Injecting one MockBean into another - spring

Question

I have a typical SpringApplication which I am trying to test via MockMvc. The application contains some database calls and some thridparty api calls, and I want to mock all of them, while testing end to end flow, except thirdparty
This is what I have created -
Controller class
public class PortfolioController {
private final PortfolioService portfolioService;
}
Service Class
public class PortfolioService {
private final PortfolioTransactionRepository portfolioTransactionRepository;
private final AlphavantageService alphavantageService;
}
AlphaVantageService
public class AlphavantageService {
private ApiConfig apiConfig;
private final RestTemplate restTemplate;
public Map<String, List<Candle>> getStockQuotes(List<String> symbols) {
return symbols.stream().collect(Collectors.toMap(symbol -> symbol, symbol -> getQuotes(symbol)));
}
}
Now comes the test -
#ExtendWith(SpringExtension.class)
#WebMvcTest(controllers = PortfolioController.class)
class PortfolioControllerTest {
private List<PortfolioTransaction> transactions;
#MockBean
private AlphavantageService alphavantageService;
#MockBean
private PortfolioService portfolioService;
#Autowired
private PortfolioController portfolioController;
#Autowired
private MockMvc mockMvc;
}
The problem is, when I try to execute any mvc call on server, AlphaVantageService is not injected inside PortfolioService, so till level1, I get the beans injected, but on further levels, I dont get the same.
Is it by design or I am missing something? How should we test such test-cases?

Answer 1

Actually After trying some options here and there, I found a solution.
Just like #MockBean, spring also have a notion called #SpyBean. That solved my problem. So now my test looks like below
#ExtendWith(SpringExtension.class)
#WebMvcTest(controllers = PortfolioController.class)
#MockBeans(value = {#MockBean(AlphavantageService.class),
#MockBean(PortfolioTransactionRepository.class)})
#SpyBeans(value = {#SpyBean(PortfolioService.class)})
class PortfolioControllerTest {
private List<PortfolioTransaction> transactions;
#Autowired
private AlphavantageService alphavantageService;
#Autowired
#SpyBean
private PortfolioService portfolioService;
#Autowired
private PortfolioController portfolioController;
#Autowired
private MockMvc mockMvc;
}
This works like a charm and I can use full fledged dependency Injection in the tests.