PowerMockito测试私有void方法报错UnfinishedStubbingException

待测试代码片段：

classPowerMockitoExample{privatevoidTestPrivateMethod(){
    System.out.println("Inside private method");}publicvoidTestPublicMethod(){
    System.out.println("Inside public method");TestPrivateMethod();}}

创建测试Test类：

@RunWith(PowerMockRunner.class)publicclassPowerMockitoExampleTest{@Testpublicvoidtest()throws Exception{

 PowerMockitoExample testclass= PowerMockito.spy(newPowerMockitoExample());
 PowerMockito.doNothing().when(testclass,"TestPrivateMethod");
 testclass.TestPublicMethod();}

运行后报错：

org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here:-> at...

E.g.thenReturn() may be missing.
Examples of correct stubbing:when(mock.isOk()).thenReturn(true);when(mock.isOk()).thenThrow(exception);doThrow(exception).when(mock).someVoidMethod();
Hints:1. missingthenReturn()2. you are trying to stub afinal method, which is not supported3: you are stubbing the behaviour of another mock inside before'thenReturn' instruction is completed


at...

解决：
除了要PowerMockito.spy()对象以外
还必须在@RunWith批注之后使用@PrepareForTest添加类名称！！！

@RunWith(PowerMockRunner.class)@PrepareForTest({PowerMockitoExample.class, xxx.class})publicclassPowerMockitoExampleTest{...}