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Question

I am seeing a weird issue with my method returning an empty Optional in spite of mocking with mockito . What could be going wrong?

My test:

@RunWith(SpringRunner.class)
@WebMvcTest(InfoController.class)
@ActiveProfiles("test")
public class InfoControllerTest 
{
    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private Service service;

    @Autowired
    private ObjectMapper objectMapper;

 @Test
 public void testDeleteValueSet() throws JsonProcessingException, Exception
 {
     DeleteValueSetContainer c1 = new DeleteValueSetContainer();
     c1.setValueSetIds(Collections.singletonList(1L));
    
     Mockito.when(service.deleteValueSet(Mockito.anyList(), 
              Mockito.anyBoolean(), Mockito.anyBoolean())).thenReturn(Optional.of(new Info()));
     mockMvc.perform(delete("/deleteValueSet").
             accept(MediaType.APPLICATION_JSON)
             .content(objectMapper.writeValueAsString(c1))
           .contentType(MediaType.APPLICATION_JSON)).andExpect(status().isNoContent());
 }
}

Method under test:

@DeleteMapping("/deleteValueSet")
public ResponseEntity<Long> deleteValueSet(@RequestBody(required=true) DeleteValueSetContainer 
        deleteValueSetContainer)
{
    Optional<Info> optional = service.deleteValueSet(valueSetIds, 
            null, null);
    if(optional.isPresent())
    {
        Info valueInformation = optional.get();
        
        Long parentValueId = valueInformation.getParentValueId();
        if(parentValueId != null && parentValueId != 0L)
        {
            return ResponseEntity.created(ServletUriComponentsBuilder.
                    fromCurrentRequest().build().toUri())
                    .body((Long)valueInformation.getParentValueId());
        }
        return ResponseEntity.noContent().build();
    }
    
    return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
}

I end up getting 500 error instead of 200 because the mock doesn't work as expected.

Method being mocked:

public Optional<Info> deleteValueSet(List<Long> ids, Boolean char, 
        Boolean digit)
{ 
   // Logic to populate Info
   Info i = new Info();  
   return Optional.of(information);
}

Info is a public static inner class in the service.

public static class Info
{
    private Long parentValueId;
    private Long id;
    private Map<Long, Long> idInfos;
 }

Answer 1

Sorry guys, this was on me. The issue was that the code under test was passing null for the booleans (I had incorrectly shown valid values in the code above) and Mockito.anyBoolean() doesn't accept null . Modifying it to Mockito.anyNull() did the trick.

Answer 2

You should use anyLong() for the first parameter, not anyList().