emberjs issue #5526

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.lesson.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: [ 'course' ],
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('lesson', function(){
    this.route('slide');
  })
});

export default Router;

routes.lesson.js

import Ember from 'ember';

export default Ember.Route.extend({
  redirect() {
    this.replaceWith('lesson.slide');
  }
});

routes.slide.js

import Ember from 'ember';

export default Ember.Route.extend({
});

templates.application.hbs

{{#link-to 'lesson' (query-params course="bla-bla")}}
   /lesson?course=bla-bla
{{/link-to}}
<br/>
{{outlet}}
<br/><br/><br/><br/><br/><br/><br/><br/>
More info – <a href="https://github.com/emberjs/ember.js/issues/5526">https://github.com/emberjs/ember.js/issues/5526</a>

templates.lesson.slide.hbs

<b>slide.hbs template rendered. Attention to the URL 👆</b>

tests.helpers.destroy-app.js

import { run } from '@ember/runloop';

export default function destroyApp(application) {
  run(application, 'destroy');
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';
import { start } from 'ember-cli-qunit';

setResolver(resolver);
start();

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}