def test_book_cannot_return_book_if_not_checked_out(): book = Book('TITLE', 'DESCRIPTION', 'ISBN') book.check_in('BORROWER')
def test_book_cannot_return_book_if_not_borrower(): book = Book('TITLE', 'DESCRIPTION', 'ISBN') book.check_out('BORROWER') book.check_in('ANOTHER BORROWER')