How to mock static function inside Akka Actor scope?

Question

I have an actor which calls a static method from a Helper I'd like to mock:

public class ExampleActor extends AbstractActor {
    public Receive createReceive() {
        .match(CachedFile.class, cachedFile -> {
            UploadFileHelper.makeRequest(cachedFile.getContent());
            return true;
        });
    }
}

I've tried mocking it:

@RunWith(PowerMockRunner.class)
@PrepareForTest(UploadFileHelper.class)
public class ExampleActorTest {

    @Test
    public void testCreateFile() {
        new TestKit(system) {{
            PowerMockito.mockStatic(UploadFileHelper.class);
            PowerMockito.when(
                UploadFileHelper.makeRequest(any())
            ).thenReturn(true);

            exampleActor.tell(cachedFile, getRef());
        }}
    }
}

But for any reason the real method is being called instead of the mocked one.

Is there any change I should do in order to mock static methods inside the Akka Actor context?

Answer 1

When I use mockStatic, mockStatic in

"main"@1 in group "main": RUNNING 

is ok， but it can not work in

"AkkaTestKit-akka.actor.default-dispatcher-3"@2,614 in group "main": RUNNING

Just use CallingThreadDispatcher when you create your Props.

final Props props = Props.create(ExampleActor.class).withDispatcher(CallingThreadDispatcher.Id());

It works for me.