diff --git a/src/node/hooks/express/tests.js b/src/node/hooks/express/tests.js
index 87edc2a09..641ca819a 100644
--- a/src/node/hooks/express/tests.js
+++ b/src/node/hooks/express/tests.js
@@ -1,9 +1,11 @@
+'use strict';
+
 const path = require('path');
 const npm = require('npm');
 const fs = require('fs');
 const util = require('util');
 
-exports.expressCreateServer = function (hook_name, args, cb) {
+exports.expressCreateServer = (hookName, args, cb) => {
   args.app.get('/tests/frontend/specs_list.js', async (req, res) => {
     const [coreTests, pluginTests] = await Promise.all([
       exports.getCoreTests(),
@@ -24,9 +26,9 @@ exports.expressCreateServer = function (hook_name, args, cb) {
   // path.join seems to normalize by default, but we'll just be explicit
   const rootTestFolder = path.normalize(path.join(npm.root, '../tests/frontend/'));
 
-  const url2FilePath = function (url) {
+  const url2FilePath = (url) => {
     let subPath = url.substr('/tests/frontend'.length);
-    if (subPath == '') {
+    if (subPath === '') {
       subPath = 'index.html';
     }
     subPath = subPath.split('?')[0];
@@ -49,8 +51,9 @@ exports.expressCreateServer = function (hook_name, args, cb) {
 
       content = `describe(${JSON.stringify(specFileName)}, function(){   ${content}   });`;
 
-      if(!specFilePath.endsWith('index.html')) res.setHeader('content-type', 'application/javascript');
-
+      if (!specFilePath.endsWith('index.html')) {
+        res.setHeader('content-type', 'application/javascript');
+      }
       res.send(content);
     });
   });
@@ -69,7 +72,7 @@ exports.expressCreateServer = function (hook_name, args, cb) {
 
 const readdir = util.promisify(fs.readdir);
 
-exports.getPluginTests = async function (callback) {
+exports.getPluginTests = async (callback) => {
   const moduleDir = 'node_modules/';
   const specPath = '/static/tests/frontend/specs/';
   const staticDir = '/static/plugins/';
@@ -88,7 +91,4 @@ exports.getPluginTests = async function (callback) {
   return Promise.all(promises).then(() => pluginSpecs);
 };
 
-exports.getCoreTests = function () {
-  // get the core test specs
-  return readdir('tests/frontend/specs');
-};
+exports.getCoreTests = () => readdir('tests/frontend/specs');