scroll-listener-test-failing

components.my-component.js

import Ember from 'ember';

const { computed } = Ember;

export default Ember.Component.extend({
  classNames: ['my-component'],
  classNameBindings: ['show'],

  show: computed({
    get() {
      return false;
    },
    set(key, value) {
      if (value) {
        this.addScrollListener();
      } else {
        this.removeScrollListener();
      }
      return value;
    }
  }),
  
  onScroll() {
    console.log('scrolling...');
    this.set('show', false);
  },
  
  _scrollElement: computed(function() {
  	return window;
  }),

  addScrollListener() {
    this._listener = Ember.run.bind(this, this.onScroll);
    this.get('_scrollElement').addEventListener('scroll', this._listener, false);
  },

  removeScrollListener() {
    this.get('_scrollElement').removeEventListener('scroll', this._listener, false);
  },
  
  actions: {
    addClass() {
      this.set('show', true);
    }
  },
  
  willDestroyElement() {
  	this._super(...arguments);
    this.removeScrollListener();
  }

});

controllers.application.js

import Ember from 'ember';

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

controllers.my-route.js

import Ember from 'ember';

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

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
  height: 3000px;
}

.my-component.show {
  background-color: red;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
{{my-component}}

templates.components.my-component.hbs

My component
<br>
<br>
<button {{action "addClass"}}>Add class</button>

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.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.integration.components.my-component-test.js

import { moduleForComponent, test } from 'ember-qunit';
import hbs from 'htmlbars-inline-precompile';

moduleForComponent('my-component', 'TODO: put something here', {
  integration: true
});

test('it renders', function(assert) {
  this.render(hbs`{{my-component}}`);
  assert.equal(this.$().is(":visible"), true);
});

test('it should add class when we click on button', function(assert) {
	this.render(hbs`{{my-component}}`);
  assert.ok(this.$('div').hasClass('my-component'));
  assert.notOk(this.$('div').hasClass('show'));
  this.$('button').click();
  assert.ok(this.$('div').hasClass('show'));
});

test('it should remove the class when we start scrolling', function(assert) {
  this.set('element', document.getElementById('ember-testing-container'));
	this.render(hbs`<div style="height: 3000px;">{{my-component _scrollElement=element}}</div>`);
  this.$('button').click();
  assert.ok(this.$('div').hasClass('show'));
  this.get('element').scrollTop = 400;
  assert.equal(this.get('element').scrollTop, 400)
  
  let done = assert.async();
  setTimeout(function() {
  	assert.notOk(this.$('div').hasClass('show'));
    done()
  }, 0);
});

tests.test-helper.js

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

setResolver(resolver);

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}