test: clean up dgram-broadcast-multi-process test

Use assert.strictEqual() instead of assert.equal(),
=== instead of ==, and const instead of var.

PR-URL: https://github.com/nodejs/node/pull/9308
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Bryan English <bryan@bryanenglish.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/internet/test-dgram-broadcast-multi-process.js

@@ -20,15 +20,17 @@ if (common.inFreeBSDJail) {
   return;
 }
 
+let bindAddress = null;
+
 // Take the first non-internal interface as the address for binding.
 // Ideally, this should check for whether or not an interface is set up for
 // BROADCAST and favor internal/private interfaces.
-get_bindAddress: for (var name in networkInterfaces) {
-  var interfaces = networkInterfaces[name];
-  for (var i = 0; i < interfaces.length; i++) {
-    var localInterface = interfaces[i];
+get_bindAddress: for (const name in networkInterfaces) {
+  const interfaces = networkInterfaces[name];
+  for (let i = 0; i < interfaces.length; i++) {
+    const localInterface = interfaces[i];
     if (!localInterface.internal && localInterface.family === 'IPv4') {
-      var bindAddress = localInterface.address;
+      bindAddress = localInterface.address;
       break get_bindAddress;
     }
   }
@@ -56,9 +58,9 @@ if (process.argv[2] !== 'child') {
   }, TIMEOUT);
 
   //launch child processes
-  for (var x = 0; x < listeners; x++) {
+  for (let x = 0; x < listeners; x++) {
     (function() {
-      var worker = fork(process.argv[1], ['child']);
+      const worker = fork(process.argv[1], ['child']);
       workers[worker.pid] = worker;
 
       worker.messagesReceived = [];
@@ -68,7 +70,7 @@ if (process.argv[2] !== 'child') {
         // don't consider this the true death if the worker
         // has finished successfully
         // or if the exit code is 0
-        if (worker.isDone || code == 0) {
+        if (worker.isDone || code === 0) {
           return;
         }
 
@@ -113,12 +115,12 @@ if (process.argv[2] !== 'child') {
                           'messages. Will now compare.');
 
             Object.keys(workers).forEach(function(pid) {
-              var worker = workers[pid];
+              const worker = workers[pid];
 
-              var count = 0;
+              let count = 0;
 
               worker.messagesReceived.forEach(function(buf) {
-                for (var i = 0; i < messages.length; ++i) {
+                for (let i = 0; i < messages.length; ++i) {
                   if (buf.toString() === messages[i].toString()) {
                     count++;
                     break;
@@ -130,8 +132,11 @@ if (process.argv[2] !== 'child') {
                             worker.pid,
                             count);
 
-              assert.equal(count, messages.length,
-                           'A worker received an invalid multicast message');
+              assert.strictEqual(
+                count,
+                messages.length,
+                'A worker received an invalid multicast message'
+              );
             });
 
             clearTimeout(timer);
@@ -143,7 +148,7 @@ if (process.argv[2] !== 'child') {
     })(x);
   }
 
-  var sendSocket = dgram.createSocket({
+  const sendSocket = dgram.createSocket({
     type: 'udp4',
     reuseAddr: true
   });
@@ -160,7 +165,7 @@ if (process.argv[2] !== 'child') {
   });
 
   sendSocket.sendNext = function() {
-    var buf = messages[i++];
+    const buf = messages[i++];
 
     if (!buf) {
       try { sendSocket.close(); } catch (e) {}
@@ -186,15 +191,15 @@ if (process.argv[2] !== 'child') {
 
   function killChildren(children) {
     Object.keys(children).forEach(function(key) {
-      var child = children[key];
+      const child = children[key];
       child.kill();
     });
   }
 }
 
 if (process.argv[2] === 'child') {
-  var receivedMessages = [];
-  var listenSocket = dgram.createSocket({
+  const receivedMessages = [];
+  const listenSocket = dgram.createSocket({
     type: 'udp4',
     reuseAddr: true
   });
@@ -212,7 +217,7 @@ if (process.argv[2] === 'child') {
 
     process.send({message: buf.toString()});
 
-    if (receivedMessages.length == messages.length) {
+    if (receivedMessages.length === messages.length) {
       process.nextTick(function() {
         listenSocket.close();
       });