test component helper

components.container-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  componentName: "inner-component",
  actions:  {
  	handleComponentChange() {
    	this.set('componentName', "second-component");
    }
  }
});

components.inner-component.js

import Ember from 'ember';

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

components.second-component.js

import Ember from 'ember';

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

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

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

templates.components.container-component.hbs

{{yield
  (hash
    body=(component componentName)
  )
  (hash
    onRename=(action "handleComponentChange")
  )
}}
this is container

templates.components.inner-component.hbs

{{yield}}
<p>This is child componet ahah</p>

templates.components.second-component.hbs

{{yield}}
<p>this is second one</p>

templates.index.hbs

{{#container-component
as |subComponent actions|
}}
	{{subComponent.body}}
  <button {{action actions.onRename}}>change component</button>
{{/container-component}} 

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.1.3",
    "ember-template-compiler": "3.1.3",
    "ember-testing": "3.1.3"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}