test: use arrow functions in async-hooks tests

Convert all anonymous callback functions in `test/async-hooks/*.js`
to use arrow functions.

`writing-tests.md` states to use arrow functions when appropriate.

PR-URL: https://github.com/nodejs/node/pull/30137
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

6 files changed, 13 insertions, 13 deletions

diff --git a/test/async-hooks/test-disable-in-init.js b/test/async-hooks/test-disable-in-init.js
index b7ab31e6d9..17537c62f3 100644
--- a/test/async-hooks/test-disable-in-init.js
+++ b/test/async-hooks/test-disable-in-init.js
@@ -7,7 +7,7 @@ const fs = require('fs');
 let nestedCall = false;
 
 async_hooks.createHook({
-  init: common.mustCall(function() {
+  init: common.mustCall(() => {
     nestedHook.disable();
     if (!nestedCall) {
       nestedCall = true;
diff --git a/test/async-hooks/test-graph.http.js b/test/async-hooks/test-graph.http.js
index 12862467a6..db0c126567 100644
--- a/test/async-hooks/test-graph.http.js
+++ b/test/async-hooks/test-graph.http.js
@@ -11,11 +11,11 @@ const http = require('http');
 const hooks = initHooks();
 hooks.enable();
 
-const server = http.createServer(common.mustCall(function(req, res) {
+const server = http.createServer(common.mustCall((req, res) => {
   res.end();
-  this.close(common.mustCall());
+  server.close(common.mustCall());
 }));
-server.listen(0, common.mustCall(function() {
+server.listen(0, common.mustCall(() => {
   http.get({
     host: '::1',
     family: 6,
@@ -23,7 +23,7 @@ server.listen(0, common.mustCall(function() {
   }, common.mustCall());
 }));
 
-process.on('exit', function() {
+process.on('exit', () => {
   hooks.disable();
 
   verifyGraph(
diff --git a/test/async-hooks/test-graph.pipeconnect.js b/test/async-hooks/test-graph.pipeconnect.js
index 03d2902c83..440ea906a1 100644
--- a/test/async-hooks/test-graph.pipeconnect.js
+++ b/test/async-hooks/test-graph.pipeconnect.js
@@ -12,9 +12,9 @@ tmpdir.refresh();
 const hooks = initHooks();
 hooks.enable();
 
-net.createServer(function(c) {
+const server = net.createServer((c) => {
   c.end();
-  this.close();
+  server.close();
 }).listen(common.PIPE, common.mustCall(onlisten));
 
 function onlisten() {
diff --git a/test/async-hooks/test-nexttick-default-trigger.js b/test/async-hooks/test-nexttick-default-trigger.js
index 1bc93f2973..7d6d98c9ab 100644
--- a/test/async-hooks/test-nexttick-default-trigger.js
+++ b/test/async-hooks/test-nexttick-default-trigger.js
@@ -14,11 +14,11 @@ hooks.enable();
 
 const rootAsyncId = async_hooks.executionAsyncId();
 
-process.nextTick(common.mustCall(function() {
+process.nextTick(common.mustCall(() => {
   assert.strictEqual(async_hooks.triggerAsyncId(), rootAsyncId);
 }));
 
-process.on('exit', function() {
+process.on('exit', () => {
   hooks.sanityCheck();
 
   const as = hooks.activitiesOfTypes('TickObject');
diff --git a/test/async-hooks/test-pipeconnectwrap.js b/test/async-hooks/test-pipeconnectwrap.js
index f086807e39..b57cc63cf5 100644
--- a/test/async-hooks/test-pipeconnectwrap.js
+++ b/test/async-hooks/test-pipeconnectwrap.js
@@ -17,9 +17,9 @@ let pipe1, pipe2;
 let pipeserver;
 let pipeconnect;
 
-net.createServer(common.mustCall(function(c) {
+const server = net.createServer(common.mustCall((c) => {
   c.end();
-  this.close();
+  server.close();
   process.nextTick(maybeOnconnect.bind(null, 'server'));
 })).listen(common.PIPE, common.mustCall(onlisten));
 
diff --git a/test/async-hooks/test-queue-microtask.js b/test/async-hooks/test-queue-microtask.js
index dfa537752e..1e2029efe4 100644
--- a/test/async-hooks/test-queue-microtask.js
+++ b/test/async-hooks/test-queue-microtask.js
@@ -11,11 +11,11 @@ hooks.enable();
 
 const rootAsyncId = async_hooks.executionAsyncId();
 
-queueMicrotask(common.mustCall(function() {
+queueMicrotask(common.mustCall(() => {
   assert.strictEqual(async_hooks.triggerAsyncId(), rootAsyncId);
 }));
 
-process.on('exit', function() {
+process.on('exit', () => {
   hooks.sanityCheck();
 
   const as = hooks.activitiesOfTypes('Microtask');