def test19_bookcoll_pop_not_found_success(self):
book_collection = BookCollection(**self.valid_bookcoll_kwargs)
self.assertFalse(book_collection.pop(self.test_book1.isbn, None),
self.test_book1)
def test18_bookcoll_pop_success(self):
book_collection = BookCollection(**self.valid_bookcoll_kwargs)
book_collection[self.test_book1.isbn] = self.test_book1
self.assertEqual(book_collection.pop(self.test_book1.isbn),
self.test_book1)