$this->actingAs($newUser);
$entities = $this->createEntityChainBelongingToUser($newUser, $newUser);
\Activity::add($entities['book'], 'book_update', $entities['book']->id);
$this->actingAs($newUser);
$entities = $this->createEntityChainBelongingToUser($newUser, $newUser);
\Activity::add($entities['book'], 'book_update', $entities['book']->id);