How to use the ember-cloud-firestore-adapter/instance-initializers/cloud-firestore.initialize function in ember-cloud-firestore-adapter

export default function mockCloudFirestore(owner, fixtureData) {
  initializeInstanceInitializer(owner);

  const mockFirebase = new MockFirebase();

  const mockFirebasePojo = {
    _data: fixtureData,
    initializeApp: mockFirebase.initializeApp,
    firestore: mockFirebase.firestore,
  };
  const firebaseService = Service.extend(mockFirebasePojo);

  owner.register('service:firebase', firebaseService);

  return owner.lookup('service:firebase', { as: 'firebase' });
}