How to use the ember-test-helpers/wait function in ember-test-helpers

export function open (hook = 'select') {
  // In a real browser when you click on the select with your mouse a
  // focusin event is fired on the component. However when using jQuery's
  // click() method the focusin is not fired so we are programitcally
  // triggering that in this test.
  $hook(hook).click().trigger('focusin')
  return wait()
}

destItemIdx = items.indexOf(destItem) + 1;
      items.insertAt(destItemIdx, sourceItem);
    } else {
      // native array
      destItem = items[destItemIdx];
      sourceItem = items[sourceItemIdx];
      items.splice(sourceItemIdx, 1);
      destItemIdx = items.indexOf(destItem) + 1;
      items.splice(destItemIdx, 0, sourceItem);
      // if we are not using Ember Arrays we need to set `items` to a new array
      // instance to trigger a recompute on `virtualComponents`
      context.set('items', [].concat(items));
    }
  });

  return wait();
}

export default function() {
  return wait().then(() => {
    return new EmberPromise((resolve) => {
      // Two RAFs needed since we take 3 frames to do the initial render
      requestAnimationFrame(() => requestAnimationFrame((resolve)));
    });
  });
}

export function flushScrollAndWait() {
  return wait().then(() => {
    return new Ember.RSVP.Promise((resolve) => {
      window.requestAnimationFrame(resolve);
    });
  });
}

export default function(app) {
  let ctx = { app };
  Test.registerWaiter(ctx, hasNoIframe);

  return wait().then(() => {
    Test.unregisterWaiter(ctx, hasNoIframe);
    return RSVP.resolve();
  }).then(() => {
    return new RSVP.Promise(function (resolve) {
      run.later(resolve, 10);
    });
  });
}

async function testWait() {
    await wait();
}

export function replaceArray(context, items) {
  const oldItems = context.get('items');

  run(() => {
    if (EmberArray.detect(oldItems)) {
      context.set('items', A(items));
    } else {
      context.set('items', items);
    }
  });

  return wait();
}

export function append(context, itemsToAppend) {
  const items = context.get('items');

  run(() => {
    if (items.pushObjects) {
      items.pushObjects(itemsToAppend);
    } else {
      context.set('items', items.concat(itemsToAppend));
    }
  });

  return wait();
}

const hookName = `${hook}-${bunsenId}`
  const radioButtonHook = `${hookName}-radio-group-button-input`

  const defaults = {
    buttonNumber: 1
  }

  state = merge(defaults, state)

  if (state.buttonNumber === 1) {
    $hook(radioButtonHook).first().trigger('click')
  } else {
    $hook(radioButtonHook).last().trigger('click')
  }

  return wait()
}

export function close (hook = 'select') {
  $hook(hook).click().trigger('focusout')
  return wait()
}