test: replace annonymous functions with arrow

PR-URL: nodejs#34921
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

test/parallel/test-net-reconnect.js

@@ -37,12 +37,12 @@ const server = net.createServer(function(socket) {
   console.error('SERVER connect, writing');
   socket.write('hello\r\n');
 
-  socket.on('end', function() {
+  socket.on('end', () => {
     console.error('SERVER socket end, calling end()');
     socket.end();
   });
 
-  socket.on('close', function(had_error) {
+  socket.on('close', (had_error) => {
     console.log(`SERVER had_error: ${JSON.stringify(had_error)}`);
     assert.strictEqual(had_error, false);
   });
@@ -54,7 +54,7 @@ server.listen(0, function() {
 
   client.setEncoding('UTF8');
 
-  client.on('connect', function() {
+  client.on('connect', () => {
     console.error('CLIENT connected', client._writableState);
   });
 
@@ -66,12 +66,12 @@ server.listen(0, function() {
     client.end();
   });
 
-  client.on('end', function() {
+  client.on('end', () => {
     console.error('CLIENT end');
     client_end_count++;
   });
 
-  client.on('close', function(had_error) {
+  client.on('close', (had_error) => {
     console.log('CLIENT disconnect');
     assert.strictEqual(had_error, false);
     if (disconnect_count++ < N)
@@ -81,7 +81,7 @@ server.listen(0, function() {
   });
 });
 
-process.on('exit', function() {
+process.on('exit', () => {
   assert.strictEqual(disconnect_count, N + 1);
   assert.strictEqual(client_recv_count, N + 1);
   assert.strictEqual(client_end_count, N + 1);