====== Tests unitarios y de integración ======

<figure>
{{ testing.png }}
<caption>Testing (Fuente: https://katalon.com/resources-center/blog/unit-testing)</caption>
</figure>

----

===== Tests unitarios =====

==== Utils ====

Además de las capas ''Service'' y ''Controller'', vamos a suponer también que tenemos algunos métodos de utilidad, por ejemplo para trabajar con fechas. Asi también veremos cómo preparar los test unitarios para esta parte del código.

<code java>
public class DateUtil {

    public static final String DATE_PATTERN = "dd/MM/yyyy";

    public static LocalDate format(String date) {
        return LocalDate.parse(date, DateTimeFormatter.ofPattern(DATE_PATTERN));
    }

    public static long getDaysBetweenDates(LocalDate startDate, LocalDate endDate) {
        return Math.abs(startDate.until(endDate, ChronoUnit.DAYS));
    }
}
</code>

Asi, para las dos funciones anteriores, podríamos preparar algunos casos que nos permitieran comprobar cómo funciona para diferentes entradas.

<code java>
public class DateUtilTests {

    @Test
    public void testFormat() {
        String dateString = "12/04/2025";

        LocalDate actualLocalDate = DateUtil.format(dateString);
        assertEquals(2025, actualLocalDate.getYear());
        assertEquals(4, actualLocalDate.getMonthValue());
        assertEquals(12, actualLocalDate.getDayOfMonth());
    }

    @Test
    public void testGetDaysBetweenDates() {
        LocalDate startDate = LocalDate.of(2025, 1, 1);
        LocalDate endDate = LocalDate.of(2025, 3, 1);

        long actualDays = DateUtil.getDaysBetweenDates(startDate, endDate);
        assertEquals(59, actualDays);

        actualDays = DateUtil.getDaysBetweenDates(endDate, startDate);
        assertEquals(59, actualDays);

        actualDays = DateUtil.getDaysBetweenDates(startDate, startDate);
        assertEquals(0, actualDays);
    }
}
</code>

==== Capa Service ====

<code java>
@Service
public class CarService {
. . .
    public List<CarOutDto> getAll(String brand, String model) {
        List<Car> carList;

        if (brand.isEmpty() && model.isEmpty()) {
            carList = carRepository.findAll();
        } else if (brand.isEmpty()) {
            carList = carRepository.findByModel(model);
        } else if (model.isEmpty()) {
            carList = carRepository.findByBrand(brand);
        } else {
            carList = carRepository.findByBrandAndModel(brand, model);
        }

        return modelMapper.map(carList, new TypeToken<List<CarOutDto>>() {}.getType());
    }
. . .
}
</code>

En este caso tenemos el método ''getAll'' que toma 2 parámetros para filtrar el listado de vehículos por ''brand'' y/o ''model'', por lo que deberíamos preparar varios casos, uno por cada posibilidad. Sería algo como lo siguiente:

  * ''getAll("", "")''
  * ''getAll(brand, "")''
  * ''getAll("", model)''
  * ''getAll(brand, model)''

Para lo que necesitemos de la capa Repository, usaremos un objeto ''Mock'' para el que prepararemos nosotros mismos las respuestas según el caso. Algo parecido haremos también para el Bean de ''ModelMapper''

<code java>
@ExtendWith(MockitoExtension.class)
public class CarServiceTests {

    @InjectMocks
    private CarService carService;

    @Mock
    private CarRepository carRepository;

    @Mock
    private ModelMapper modelMapper;

    @Mock
    private UserRepository userRepository;

    @Test
    public void testGetAll() {
        List<Car> mockCarList = List.of(
                new Car(1, "Opel", "Corsa", LocalDate.now(), LocalDate.now(), 200, 0.5, 0.34, null),
                new Car(2, "Ford", "Fiesta", LocalDate.now(), LocalDate.now(), 120, 0.5, 0.34, null),
                new Car(3, "Ford", "Ka", LocalDate.now(), LocalDate.now(), 100 , 0.2, 0.56, null)
        );
        List<CarOutDto> mockCarOutDtoList = List.of(
                new CarOutDto(1, "Opel", "Corsa", 1, 0.5, 0.34),
                new CarOutDto(2, "Ford", "Fiesta", 1, 0.5, 0.34),
                new CarOutDto(3, "Ford", "Ka", 2, 0.2, 0.56)
        );

        // Mocks
        when(carRepository.findAll()).thenReturn(mockCarList);
        when(modelMapper.map(mockCarList, new TypeToken<List<CarOutDto>>() {}.getType())).thenReturn(mockCarOutDtoList);

