BusinessService.java

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

	private SomeService someService;
	private AnotherService anotherService;
	
	public void executeSomeLogic(String input) {
	
		Something thing = anotherService.makeSomething(input);
		thing.setSomeField(anotherService.makeSomeField(input));
		someService.doSomething(thing);
	
	}
	
	public void executeSomeMoreLogic(String input) {
	
		Something thing = anotherService.makeSomething(input);
		someService.doSomethingElse(thing);
		
	}
	
}

/*
* Business Logic Test
*/
@RunWith(MockitoJUnitRunner.class)
public class MyBusinessServiceTest {

	@Mock
	private AnotherService anotherService;
	
	@Mock
	private SomeService someService;
	
	@InjectMocks
	private MyBusinessService myBusinessService;
	
	@Captor
	private ArgumentCaptor<Something> somethingCaptor;
	
	@Before
	public void init() {
		when(anotherService.makeSomething("A")).thenReturn(new Something());
		when(anotherService.makeSomething("B")).thenReturn(new Something());
		when(anotherService.makeSomething("C")).thenReturn(new Something());
		when(anotherService.makeSomething("D")).thenReturn(new Something());
		
		when(anotherService.makeSomeField(any(Something.class)).thenReturn("something");
	}
	
	@Test
	public void testExecuteSomeLogic_SCenario1() {
		
		String input = "A";
		myBusinessService.executeSomeLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
	@Test
	public void testExecuteSomeLogic_SCenario2() {
		
		String input = "B";
		myBusinessService.executeSomeLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
	/*
	* This test doesn't use the anotherService.makeSomeField so it clutters up our init
	*/ 
	@Test
	public void testExecuteSomeMoreLogic() {
		
		String input = "A";
		myBusinessService.executeSomeMoreLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
}