test: refactor test-http-pause-resume-one-end

* setTimeout() with no duration -> setImmediate() * var -> const * remove unused variable `chunk` PR-URL: #10210 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Santiago Gimeno <[email protected]> Reviewed-By: Michaël Zasso <[email protected]>

Author: Trott

test/parallel/test-http-pause-resume-one-end.js

@@ -1,23 +1,23 @@
 'use strict';
 constcommon=require('../common');
-varhttp=require('http');
+consthttp=require('http');
 
-varserver=http.Server(function(req,res){
+constserver=http.Server(function(req,res){
 res.writeHead(200,{'Content-Type': 'text/plain'});
 res.end('Hello World\n');
 server.close();
 });
 
 server.listen(0,common.mustCall(function(){
-varopts={
+constopts={
 port: this.address().port,
 headers: {connection: 'close'}
 };
 
 http.get(opts,common.mustCall(function(res){
-res.on('data',common.mustCall(function(chunk){
+res.on('data',common.mustCall(function(){
 res.pause();
-setTimeout(function(){
+setImmediate(function(){
 res.resume();
 });
 }));