Testing route transition

controllers.application.js

import Ember from 'ember';

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

router.js

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

const Router = EmberRouter.extend({
    location: config.locationType,
    rootURL: config.rootURL
});

Router.map(function() {
    this.route('passing-route');
    this.route('failing-route');
});

export default Router;

routes.failing-route.js

import Route from '@ember/routing/route';
import { Promise as EmberPromise } from 'rsvp';

export default Route.extend({
  model() {
    return new EmberPromise((resolve) => {
      setTimeout(() => {
        resolve('Should fail');
      }, 1);
    });
  }
});

routes.passing-route.js

import Route from '@ember/routing/route';
import { Promise as EmberPromise } from 'rsvp';

export default Route.extend({
  model() {
    return EmberPromise.resolve('Should pass');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.failing-route.hbs

{{#link-to "passing-route" class="passing-route-link"}}Go to passing route{{/link-to}}

templates.passing-route.hbs

{{#link-to "failing-route" class="failing-route-link"}}Go to failing route{{/link-to}}

tests.acceptance.passing-route-test.js

import { module, test } from 'qunit';
import { setupApplicationTest } from 'ember-qunit';
import { currentRouteName, visit } from '@ember/test-helpers';

module('acceptance | plans/import', function(hooks) {
    setupApplicationTest(hooks);
  
    test('visiting /passing-route', async function(assert) {
      await visit('/passing-route');

      assert.equal(currentRouteName(), 'passing-route');
      
    });
});

tests.helpers.destroy-app.js

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

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

tests.helpers.module-for-acceptance.js

import { module } from 'qunit';
import { resolve } from 'rsvp';
import startApp from '../helpers/start-app';
import destroyApp from '../helpers/destroy-app';

export default function(name, options = {}) {
  module(name, {
    beforeEach() {
      this.application = startApp();

      if (options.beforeEach) {
        return options.beforeEach.apply(this, arguments);
      }
    },

    afterEach() {
      let afterEach = options.afterEach && options.afterEach.apply(this, arguments);
      return resolve(afterEach).then(() => destroyApp(this.application));
    }
  });
}

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": true
  },
  "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"
  }
}