easymock快速入门

　　easymock是众多mock之中的很容易用的mock,今天刚开始学习,来个简单的教程.以购物车结算为例子,比如首先是每一个商品项的pojo。

 1 public class Item {  
 2   
 3     private String name;  
 4     private int quantity;  
 5       
 6     public Item(String name, int quantity) {  
 7         super();  
 8         this.name = name;  
 9         this.quantity = quantity;  
10     }  
11     public String getName() {  
12         return name;  
13     }  
14     public void setName(String name) {  
15         this.name = name;  
16     }  
17     public int getQuantity() {  
18         return quantity;  
19     }  
20     public void setQuantity(int quantity) {  
21         this.quantity = quantity;  
22     }  
 1 public class ShoppingCart {  
 2       
 3     private String name;  
 4     private Store store = null;  
 5       
 6     private List<Item> items = new ArrayList();  
 7   
 8     public String getName() {  
 9         return name;  
10     }  
11   
12     public void setName(String name) {  
13         this.name = name;  
14     }  
15   
16     public List<Item> getItems() {  
17         return items;  
18     }  
19   
20     public void setItems(List<Item> items) {  
21         this.items = items;  
22     }  
23       
24       
25     public void addItem(Item item)  
26     {  
27         items.add(item);  
28     }  
29   
30       
31     public void setStore(Store store)  
32     {  
33         this.store=store;  
34     }  
35       
36     public Store getStore()  
37     {  
38         return (this.store);  
39     }  
40       
41     public Double calculateTotal()  
42     {  
43         Double total = 0.0;  
44          for (Item item : this.items) {  
45          total+= (store.getPrice(item.getName()) * item.getQuantity());  
46         }  
47            
48          DecimalFormat decim = new DecimalFormat("0.00");  
49          Double price = Double.parseDouble(decim.format(total));  
50               
51          return price;  
52     }

　　在这个购物车的计算中,在计算总价格方面, total+= (store.getPrice(item.getName()) * item.getQuantity());这里,依赖了一个额外的对象store,根据store.getPrice()方法求出某个商品的单价, 但这里模拟的是现在根本不知道这个store 是如何实现的,有可能是第三方的,于是 easymock就派上用长了,它可以根据接口去模拟一个实现出来,下面直接看 
　　ShoppingCartTest .java 

 1 public ShoppingCart cart = null;  
 2     public Store storeMock = null;  
 3       
 4     @Before  
 5     public void initialize()  
 6     {     
 7         cart = new ShoppingCart();  
 8         storeMock = EasyMock.createMock(Store.class);  
 9         cart.setStore(storeMock);  
10     }  
11       
12       
13     @Test       
14     public void testShoppingCart()  
15     {  
16       
17           
18         EasyMock.expect(storeMock.getPrice("Mead Spiral Bound Notebook, College Rule")).andReturn(5.99);  
19         EasyMock.expect(storeMock.getPrice("Kindle Fire HD 8.9")).andReturn(499.99);  
20           
21             //开始使用mock  
22         EasyMock.replay(storeMock);  
23                   
24         Item item1 = new Item("Mead Spiral Bound Notebook, College Rule", 3);  
25         Item item2 = new Item("Kindle Fire HD 8.9",1);  
26           
27         cart.addItem(item1);  
28         cart.addItem(item2);  
29           
30         double total = cart.calculateTotal();  
31           
32         System.out.println("Total price of items in shopping cart: $"+total);  
33         assertEquals("Result",505.96, total,0);  
34     }  
35       
36     @After  
37     public void cleanup()   
38     {  
39         cart=null;  
40         storeMock=null;  
41     }

　　junit一样,在before中, 

1 @Before 
2 public void initialize() 
3 {    
4 cart = new ShoppingCart(); 
5 storeMock = EasyMock.createMock(Store.class); 
6 cart.setStore(storeMock); 
7 }    

　　storeMock = EasyMock.createMock(Store.class);就可以模拟一个实现出来了, 
  　　然后 
　　EasyMock.expect(storeMock.getPrice("Mead Spiral Bound Notebook, College Rule")).andReturn(5.99); 这里,使用easymock的断言机制,断言出这个属的单价是5.99,然后记得使用 .EasyMock.replay(storeMock);就可以在真正的测试中,使用store这个对象了;最后记得cleanup中清理下.

posted @ 2017-02-28 15:13  ngulc  阅读(875)  评论(0)  编辑  收藏  举报