How to mock instance variable of class?

Question

How do i mock the variables instantiated at class level..I want to mock GenUser,UserData. how do i do it...

I have following class

public class Source {

private  GenUser v1 = new GenUser();

private  UserData v2 = new UserData();

private  DataAccess v3 = new DataAccess();

public String createUser(User u) {
    return v1.persistUser(u).toString();
    }
}

how do i mocked my v1 is like this

GenUser gu=Mockito.mock(GenUser.class);
PowerMockito.whenNew(GenUser.class).withNoArguments().thenReturn(gu);

what i have written for unit test and to mock is that

@Test
public void testCreateUser() {
    Source scr = new Source();
    //here i have mocked persistUser method
    PowerMockito.when(v1.persistUser(Matchers.any(User.class))).thenReturn("value");
    final String s = scr.createUser(new User());
    Assert.assertEquals("value", s);
}

even if i have mocked persistUser method of GenUser v1 then also it did not return me "Value" as my return val.

thanks in adavanced.......:D

Answer 1

As in fge's comment:

All usages require @RunWith(PowerMockRunner.class) and @PrepareForTest annotated at class level.

Make sure you're using that test runner, and that you put @PrepareForTest(GenUser.class) on your test class.

(Source: https://code.google.com/p/powermock/wiki/MockitoUsage13)