--- a/common/corpus-common-addon/tests/dummy/config/environment.js	Fri Sep 08 12:04:21 2017 +0200
+++ b/common/corpus-common-addon/tests/dummy/config/environment.js	Fri Sep 08 15:03:29 2017 +0200
@@ -1,9 +1,10 @@
 /* eslint-env node */
+'use strict';
 
 module.exports = function(environment) {
-  var ENV = {
+  let ENV = {
     modulePrefix: 'dummy',
-    environment: environment,
+    environment,
     rootURL: '/',
     locationType: 'auto',
     EmberENV: {