pa

components.inputs\.js

import Component from '@glimmer/component';

export default class extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class ApplicationController extends Controller {
  appName = 'particial appliance';
  @tracked currentIndex = 0;
  inputCounts = [1, 2, 3];
   
  @action selectIndex(event) {
     this.currentIndex = Number(event.target.value);
  }


}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<select value={{this.currentIndex}} {{on "change" this.selectIndex}}>
  {{#each this.inputCounts as |count index|}}
    <option value={{index}}>{{count}}</option>
  {{/each}}
</select>
<pre>{{this.currentIndex}}</pre>
<Inputs @count={{get this.inputCounts this.currentIndex}} />

templates.components.inputs\.hbs

{{#each @counts as |count|}}
<pre>herobora</pre>
{{/each}}

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": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}