BusinessService-refactored.java

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

	private DateService dateService;
	private SomeService someService;
	
	public void executeSomeLogic(String dateString) {
	
		Something thing = new Something();
		thing.setSomeField(dateService.parseDate(dateString));
		
		if(dateService.isToday(thing.getSomeField)) {
			// ... logic no longer dependant on DateUtils.parseDate && isToday
		}
		//... some other logic here
		
		someService.doSomething(thing);
	
	}
	
}

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

	@Mock
	private DateService dateService;
	
	@Mock
	private SomeService someService;
	
	@InjectMocks
	private MyBusinessService myBusinessService;
	
	@Captor
	private ArgumentCaptor<Something> somethingCaptor;
	
	@Test
	public void testExecuteSomeLogic_Scenario1() {
		// ...setup logic to test executeSomeLogic method logic and to make sure our static utility methods return an expected value
		when(dateService.parseDate(anyString()).thenReturn(new Date());
		when(dateService.isToday(any(Date.class)).thenReturn(true);
		
		String input = "anyString";
		myBusinessService.executeSomeLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
	@Test
	public void testExecuteSomeLogic_Scenario2() {
		// ...setup logic to test executeSomeLogic method logic and to make sure our static utility methods return an expected value
		when(dateService.parseDate(anyString()).thenReturn(new Date());
		when(dateService.isToday(any(Date.class)).thenReturn(false);
		
		String input = "anyString";
		myBusinessService.executeSomeLogic(input);
		
		verify(someService).doSomething(somethingCaptor.capture()); 
		// ...assert captured values here
	}
	
}

/*
* Date service
*/
public class DateService {
	
	public Date parseDate(String dateString) {
		return DateUtils.parseDate(dateString);
	}
	
	public Boolean isToday(Date date) {
		return DateUtils.parseDate(date);
	}
	
}