Calling callbacks with Mockito

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You want to set up an Answer object that does that. Have a look at the Mockito documentation, at
https://static.javadoc.io/org.mockito/mockito-core/2.8.47/org/mockito/Mockito.html#answer_stubs

You might write something like 

when(mockService.doAction(any(Request.class), any(Callback.class))).thenAnswer(
    new Answer<Object>() {
        Object answer(InvocationOnMock invocation) {
            ((Callback<Response>) invocation.getArguments()[1]).reply(x);
            return null;
        }
});

(replacing x with whatever it ought to be, of course)

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