test: update test-cluster-shared-handle-bind-error

- Remove assignment of this to variable.
- Add common.mustCall() as needed.
- Move from var to const.
PR-URL: #10547
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: cjihrig

test/parallel/test-cluster-shared-handle-bind-error.js

@@ -1,25 +1,26 @@
 'use strict';
-varcommon=require('../common');
-varassert=require('assert');
-varcluster=require('cluster');
-varnet=require('net');
+constcommon=require('../common');
+constassert=require('assert');
+constcluster=require('cluster');
+constnet=require('net');
 
 if(cluster.isMaster){
 // Master opens and binds the socket and shares it with the worker.
 cluster.schedulingPolicy=cluster.SCHED_NONE;
 // Hog the TCP port so that when the worker tries to bind, it'll fail.
-net.createServer(common.fail).listen(common.PORT,function(){
-varserver=this;
-varworker=cluster.fork();
-worker.on('exit',common.mustCall(function(exitCode){
+constserver=net.createServer(common.fail);
+
+server.listen(common.PORT,common.mustCall(()=>{
+constworker=cluster.fork();
+worker.on('exit',common.mustCall((exitCode)=>{
 assert.strictEqual(exitCode,0);
 server.close();
 }));
-});
+}));
 }else{
-vars=net.createServer(common.fail);
+consts=net.createServer(common.fail);
 s.listen(common.PORT,common.fail.bind(null,'listen should have failed'));
-s.on('error',common.mustCall(function(err){
+s.on('error',common.mustCall((err)=>{
 assert.strictEqual(err.code,'EADDRINUSE');
 process.disconnect();
 }));