ember-test-selectors/issues/279

templates.application.hbs

<h1>ember-test-selectors and ...attributes</h1>
<p>Have a look at the markup generated by this component.</p>
<MyComponent data-test-foo="bar" class="test" />

templates.components.my-component.hbs

<p ...attributes>
  some content
</p>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-test-selectors": "2.0.0"
  }
}