easymock快速入门

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　　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.

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