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

If you really want a pure unit test not an integration test, you could rely on the annotation @Mock to mock your service FilterDataProvider and @InjectMocks to inject your mock into your instance of FilterDataController.

Then you could propose 3 tests:

1. One test where the dates are corrects but different,
2. Another one where the dates are corrects but equal
3. And the last one where the dates are incorrect which will thrown a ValueNotAllowedException that could be tested out of the box using @Test(expected = ValueNotAllowedException.class).

If you need to make sure that filterDataProvider.getPossibleCountries(startDate, newEndDate) has been called with the expected arguments you need to use verify.

The code would then be something like that:

@RunWith(MockitoJUnitRunner.class)
public class FilterDataControllerTest {
    @Mock
    FilterDataProvider filterDataProvider;
    @InjectMocks
    FilterDataController controller;

    @Test(expected = ValueNotAllowedException.class)
    public void testGetPossibleFilterDataIncorrectDates() {
        controller.getPossibleFilterData(new Date(1L), new Date(0L));
    }

    @Test
    public void testGetPossibleFilterDataCorrectDates() {
        // Make the mock returns a list of fake possibilities
        Mockito.when(
            filterDataProvider.getPossibleCountries(
                Mockito.anyObject(), Mockito.anyObject()
            )
        ).thenReturn(Arrays.asList("foo", "bar"));
        ResponseEntity