        // Listado de coches sin aplicar ningún filtro
        List<CarOutDto> carList = carService.getAll("", "");
        assertEquals(3, carList.size());
        assertEquals("Opel", carList.get(0).getBrand());
        assertEquals("Corsa", carList.get(0).getModel());
        assertEquals("Ford", carList.get(carList.size() - 1).getBrand());
        assertEquals("Ka", carList.get(carList.size() - 1).getModel());

        verify(carRepository, times(1)).findAll();
        verify(carRepository, times(0)).findByBrand("");
        verify(carRepository, times(0)).findByModel("");
        verify(carRepository, times(0)).findByBrandAndModel("", "");
    }

    @Test
    public void testGetAllByBrand() {
        List<Car> mockCarList = List.of(
                new Car(1, "Opel", "Corsa", LocalDate.now(), LocalDate.now(), 200, 0.5, 0.34, null)
        );
        List<CarOutDto> mockCarOutDtoList = List.of(
                new CarOutDto(1, "Opel", "Corsa", 1, 0.5, 0.34)
        );

        // Mocks
        when(carRepository.findByBrand("Opel")).thenReturn(mockCarList);
        when(modelMapper.map(mockCarList, new TypeToken<List<CarOutDto>>() {}.getType())).thenReturn(mockCarOutDtoList);

        // Listado de coches aplicando el filtro por brand
        List<CarOutDto> carList = carService.getAll("Opel", "");
        assertEquals(1, carList.size());
        assertEquals("Opel", carList.get(0).getBrand());
        assertEquals("Corsa", carList.get(0).getModel());

        verify(carRepository, times(0)).findAll();
        verify(carRepository, times(0)).findByModel("Opel");
        verify(carRepository, times(0)).findByBrandAndModel("Opel", "");
        verify(carRepository, times(1)).findByBrand("Opel");
    }

    // TODO testGetAllByModel
    // TODO testGetAllByBrandAndModel>
. . . 
</code>
==== Capa Controller ====

<code java>
 @GetMapping("/cars")
    public ResponseEntity<List<CarOutDto>> getAll(@RequestParam(value = "brand", defaultValue = "") String brand,
                                                  @RequestParam(value = "model", defaultValue = "") String model) {
        logger.info("BEGIN getAll");
        List<CarOutDto> cars = carService.getAll(brand, model);
        logger.info("END getAll");
        return new ResponseEntity<>(cars, HttpStatus.OK);
    }
</code>

<code java>
@WebMvcTest(CarController.class)
public class CarControllerTests {

    @Autowired
    private MockMvc mockMvc;

    @Autowired
    private ObjectMapper objectMapper;

    @MockBean
    private CarService carService;

    @MockBean
    private UserRepository userRepository;

    @Test
    public void testGetAllWithoutParametersReturnOk() throws Exception {
        List<CarOutDto> mockCarOutDtoList = List.of(
                new CarOutDto(1, "Opel", "Corsa", 1, 0.5, 0.34),
                new CarOutDto(2, "Ford", "Fiesta", 1, 0.5, 0.34),
                new CarOutDto(3, "Ford", "Ka", 2, 0.2, 0.56)
        );

        when(carService.getAll("", "")).thenReturn(mockCarOutDtoList);

        MvcResult response = mockMvc.perform(MockMvcRequestBuilders.get("/cars")
                        .accept(MediaType.APPLICATION_JSON_VALUE))
                .andExpect(status().isOk())
                .andReturn();

        String jsonResponse = response.getResponse().getContentAsString();
        List<CarOutDto> carListResponse = objectMapper.readValue(jsonResponse, new TypeReference<>(){});

        assertNotNull(carListResponse);
        assertEquals(3, carListResponse.size());
        assertEquals("Opel", carListResponse.get(0).getBrand());
        assertEquals("Corsa", carListResponse.get(0).getModel());
    }

    @Test
    public void testGetAllByBrandReturnOk() throws Exception {
        List<CarOutDto> mockCarOutDtoList = List.of(
                new CarOutDto(1, "Opel", "Corsa", 1, 0.5, 0.34),
                new CarOutDto(2, "Opel", "Astra", 1, 0.5, 0.34)
        );

        when(carService.getAll("Opel", "")).thenReturn(mockCarOutDtoList);

        MvcResult response = mockMvc.perform(MockMvcRequestBuilders.get("/cars")
                        .queryParam("brand", "Opel")
                        .accept(MediaType.APPLICATION_JSON_VALUE))
                .andExpect(status().isOk())
                .andReturn();

        String jsonResponse = response.getResponse().getContentAsString();
        List<CarOutDto> carListResponse = objectMapper.readValue(jsonResponse, new TypeReference<>(){});

        assertNotNull(carListResponse);
        assertEquals(2, carListResponse.size());
        assertEquals("Opel", carListResponse.get(0).getBrand());
        assertEquals("Corsa", carListResponse.get(0).getModel());
    }

    // TODO testGetAllByModelReturnOk
    // TODO testGetAllByBrandAndModelReturnOk
. . .
</code>
===== Tests de integración =====



(c) 2025 Santiago Faci