EC lastSuccessful Test

controllers.application\.js

import Controller from '@ember/controller';
import { timeout } from "ember-concurrency";
import { task, lastValue } from "ember-concurrency-decorators";

export default class ApplicationController extends Controller {
  wasCalled = false;

  @lastValue('myTask') value = "Not Yet Started";

  @task myTask = function* () {
    if (this.wasCalled) {
      return "Last To Start";
    } else {
      this.wasCalled = true;
      
      this.myTask.perform();
      yield timeout(1000);
      return "Last To Complete"
    }
  }
}

templates.application\.hbs

<h1>Ember Concurrency <code>lastSuccessful</code></h1>
<p>Which is considered the "last successful" task instance?</p>

<ol>
  <li>The last one <i>started</i> that exited successfully?</li>
  <li>The last one <i>to successfully complete</i>?</li>
</ol>

<hr>

Value: {{if this.myTask.isRunning "Running..." this.value}}

<br><br>

<button {{on "click" (perform this.myTask)}} disabled={{eq this.myTask.performCount 2}}>
  Start Task
</button>

twiddle\.json

{
  "version": "0.17.0",
  "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/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-concurrency": "1.1.7",
    "ember-concurrency-decorators": "1.0.0",
    "ember-truth-helpers": "2.1.0"
  }
}