BusinessService-refactor.java

/*
* Business logic service
*/
public class MyBusinessService {

	private SomeService someService;
	
	public void executeSomeLogic(MyLogicOperator input) {
	
		Something thing = new Something();
		input.doLogic();
		someService.doSomething(thing);
	
	}

}

/*
* Business Logic Test
*/
@RunWith(MockitoJUnitRunner.class)
public class MyBusinessServiceTest {
	
	@Mock
	private SomeService someService;
	
	@InjectMocks
	private MyBusinessService myBusinessService;
	
	@Captor
	private ArgumentCaptor<Something> somethingCaptor;
	
	@Test
	public void testExecuteSomeLogic_Scenario1() {
			
		MyLogicOperator input = mock(MyLogicOperator.class);
		myBusinessService.executeSomeLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
}

/* Interface code omitted for brevity */

/*
* Concrete Impl of MyLogicOperator for A
*/
public class ALogicOperator implements MyLogicOperator {

	@Override
	public void doLogic() {
		// ...do some logic here
	}
}

/*
* ALogicOperator Test
*/
public class ALogicOperatorTest {

	@Test
	public void testdoLogic() {
		ALogicOperator operator = new ALogicOperator();
		operator.doLogic();
		// assert as needed
	}
}

/* other concrete impls omitted for brevity */