给我一些网上书店系统的测试代码

以下是一个简单的网上书店系统的测试代码示例：

import unittest
from bookstore import Book, ShoppingCart, OnlineStore

class TestBook(unittest.TestCase):

    def setUp(self):
        self.book = Book('The Great Gatsby', 'F. Scott Fitzgerald', 9.99)

    def test_book_title(self):
        self.assertEqual(self.book.title, 'The Great Gatsby')

    def test_book_author(self):
        self.assertEqual(self.book.author, 'F. Scott Fitzgerald')

    def test_book_price(self):
        self.assertEqual(self.book.price, 9.99)

class TestShoppingCart(unittest.TestCase):

    def setUp(self):
        self.shopping_cart = ShoppingCart()
        self.book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', 9.99)
        self.book2 = Book('To Kill a Mockingbird', 'Harper Lee', 7.99)

    def test_add_to_cart(self):
        self.shopping_cart.add_to_cart(self.book1)
        self.assertEqual(len(self.shopping_cart.cart), 1)

    def test_remove_from_cart(self):
        self.shopping_cart.add_to_cart(self.book1)
        self.shopping_cart.add_to_cart(self.book2)
        self.shopping_cart.remove_from_cart(self.book1)
        self.assertEqual(len(self.shopping_cart.cart), 1)

    def test_calculate_total(self):
        self.shopping_cart.add_to_cart(self.book1)
        self.shopping_cart.add_to_cart(self.book2)
        total = self.shopping_cart.calculate_total()
        self.assertEqual(total, 17.98)

class TestOnlineStore(unittest.TestCase):

    def setUp(self):
        self.online_store = OnlineStore()
        self.book1 = Book('The Great Gatsby', 'F. Scott Fitzgerald', 9.99)
        self.book2 = Book('To Kill a Mockingbird', 'Harper Lee', 7.99)

    def test_add_book(self):
        self.online_store.add_book(self.book1)
        self.assertEqual(len(self.online_store.books), 1)

    def test_remove_book(self):
        self.online_store.add_book(self.book1)
        self.online_store.add_book(self.book2)
        self.online_store.remove_book(self.book1)
        self.assertEqual(len(self.online_store.books), 1)

    def test_search_books(self):
        self.online_store.add_book(self.book1)
        self.online_store.add_book(self.book2)
        results = self.online_store.search_books('Mockingbird')
        self.assertEqual(len(results), 1)
        self.assertEqual(results[0].title, 'To Kill a Mockingbird')

if __name__ == '__main__':
    unittest.main()

在这个示例中，我们使用了Python的单元测试模块来测试三个类：Book、ShoppingCart和OnlineStore。在每个测试方法中，我们创建了实例并测试了它们的各种方法和属性。通过执行unittest.main()函数，我们可以运行这些测试用例并查看测试结果。