今天測一下昨天寫的redaer事件

先註冊使用者

let mut user = Reader::default();
let service = ReaderService{};

let command = ReaderCommand::CreateReader {
    name: "John Smith".to_string(),
};
let events = user.handle(command,&service).await.unwrap();
let event = &events[0];
user.apply(event.clone());
assert_eq!(user.name, "John Smith");       // 正確註冊資訊：姓名

借閱指令

let command = ReaderCommand::BorrowBook {
    book_id: "test-book-id".to_string(),
    borrowed_date: Utc::now(),
    due_date: Utc::now().add(Duration::days(7)),
};
let events = user.handle(command,&service).await.unwrap();
let borrow_event = &events[0];
user.apply(borrow_event.clone());

assert_eq!(user.borrowed_books.len(), 1);                    // 讀者已借閱1本
assert_eq!(user.borrowed_books[0].book_id, "test-book-id");  // 確認該本 id 正確

再借同樣的書

let command = ReaderCommand::BorrowBook {
    book_id: "test-book-id".to_string(),
    borrowed_date: Utc::now(),
    due_date: Utc::now(),
};
let events = user.handle(command,&service).await;
assert!(events.is_err());                              // 確認執行沒有成功
assert_eq!(events.unwrap_err().0, "讀者已借出同一本書");  // 提示正確錯誤訊息

把書借滿

const MAX_BOOKS_PER_READER: usize = 5;
for i in 1..MAX_BOOKS_PER_READER {
    let command = ReaderCommand::BorrowBook {
        book_id: format!("test-book-id-{}", i + 1),
        borrowed_date: Utc::now(),
        due_date: Utc::now(),
    };
    let events = user.handle(command,&service).await.unwrap();
    let event = &events[0];
    user.apply(event.clone());
}
assert_eq!(user.borrowed_books.len(), MAX_BOOKS_PER_READER);

借滿後想再進行借閱操作

let command = ReaderCommand::BorrowBook {
    book_id: "test-book-id-6".to_string(),
    borrowed_date: Utc::now(),
    due_date: Utc::now(),
};
let events = user.handle(command,&service).await;
assert!(events.is_err());
assert_eq!(events.unwrap_err().0, "讀者最多只能借 5 本書");

執行還書操作

let command = ReaderCommand::ReturnBook {
    book_id: "test-book-id".to_string(),
    return_date: Utc::now(),
};
let events = user.handle(command,&service).await.unwrap();
let return_event = &events[0];
user.apply(return_event.clone());
assert_eq!(user.borrowed_books.len(), 4);                      // 借閱剩4本
assert_eq!(user.borrowed_history.len(), 1);                    // 歷史紀錄增加1筆
assert_eq!(user.borrowed_history[0].book_id, "test-book-id");  // 確認歷史紀錄正確

rollback 還書事件，回到前一狀態

user.rollback(return_event.clone());
assert_eq!(user.borrowed_books.len(), 5);
assert_eq!(user.borrowed_history.len(), 0);

rollback 借書事件，回到前一狀態

user.rollback(borrow_event.clone());
assert_eq!(user.borrowed_books.len(), 4);
assert_eq!(user.borrowed_history.len(), 0);