def test_create_book_with_invalid_isbn_raises_error(self):
publisher = PublisherFactory()
author = AuthorFactory()
new_book = Book(
author=author, publisher=publisher, isbn='ISBN', title='Test book'
)
with self.assertRaises(ValidationError):
new_book.save()
new_book.full_clean()
def test_cannot_save_book_without_author(self):
book = Book(title="Test book", year=2000)
with self.assertRaises(ValidationError):
book.full_clean()
def test_cannot_save_empty_book(self):
book = Book()
with self.assertRaises(ValidationError):
book.full_clean()
