Unit Test: Cannot get value from Service in Java-CodePudding

I am trying to test the following method that gets data from Price service.

CountryServiceImpl:

public PriceDTO findBCountryUuid(UUID countryUuid) {
        
        // code omitted

    // !!! currency value is null
        Currency currency = currencyService.getCurrencyByCountry(countryUuid);
        
        return new PriceDTO(currency);
}

Here is the PriceService.

PriceServiceImpl:

@Override
public Currency getCurrencyByCountry(UUID countryUuid) {
        return countryRepository.findByUuid(countryUuid)
                        .orElseThrow(() -> new EntityNotFoundException("Country"))
                        .getCurrency();
}

I use the following approach to test:

@Mock
private CountryRepository countryRepository;

@Mock
private CurrencyServiceImpl currencyService;
        
@InjectMocks
private CountryServiceImpl priceService;


@Test
public void test_findBCountryUuid() {
        
        // code omitted 

        final Country country = new Country();
        country.setName("Country");
        country.setCurrency(currency);
        
        when(countryRepository.findByUuid(countryUuid))
            .thenReturn(Optional.of(country));

        PriceDTO result = priceService.findBCountryUuid(countryUuid);
        
        //... assertions        
}

The problem is that; In the findBCountryUuid method, the currency value is null, and for this reason I get null price value in the result parameter of my tets method. The problem is completely related to using wrong mocking or annotation related to the PriceService. I think I should mock the repo that PriceService uses instead of mocking PriceService. What is wrong with this implementation?

CodePudding user response：

You need to mock the behaviour for the method PriceServiceImpl.getCurrencyByCountry

PriceServiceImpl priceServiceMock = Mockito.mock(PriceServiceImpl.class);
Mockito.when(priceServiceMock.getCurrencyByCountry(any(UUID.class))).thenReturn(new Currency()); // Return either a newly instantiated object or a mockek one based on your need