Mockito/PowerMockito: mock final static member cannot return different values in different methods

Question

There is a final static member in class ToBeTestClass:

protected final static LMSServiceHelper externalService;

I mock it with

@Mock
protected LMSServiceHelper externalService;

Then I want to get different values in different test methods:

public void testMethod1() {
    PowerMockito.when(externalService.getSomething).thenReturn("aaa");
}

public void testMethod2() {
    PowerMockito.when(externalService.getSomething).thenReturn("bbb");
}

public void testMethod3() {
    PowerMockito.when(externalService.getSomething).thenReturn("ccc");
}

However, I can't get "bbb" or "ccc" whereas always get "aaa". It seems when I set the return value first time, and it will never changes.

Anyone has met this?

Could you please give a **full** [mcve]. And alone the idea of using a **static** field in in inheritance context (protected) ... sounds strange. I would rather look into changing production code here. — GhostCat, Sep 21 '17 at 04:23

score 1 · Accepted Answer · answered Nov 22 '17 at 06:26

@Before
public void setUp() {
    Mockito.when(externalService.getSomething)
           .thenReturn("aaa")
           .thenReturn("ccc")
           .thenReturn("ccc"); //any subsequent call will return "ccc"
}

How to tell a Mockito mock object to return something different the next time it is called?

score 0 · Answer 2 · answered Sep 21 '17 at 07:21

0

Reset your mocked object as shown below then you will see different values

public void testMethod1() {
PowerMockito.when(externalService.getSomething).thenReturn("aaa");
Mockito.reset(externalService);

}

public void testMethod2() {
    PowerMockito.when(externalService.getSomething).thenReturn("bbb");
    Mockito.reset(externalService);

}


public void testMethod3() {
    PowerMockito.when(externalService.getSomething).thenReturn("ccc");

    Mockito.reset(externalService);

}

answered Sep 21 '17 at 07:21

Praveen Kumar Mekala

628
1
10
26

I finally resolved the issue by using `when(someMock.someMethod()).doReturn("aaa").doReturn("bbb").doReturn("ccc"));` – csujiabin Nov 22 '17 at 06:22
Sorry. I tried the reset, but it doesn't work. They always return "aaa". – csujiabin Nov 25 '17 at 07:43

Mockito/PowerMockito: mock final static member cannot return different values in different methods

2 Answers2