diff --git a/test.js b/test.js
index 1877731c..659ea683 100644
--- a/test.js
+++ b/test.js
@@ -1,30 +1,31 @@
-var os = require('os')
-var path = require('path')
-var Mocha = require('mocha')
-var assign = require('./lib/util/assign')
-var klaw = require('klaw')
+'use strict'
 
-var argv = require('minimist')(process.argv.slice(2))
+const os = require('os')
+const path = require('path')
+const klaw = require('klaw')
+const Mocha = require('mocha')
+const assign = require('./lib/util/assign')
 
-var mochaOpts = assign({
+const argv = require('minimist')(process.argv.slice(2))
+
+const mochaOpts = assign({
   ui: 'bdd',
   reporter: 'dot',
   timeout: 30000
 }, argv)
 
-var mocha = new Mocha(mochaOpts)
+const mocha = new Mocha(mochaOpts)
+const testExt = '.test.js'
 
 klaw('./lib').on('readable', function () {
-  var item
+  let item
   while ((item = this.read())) {
     if (!item.stats.isFile()) return
-    if (item.path.lastIndexOf('.test.js') !== (item.path.length - '.test.js'.length)) return
+    if (item.path.lastIndexOf(testExt) !== (item.path.length - testExt.length)) return
     mocha.addFile(item.path)
   }
-}).on('end', function () {
-  mocha.run(function (failures) {
-    require('./').remove(path.join(os.tmpdir(), 'fs-extra'), function () {
-      process.exit(failures)
-    })
+}).on('end', () => {
+  mocha.run(failures => {
+    require('./').remove(path.join(os.tmpdir(), 'fs-extra'), () => process.exit(failures))
   })
 })