PowerMokito 1.7.4 @Spy注释不起作用

Question

我正在将TestNg与PowerMocktion 1.7.4一起使用。 @Spy无法正常工作。 抛出异常

  

org.mockito.exceptions.base.MockitoException：无法为创建@Spy   “服务”字段，因为缺少 instance

正确使用@Spy的示例：

@Spy List mock = new LinkedList();

@PrepareForTest(StaticClass.class)
public class UsingPowerMockTest extends PowerMockTestCase {

@Spy
ServiceTest service;

@BeforeMethod
public void before() throws Exception {

    //service = PowerMockito.spy(new ServiceTest());
    mockStatic(StaticClass.class);
}



@Test
public void should_mock_static_method() {

    PowerMockito.when(StaticClass.randomGenerator(Mockito.anyInt())).thenReturn("asd");
    String randomString = service.getRandomString(20);
    System.out.println(randomString);

}

}