erjs.com/classes/Ember.Test.html#method_registerAsyncHelper"><code>Ember.Test.registerAsyncHelper</code></a> and <a href="https://api.emberjs.com/classes/Ember.Test.html#method_registerHelper"><code>Ember.Test.registerHelper</code></a>
are used to register test helpers that will be injected when <code>startApp</code> is
called. The difference between <code>Ember.Test.registerHelper</code> and
<code>Ember.Test.registerAsyncHelper</code> is that the latter will not run until any
previous async helper has comp