Mocking a concrete class in junit 3

Question

I have a class which has the following constructor:

class Foo {
    Foo (Bar bar) {
       ...
    }
}

I am attempting to write a unit test for this class and Mock out the dependency on Bar. However, I have to use JUnit 3 and Bar is a concrete type. Does anyone have any ideas? I cannot use EasyMock class-extension (requires JUnit 4) and haven't had success with Mockito. One (particularly ugly) solution I am considering is as follows:

interface IBarWrapper {
    void barMethod();
}

class BarWrapper implements IBarWrapper {
    void barMethod() {
        bar.barMethod();
    }
}

class Foo {
    Foo (IBarWrapper wrapper) {
        ...
    }
}

But I don't like the idea of changing my actual code to suit the tests.

Why didn't I think of that?! I guess because I don't have a ranking of 6655 :) . I think this is the best bet. Add this as an answer and I will mark it as correct. — bm1729, Nov 09 '12 at 15:02

score 1 · Answer 1 · answered Nov 09 '12 at 14:44

1

With EasyMock (v3.x) you are able to mock concrete class. See Readme

answered Nov 09 '12 at 14:44

willome

3,062
19
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This doesn't seem to work for me (NoClassDefFoundError org/objenesis/ObjenesisHelper). I think I will go for Garrett's suggestion. Thank you anyway. – bm1729 Nov 09 '12 at 15:01
Some dependencies are missing. see http://stackoverflow.com/questions/8258797/how-configure-easymock-class-extension-3-1 – willome Nov 09 '12 at 15:13

score 1 · Accepted Answer · answered Nov 09 '12 at 16:10

1

You can just subclass Bar. No need to over complicate things.

answered Nov 09 '12 at 16:10

Garrett Hall

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Mocking a concrete class in junit 3

2 Answers2