CODEWITHSUNDEEP
javaunit-testingtestngpowermockito
Deven Phillips
Deven Phillips

Reputation: 1139

Getting PowerMockito to mock a static method on an Interface?

I have a library I am trying to mock for testing... There is a Java 8 interface with a static method implementation like this:

public interface Router {
    public static Router router(Object param) {
        return new RouterImpl(param);
    }
}

And I am trying to mock that returned value:

PowerMockito.mockStatic(Router.class);
PowerMockito.doReturn(mockRouter).when(Router.router(any()));

But when I run the tests through a debugger, the mock instance is not returned.

I've tried a number of different permutations of the static mocking, but I cannot get the static method to return my mock value. Any thoughts?

Upvotes: 3

Views: 3227

Answers (2)

Ondrej Kvasnovsky
Ondrej Kvasnovsky

Reputation: 4643

You are doing it right, but we will have to wait when mocking static interface method is implemented/fixed in PowerMock. Watch this pull request: https://github.com/jayway/powermock/issues/510

Note: Good news is that issue in Javassist is already fixed:

https://github.com/jboss-javassist/javassist/pull/11

Upvotes: 4

Marcin Grzejszczak
Marcin Grzejszczak

Reputation: 11189

Why not wrap it in an abstraction that you can mock?

class RouterFactory {

    Router createRouter(Object param) {
        return Router.router(param);
    }
}

And use it in your class

class YourClass {
private final RouterFactory routerFactory;

YourClass(RouterFactory routerFactory) {
this.routerFactory = routerFactory;
}

void doSth() {
   // do sth    
}

}

Then you can mock the RouterFactory without any problems and you don't have to use Powermock.

Upvotes: 0

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