单元测试遇到的坑

1. 使用Mockito来来模拟外部依赖的对象，完成单元测试。结果发现when(mock.someMethod()).thenReturn 对static修饰的方法是无法设置方法调用的预期返回，与我所需的单元测试不符合。遂改用PowerMockito，PowerMock扩展了EasyMock和Mockito框架，增加了对static、final和pricvate方法mock支持等功能。

2. 改用PowerMockito：
   PowerMockito.mockStatic(HttpTest.class);
   PowerMockito.when(HttpTest.doPost(requestOc,request,1000*20)).thenReturn(response);
   报错为：
   org.powermock.api.mockito.ClassNotPreparedException:
   The class com.sf.cx.util.HttpTest not prepared for test.
   To prepare this class, add class to the ‘@PrepareForTest’ annotation.
   In case if you don’t use this annotation, add the annotation on class or method level.
   解决办法是加上，@RunWith(PowerMockRunner.class) @PrepareForTest(HttpTest.class)

   这是PowerMock的两个重要的注解：
   @RunWith(PowerMockRunner.class)语句告诉JUnit用PowerMockRunner来执行测试。
   @PrepareForTest(Employee.class)语句告诉PowerMock准备Employee类进行测试。适用于模拟final类或有final, private, static, native方法的类。