test: replace function with ES6 arrow function

PR-URL: #17306 Reviewed-By: Daijiro Wachi <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: Jon Moss <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Yuta Hiroto <[email protected]>

Author: kjunichi

test/parallel/test-http-pause.js

@@ -29,17 +29,17 @@ let resultServer = ''
 constexpectedClient='Response Body from Server';
 letresultClient='';
 
-constserver=http.createServer(function(req,res){
+constserver=http.createServer((req,res)=>{
 console.error('pause server request');
 req.pause();
-setTimeout(function(){
+setTimeout(()=>{
 console.error('resume server request');
 req.resume();
 req.setEncoding('utf8');
-req.on('data',function(chunk){
+req.on('data',(chunk)=>{
 resultServer+=chunk;
 });
-req.on('end',function(){
+req.on('end',()=>{
 console.error(resultServer);
 res.writeHead(200);
 res.end(expectedClient);
@@ -52,16 +52,16 @@ server.listen(0, function(){
 port: this.address().port,
 path: '/',
 method: 'POST'
-},function(res){
+},(res)=>{
 console.error('pause client response');
 res.pause();
-setTimeout(function(){
+setTimeout(()=>{
 console.error('resume client response');
 res.resume();
-res.on('data',function(chunk){
+res.on('data',(chunk)=>{
 resultClient+=chunk;
 });
-res.on('end',function(){
+res.on('end',()=>{
 console.error(resultClient);
 server.close();
 });
@@ -70,7 +70,7 @@ server.listen(0, function(){
 req.end(expectedServer);
 });
 
-process.on('exit',function(){
+process.on('exit',()=>{
 assert.strictEqual(expectedServer,resultServer);
 assert.strictEqual(expectedClient,resultClient);
 });