How to check if-statement in method using Mockito and JUnit?

Question

I have method that I should test. Code (of course some parts were cut):

public class FilterDataController {

    public static final String DATE_FORMAT = \"y         


        

Answer 1

You will have to mock FilterDataProvider and then inject this into your test class using InjectMocks.

getPossibleFilterData will be the method under test, so choose any specific date (use Calendar.set(...), then Calendar.getTime()) and send this same date as both the startDate and endDate.

Now after getPossibleFilterData is completed, you can verify whether filterDataProvider.getPossibleCountries was called with a end Date that is one millisecond more than the start date. This can be done through Calendar.getTimeInMillis() inside the mocked class's method, or by verifying with Mockito with a Date that is one millisecond more than the date that was originally specified.

Edit: Code example provided:

public class FilterDataControllerTest {
    @Test
    public void testSameDate() {
        FilterDataProvider provider = Mockito.mock(FilterDataProvider.class);
        FilterDataController controller = new FilterDataController(provider);

        Date startDate = new GregorianCalendar(2016, Calendar.JANUARY, 11).getTime();
        Date endDate = new GregorianCalendar(2016, Calendar.JANUARY, 11).getTime();
        Date expectedEndDate = new Date(endDate.getTime() + TimeUnit.DAYS.toMillis(1) - 1);

        controller.getPossibleFilterData(startDate, endDate);

        Mockito.verify(provider).getPossibleCountries(Mockito.eq(startDate), Mockito.eq(expectedEndDate));
    }
}