Upgrade to Babel 6

test/javascripts/helpers/qunit-helpers.js.es6

@@ -40,7 +40,7 @@ window.bootbox.$body = $('#ember-testing');
 $.fn.modal = AcceptanceModal;
 
 function acceptance(name, options) {
-  module("Acceptance: " + name, {
+  QUnit.module("Acceptance: " + name, {
     beforeEach() {
       resetMobile();
 

test/javascripts/initializers/localization-test.js.es6

@@ -34,10 +34,10 @@ QUnit.module("initializer:localization", {
   }
 });
 
-QUnit.test("translation overrides", assert => {
+QUnit.test("translation overrides", function(assert) {
   PreloadStore.store('translationOverrides', {"js.composer.reply":"WAT","js.topic.reply.help":"foobar"});
   LocalizationInitializer.initialize(this.registry);
 
   assert.equal(I18n.t("composer.reply"), "WAT", "overrides existing translation in current locale");
   assert.equal(I18n.t("topic.reply.help"), "foobar", "overrides translation in default locale");
-});
+});

test/javascripts/mdtest/mdtest.js.es6.erb

@@ -3,7 +3,7 @@ import { default as PrettyText, buildOptions } from 'pretty-text/pretty-text';
 import { hashString } from 'discourse/lib/hash';
 
 // Run the MDTest spec
-module("MDTest");
+QUnit.module("MDTest");
 
 // This is cheating, but the trivial differences between sanitization
 // do not affect formatting.