Testing abstract class with Mockito. How?

Question

I have the following class:

abstract class Foo {
        abstract List<String> getItems();
        public void process() {
            getItems()
                    .stream()
                    .forEach(System.out::println);
        }
    }

What I'd like to test is the process() method, but it is dependent on the abstract getItems(). One solution can be to just create an ad-hoc mocked class that extends Foo and implements this getItems().

What's the Mockito way to do that?

I would not *mock* `Foo` but create an inner class `FooTestImpl` in your `FooTest` class and use an instance of that for your test. You should of course not override any methods already implemented in the parent class. — luk2302, Oct 07 '20 at 11:53
Does this answer your question? [Using Mockito to test abstract classes](https://stackoverflow.com/questions/1087339/using-mockito-to-test-abstract-classes) — Ivar, Oct 07 '20 at 11:57

Rob Audenaerde · Accepted Answer · 2020-10-07T11:55:48.337

2

Why not just:

    List<String> cutsomList = ....
    Foo mock = Mockito.mock(Foo.class);
    Mockito.when(mock.getItems()).thenReturn(customList);
    Mockito.when(mock.process()).thenCallRealMethod();

Or (for void)

    doCallRealMethod().when(mock.process()).voidFunction();

edited Oct 07 '20 at 11:55

answered Oct 07 '20 at 11:54

Rob Audenaerde

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Since I need to check the original method `process()` – IsaacLevon Oct 07 '20 at 11:54
@yaseco then just call the real method? – Rob Audenaerde Oct 07 '20 at 11:57
Oh I see what you did with `thenCallRealMethod()` thanks! – IsaacLevon Oct 07 '20 at 14:35

Testing abstract class with Mockito. How?

1 Answers1