Define expectations for public final instance variable

Question

I'm new at unit testing and am running into an issue with jMock that I can't seem to figure out. I have a public final instance variable which I need to define an expectation for, but I can't get it to work. If I make a getter for the variable, it works, but I'd rather not have to create a bunch of getters just to make unit testing work. Any help on how to do this would be much appreciated. Here's some code illustraiting what I'm trying to do:

public class Main {
    private SimpleObject simpleObject;

    public Main(SimpleObject o){
        this.simpleObject = o;
    }

    public int iDontWork(){
        return simpleObject.myList.size();
    }

    public int iWork(){
        return simpleObject.getMyList().size();
    }
}

My test:

@RunWith(JMock.class)
public class MainTest {
    Mockery context = new Mockery() {{
        setImposteriser(ClassImposteriser.INSTANCE);
    }};
    @Mock
    SimpleObject simpleObject;
    private Main main;

    @Before
    public void setup(){
        main = new Main(simpleObject);
    }

    @Test
    public void itWorks() {
        context.checking(new Expectations() {{
            oneOf(simpleObject).getMyList(); 
            will(returnValue(new ArrayList<String>(Arrays.asList("Hey"))));
        }});
        int i = main.iWork();
        assertEquals(1, i);
    }

    @Test
    public void itDoesntWork() {
        context.checking(new Expectations() {{
            oneOf(simpleObject).myList.size(); will(returnValue(1));
        }});
        int i = main.iDontWork();
        assertEquals(1, i);
    }
}

SimpleObject:

public class SimpleObject {
    public final List<String> myList;

    public SimpleObject(){
        myList = Collections.unmodifiableList(Arrays.asList("Hey"));
    }

    public List<String> getMyList(){
        return myList;
    }
}

Answer 1

A mock object implements methods of the real object. It does not have fields of the real object (even if these fields are public).