Mocking private classes

[Dusica Radojevic]

Hi,

I looked at documentation related to Mocking Private, but I didn't
find anything about mocking instatiation of private class inside
method. Can you refer to some example?

Thanks.
Dusica

[Johan Haleby]

Can you give us an example of what you're trying to mock?

/Johan

[Dusica Radojevic]

Actually, I kinda found a way to do it, using reflection. Problem that I had was how to set class type for mocking object(it is private class inside another class), so I get declared classes inside the parent class and comparing class names defined the one I needed.

Exactly, it was like this:

The class I tested extends one Spring's class. Concrete problem happened at point when I had to mock line from Spring's parent class super method, which was:

StringValueResolver valueResolver = new PlaceholderResolvingStringValueResolver(props);

inside method "processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props)" in class "PropertyPlaceholderConfigurer", where "PlaceholderResolvingStringValueResolver" is a private class inside "PropertyPlaceholderConfigurer", so I used next:

Class clazz = Class.forName("org.springframework.beans.factory.config.PropertyPlaceholderConfigurer");

Class privateClazz = null;

for (int i = 0; i < clazz.getDeclaredClasses().length; i++) {

if (clazz.getDeclaredClasses()[i].getName()

.equals("org.springframework.beans.factory.config.PropertyPlaceholderConfigurer$PlaceholderResolvingStringValueResolver")){

privateClazz = clazz.getDeclaredClasses()[i]; 

                        break;

}

}

And later I used "privateClazz" to define type in method createMock().

It works for me.

Maybe this is not elegant and the best way to do it, but I didn't find anything other useful.

I hope this helps in some way..

Dusica

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[Johan Haleby]

Hi,

I would strongly advice against mocking private inner classes since usually there are other more elegant ways of testing your problem and the test case can end up being very complex. Personally I would try to refactor the code if the test gets too complex or write an integration test instead of mocking at all.

PowerMock do include methods to find the type of private inner classes, including anonymous inner classes. It's undocumented though mainly because it should be used with extreme care. You can have a look at an example here.

Regards,
/Johan

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