public function testThatEmptyFieldsBecomeNull()
{
$book = new Book(['id' => '', 'author_id' => '1234', 'title' => 'Lorem ipsum', 'isdn' => '', 'date_published' => '']);
$this->assertNull($book->getId());
$this->assertNull($book->getIsbn());
$this->assertNull($book->getDatePublished());
}
/**
* Update a record in the database
*
* @param Book $book
* @return boolean
*/
protected function update(Book $book)
{
$sql = 'UPDATE book SET author_id =:author_id, title = :title,
isbn = :isbn, date_published = :date_published
WHERE id = :id';
$params = ['author_id' => $book->getAuthorId(), 'title' => $book->getTitle(), 'isbn' => $book->getIsbn(), 'date_published' => $book->getDatePublished(), 'id' => $book->getId()];
$statement = $this->dbAdapter->prepare($sql);
return $statement->execute($params);
}