https://github.com/emberjs/ember.js/issues/14071#issuecomment-240001194

components.card-thingy.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['card-thingy'],
  
  click() {
    this.sendAction('transitionToMyRoute'); 
  }
});

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: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('my-route');
  this.route('my-other-route');
});

export default Router;

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    transitionToMyRoute() {
      this.transitionTo('my-route');
    }
  }
});

routes.my-route.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Click action + link-to different behavior in tests</h1>

<p>I noticed this difference between the actually using the app vs. in test. In this case, I have a button inside a component that goes to a different route than the component itself. We could argue about the UX, but that's another story. If you interact with the real component, clicking the button goes to a different route, but this behavior is different in test.</p>

<br>
<br>
{{outlet}}
<br>
<br>

templates.components.card-thingy.hbs

<div style='height: 200px; width: 200px; cursor: pointer; border: 1px black solid;'>
  Click anywhere in this card to go to my-route.
  
  {{#link-to 'my-other-route' tagName='button'}}Click here to go to my-other-route{{/link-to}}
</div>

templates.index.hbs

{{card-thingy transitionToMyRoute='transitionToMyRoute'}}

templates.my-other-route.hbs

<h1>On "my-other-route"</h1>

{{#link-to 'index'}} Back {{/link-to}}

templates.my-route.hbs

<h1>On "my-route"</h1>

{{#link-to 'index'}} Back {{/link-to}}

tests.acceptance.my-acceptance-test.js

import { test } from 'qunit';
import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';

moduleForAcceptance('Behavior');

test('visiting /my-acceptance', function(assert) {
  visit('/');
  click('.card-thingy');

  andThen(function() {
    assert.equal(currentURL(), '/my-route');
  });
});

test('clicking the button', function(assert) {
  visit('/');
  click('.card-thingy button');

  andThen(function() {
    assert.equal(currentURL(), '/my-other-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"
  }
}