Ember concurrency timeout hanging in qunit

In Ember I have a component that starts a never-ending poll to keep some data up to date. Like so:

export default Component.extend({
  pollTask: task(function * () {
    while(true) {
      yield timeout(this.get('pollRate'));
      this.fetchSomeData();
    }
  }).on('init')
})

This causes a preexisting acceptance test to get stuck in this task and run forever, even though it should be run asynchronously. The test looks like this:

test('my test', async function(assert) {
  mockFindRecord(make('fetched-model'));

  await visit('/mypage'); // gets stuck here
  await typeIn('input', 'abc123');

  assert.ok(somethingAboutThePage);
});

I thought at first that I had mocked the request wrong and that the test was just timing out, but it was in fact correctly polling data. Removing this task makes the acceptance test finish normally.

Testing this manually seems to work fine, and nothing gets stuck. Why is this happening and what is the right way to address this?

Saw Unit testing ember-concurrency tasks and yields but it doesn't really help since it only deals with unit tests.