测试 | Mock object
2024-09-30 02:06:51
实例：
一个简单的图书管理系统包括三个类：
- Book提供了书籍的定义
- BookService提供了有关书籍借阅和归还的服务
- BookMananger查找书籍并把对书籍状态的更改更新到数据库中
目前，Book类和Bookservice类都已完成，但BookManager只是一个接口，对它的实现还没有完成。
目标： 对BookService类中的borrowBook和returnBook两个方法进行单元测试的代码，要求使用EasyMock模拟BookManager对象。
package org.demo.test.library;
public class Book {
private String name;
private String isbn; //书号
private double price;
private boolean inShell; // 是否在架上
public Book(){}
public Book(String name, String isbn, double price,
boolean inShell){
this.name = name;
this.isbn = isbn;
this.price = price;
this.inShell = inShell;
}
/**
* get set方法省略
**/
public boolean isInShell(){
return this.inShell;
}
public void setInShell(boolean inShell){
this.inShell = inShell;
}
}
package org.demo.test.library;
public class BookService {
private BookManager bookManager;
public BookService(BookManager bookManager){
this.bookManager = bookManager;
}
public boolean borrowBook (String isbn){
Book book = bookManager.findBook(isbn);
if (book != null && book.isInShell()){
//修改shell值
book.setInShell(false);
bookManager.updateBook(book);
return true;
}
return false;
}
public boolean returnBook (String isbn){
Book book = bookManager.findBook(isbn);
if (book != null && !book.isInShell()){
book.setInShell(true);
return true;
}
return false;
}
}
package org.demo.test.library;
public interface BookManager {
Book findBook(String isbn); // 根据isbn在数据库中找到相应的书籍
void updateBook(Book book); // 更新数据库中书籍的状态
}
package org.demo.test.library; import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.replay;
import static org.junit.Assert.*; import org.demo.test.account.AccountManager;
import org.junit.Before;
import org.junit.Test;
import org.junit.rules.ExpectedException; public class BookServiceTest { private BookManager bookManager;
private BookService bookService; @Before
public void setUp() throws Exception {
bookManager = createMock("bookManager",BookManager.class); bookService = new BookService(bookManager); } @Test
public void testBorrowBook() {
Book book1 = new Book("Java","123",20.2,true);
Book book2 = new Book("Web","124",20.9,false);
Book book3 = new Book("JavaScript","125",20.9,false); bookManager.updateBook(book1);
bookManager.updateBook(book2); /**
* 定义查询接口返回值
*/
expect(bookManager.findBook("123")).andReturn(book1);
expect(bookManager.findBook("124")).andReturn(book2);
expect(bookManager.findBook("126")).andReturn(null); /**
*
*/
replay(bookManager); /**
* 执行测试
*/
bookService.borrowBook("123");
bookService.borrowBook("124");
bookService.borrowBook("126"); assertEquals(false, book1.isInShell());
assertEquals(false, book2.isInShell());
} @Test
public void testReturnBook() {
Book book1 = new Book("Java","123",20.2,true);
Book book2 = new Book("Web","124",20.9,false); bookManager.updateBook(book1);
bookManager.updateBook(book2); expect(bookManager.findBook("123")).andReturn(book1);
expect(bookManager.findBook("124")).andReturn(book2);
expect(bookManager.findBook("126")).andReturn(null); replay(bookManager); bookService.returnBook("123");
bookService.returnBook("124");
bookService.returnBook("126"); assertEquals(true, book1.isInShell());
assertEquals(true, book2.isInShell()); }
}
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