style(dummy): use class syntax

Author: buschtoens

tests/dummy/app/app.js

@@ -1,14 +1,13 @@
 import Application from '@ember/application';
-import Resolver from './resolver';
 import loadInitializers from 'ember-load-initializers';
+
 import config from './config/environment';
+import Resolver from './resolver';
 
-const App = Application.extend({
-  modulePrefix: config.modulePrefix,
-  podModulePrefix: config.podModulePrefix,
-  Resolver
-});
+export default class App extends Application {
+  modulePrefix = config.modulePrefix;
+  podModulePrefix = config.podModulePrefix;
+  Resolver = Resolver;
+}
 
 loadInitializers(App, config.modulePrefix);
-
-export default App;

tests/dummy/app/router.js

@@ -1,12 +1,10 @@
 import EmberRouter from '@ember/routing/router';
 import config from './config/environment';
 
-const Router = EmberRouter.extend({
-  location: config.locationType,
-  rootURL: config.rootURL
-});
+export default class Router extends EmberRouter {
+  location = config.locationType;
+  rootURL = config.rootURL;
+};
 
 Router.map(function() {
 });
-
-export default Router;