });