New Twiddle

components.the-checkbox\.js

import Component from '@ember/component';

export default Component.extend({
  toRemove: true,
	actions:{
    updateRemove(){
      console.log(this.get('toRemove'));
    }
  }
});

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Checkbox test';
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
{{the-checkbox}}
<br>
<br>

templates.components.the-checkbox\.hbs

{{input type='checkbox' checked=toRemove change=(action 'updateRemove')}}
The value : {{toRemove}}

tests.test-helper\.js

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { assign } from '@ember/polyfills';
import { start } from 'ember-qunit';

let attributes = {
  rootElement: '#test-root',
  autoboot: false
};
attributes = assign(attributes, config.APP);

let application = Application.create(attributes);
setApplication(application);

start();

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "2.17.2",
    "ember-template-compiler": "2.17.2",
    "ember-testing": "2.17.2"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "2.17.1"
  }
}