Mockito：模拟类始终调用真实方法

Question

I would like to mock a class.

The class is called like this:

here's my code:

@Mock
SomeClass someClass;

@InjectMocks
ToBeTested toBeTested;

@Before
public void setUp() {
    MockitoAnnotations.initMocks(this);
}

// in the test:
doReturn(returnValue).when(someClass).doSomething(param1, param2); 

I feel like I have tried every possible combination of @Mock and @Spy and doReturn and when , but instead of mocking the method call, the real method is called and an NPE is thrown.

How do I do this correctly?

I'll provide more code if needed.

EDIT

both SomeClass and doSomething() are public and neither are final.

I tried using MockitoJunitRunnerclass instead of MockitoAnnotations and the exception is still thrown.

The class to be tested:

@Component
public class ToBeTested implements Something {

    @Override
    public ReturnValue doSomeAction(Parameter theParam) {
        try {
            SomeClass theClass = new SomeClass();
            MyReturnValue myReturnValue = theClass.doSomething(
                    parameterOfTypeInputStream,
                    parameterOfTypeString
            );

        // other stuff

            return theParam;
        } catch (IOException e) {
            throw new RuntimeException("Oh no!");
        }
    }

// more

param1 and param2 are of type InputStream and String respectively.

Answer 1

Of course it's not mocked, the actual code create the real class in the method doSomeAction , in order to have the mock injected SomeClass theClass should be a field.

@Component
public class ToBeTested implements Something {
    SomeClass theClass;

    @Autowired
    public ToBeTested(SomeClass theClass) {
        this.theClass = theClass;
    }    

    @Override
    public ReturnValue doSomeAction(Parameter theParam) {
        try {
            MyReturnValue myReturnValue = theClass.doSomething(
                    parameterOfTypeInputStream,
                    parameterOfTypeString
            );

        // other stuff

            return theParam;
        } catch (IOException e) {
            throw new RuntimeException("Oh no!");
        }
    }

You application container (Spring) should create the bean SomeClass and inject it as this constructor is annotated by @Autowired .

And since Mockito's @InjectMocks annotation will look up constructors, it will find this constructor and inject the mock you declared in your test class ( @Mock SomeClass someClass; ).