powerMock是基于easyMock或Mockito扩展出来的增强版本，所以powerMock分两种类型，如果你习惯于使用easyMock的，那你就下载基于easyMock的powerMock，反之你喜欢用mockito的话就下载另一种PowerMock.
powerMock之所以说它更强大是因为它解决了easyMock和Mockito没有解决的问题，就是可以模仿static，private和final的方法。举例如下：
public class User{
private User user=new User();
public User(){
System.out.println("new User()");
}
public static User getInstance(){
return user;
}
private String getHello(String h)
{
return "hello "+h;
}
public String sayHello(String h)
{
return getHello(h);
}
}
public classSubUser extends User{
public SubUser(){
System.out.println("new SubUser()");
}
}
测试用例，注意以下例子需要用junit4才能运行，如是不行的话建议重下一个jar包：junit-4.0.jar
@RunWith(PowerMockRunner.class)//powerMock包里有两个PowerMockRunner，所以如果你的不能运行，请更换另一个试试 @PrepareForTest(User.class) public class TestUser extends TestCase { User user; //测试静态方法 @Test public void testVerify() { mockStatic(User.class); when(User.getInstance()).thenReturn(new SubUser()); User user=User.getInstance();
verifyStatic();
}
//测试new一个对象
@Test public void testWhenNew() { try { mockStatic(User.class); whenNew(User.class).withNoArguments().thenReturn(new SubUser()) ; user=new User(); verifyNew(User.class).withNoArguments(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }
@Test//测试私有方法 public void testPrivate() { User u = PowerMockito.spy(new User()); try { PowerMockito.doReturn("hello world").when(u, "getHello", "hello"); System.out.println(u.sayHello("hello"));
PowerMockito.verifyPrivate(u, times(1)).invoke("getHello", "hello"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }
}
输出---------------------------------
new SubUser()
new SubUser()
hello world
其它用法请参考这里：http://code.google.com/p/powermock/wiki/MockitoUsage13
以上为个人的一点经验，有可能表述有误，敬请指正
http://blog.csdn.net/Ant_cc/article/details/6977367
http://dlwt.csdn.net/fd.php?i=686345406083133&s=8d1bea4adab5d744f78c6f60e13d3624