test: update arrow function style

This commit applies new arrow function linting rules across the
codebase. As it turns out, the only offenders were in the test
directory.

PR-URL: https://github.com/nodejs/node/pull/4813
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/test/parallel/test-child-process-spawn-shell.js b/test/parallel/test-child-process-spawn-shell.js
index 555e02ff71..591fb409cb 100644
--- a/test/parallel/test-child-process-spawn-shell.js
+++ b/test/parallel/test-child-process-spawn-shell.js
@@ -26,7 +26,7 @@ let echoOutput = '';
 
 assert.strictEqual(echo.spawnargs[echo.spawnargs.length - 1].replace(/"/g, ''),
                    'echo foo');
-echo.stdout.on('data', data => {
+echo.stdout.on('data', (data) => {
   echoOutput += data;
 });
 echo.on('close', common.mustCall((code, signal) => {
@@ -41,7 +41,7 @@ const command = cp.spawn(cmd, {
 });
 let commandOutput = '';
 
-command.stdout.on('data', data => {
+command.stdout.on('data', (data) => {
   commandOutput += data;
 });
 command.on('close', common.mustCall((code, signal) => {
@@ -56,7 +56,7 @@ const env = cp.spawn(`"${process.execPath}" -pe process.env.BAZ`, {
 });
 let envOutput = '';
 
-env.stdout.on('data', data => {
+env.stdout.on('data', (data) => {
   envOutput += data;
 });
 env.on('close', common.mustCall((code, signal) => {