测试与集成

本课属于 Coddy Python 学习旅程的“面向对象编程”单元。第 60 课，共 64 课。

挑战

中等

在这个挑战中，你将实现一个多文件图书馆系统，并为它编写全面的测试。你将使用 3 个只读文件和 1 个可编辑文件，其中包含详细的 TODO 注释，为你的实现提供指导：

book.py：包含 Book 类的定义
user.py：包含你需要实现的 User 类
library.py：包含 Library 类的定义

亲手试试

from book import Book
from user import User
from library import Library

# 测试用例处理程序
test_case = input()

if test_case == "create_user":
    user_id = "1"
    name = "Name"
    
    user = User(user_id, name)
    print(user)
    print(f"Books borrowed: {len(user.books_borrowed)}")

elif test_case == "borrow_and_return_all":
    library = Library("Community Library")
    
    # 添加图书和用户
    library.add_book(Book("The Great Gatsby", "F. Scott Fitzgerald", "123456"))
    library.add_book(Book("To Kill a Mockingbird", "Harper Lee", "789012"))
    library.add_book(Book("1984", "George Orwell", "345678"))
    
    user = User("U001", "Alice")
    library.add_user(user)
    
    # 借阅图书
    library.borrow_book("123456", "U001")
    library.borrow_book("789012", "U001")
    library.borrow_book("345678", "U001")
    
    print(f"Books borrowed before: {len(user.books_borrowed)}")
    
    # 归还所有图书
    num_returned = user.return_all_books(library)
    
    print(f"Books returned: {num_returned}")
    print(f"Books borrowed after: {len(user.books_borrowed)}")
    
    # 检查所有图书是否可借
    for book in library.books:
        print(f"Book {book.isbn} available: {book.available}")

elif test_case == "return_some_books":
    library = Library("Community Library")
    
    # 添加图书和用户
    book1 = Book("The Great Gatsby", "F. Scott Fitzgerald", "123456")
    book2 = Book("To Kill a Mockingbird", "Harper Lee", "789012")
    library.add_book(book1)
    library.add_book(book2)
    
    user = User("U001", "Alice")
    library.add_user(user)
    
    # 只借阅一本书
    library.borrow_book("123456", "U001")
    
    print(f"Books borrowed before: {len(user.books_borrowed)}")
    
    # 归还所有图书
    num_returned = user.return_all_books(library)
    
    print(f"Books returned: {num_returned}")
    print(f"Books borrowed after: {len(user.books_borrowed)}")

elif test_case == "empty_return":
    library = Library("Community Library")
    
    user = User("U001", "Alice")
    library.add_user(user)
    
    print(f"Books borrowed: {len(user.books_borrowed)}")
    
    # 归还所有图书（应为 0）
    num_returned = user.return_all_books(library)
    
    print(f"Books returned: {num_returned}")

elif test_case == "multiple_users":
    library = Library("Community Library")
    
    # 添加图书
    library.add_book(Book("The Great Gatsby", "F. Scott Fitzgerald", "123456"))
    library.add_book(Book("To Kill a Mockingbird", "Harper Lee", "789012"))
    
    # 添加用户
    user1 = User("U001", "Alice")
    user2 = User("U002", "Bob")
    library.add_user(user1)
    library.add_user(user2)
    
    # 借阅图书
    library.borrow_book("123456", "U001")
    library.borrow_book("789012", "U002")
    
    print(user1)
    print(user2)
    
    # 归还 user1 借阅的所有图书
    num_returned = user1.return_all_books(library)
    
    print(f"Books returned by {user1.name}: {num_returned}")
    
    print(user1)
    print(user2)

elif test_case == "error_handling":
    library = Library("Community Library")
    
    # 添加图书和用户
    library.add_book(Book("The Great Gatsby", "F. Scott Fitzgerald", "123456"))
    user = User("U001", "Alice")
    library.add_user(user)
    
    # 尝试借阅不存在的图书
    result = library.borrow_book("999999", "U001")
    print(result)
    
    # 尝试为不存在的用户借书
    result = library.borrow_book("123456", "U999")
    print(result)
    
    # 借一本现有的书
    result = library.borrow_book("123456", "U001")
    print(result)
    
    # 尝试再次借同一本书
    result = library.borrow_book("123456", "U001")
    print(result)
    
    # 尝试归还一本未借出的书
    result = library.return_book("789012", "U001")
    print(result)

elif test_case == "stress_test":
    library = Library("Community Library")
    
    user = User("U001", "Alice")
    library.add_user(user)
    
    # 添加 100 本书
    for i in range(1, 101):
        isbn = f"{i:03d}"  # 格式化为 001、002 等
        library.add_book(Book(f"Book {i}", f"Author {i}", isbn))
        library.borrow_book(isbn, "U001")
    
    print(f"Books borrowed: {len(user.books_borrowed)}")
    
    # 归还所有图书
    num_returned = user.return_all_books(library)
    
    print(f"Books returned: {num_returned}")
    print(f"Books borrowed after: {len(user.books_borrowed)}")