$this->assertEquals($newShelf->books()->count(), $bookChapterCount + 1);
$this->assertEquals($systemBookCount + $bookChapterCount, Book::query()->count());
$this->assertActivityExists(ActivityType::BOOKSHELF_CREATE_FROM_BOOK, $newShelf);
$this->assertEquals($newShelf->books()->count(), $bookChapterCount + 1);
$this->assertEquals($systemBookCount + $bookChapterCount, Book::query()->count());
$this->assertActivityExists(ActivityType::BOOKSHELF_CREATE_FROM_BOOK, $newShelf);