Object in bean constructor empty - spring-boot

Question

I have exception-messages written down in the application.yml. They are pure text, which is later reformatted using java.text.MessageFormat.
I have got the following custom RuntimeException my service throws when login failed:
#Component
public class AccountLoginFailedException extends RuntimeException {
#Autowired
public AccountLoginFailedException(#Value("#(${authservice.exception-messages.login-failed})") final String message, #Qualifier(value = "Credentials") final Credentials credentials) {
super(MessageFormat.format(message, credentials.getUsername()));
}
}
My test, which solely tests the AccountController and mocks away the service behind it:
#RunWith(SpringRunner.class)
#ContextConfiguration(classes = AuthServiceTestConfiguration.class)
#WebMvcTest(AccountController.class)
public class AccountControllerTest {
#Autowired
private BeanFactory beanFactory;
#Autowired
private ObjectMapper objectMapper;
#Autowired
private TestHelper helper;
#MockBean
private AccountService accountService;
#Autowired
private JwtService jwtService;
#Autowired
private MockMvc mvc;
#Test
public void test_LoginFailed_AccountDoesNotExist() throws Exception {
// Given
final Credentials credentials = helper.testCredentials();
final String credentialsJson = objectMapper.writeValueAsString(credentials);
final AccountLoginFailedException loginFailedException = beanFactory.getBean(AccountLoginFailedException.class, credentials);
// When
given(accountService.login(credentials)).willThrow(loginFailedException);
// Then
mvc
.perform(
post("/login")
.accept(MediaType.APPLICATION_JSON_UTF8_VALUE)
.contentType(MediaType.APPLICATION_JSON_UTF8_VALUE)
.content(credentialsJson))
.andExpect(status().isUnprocessableEntity())
.andExpect(jsonPath("$.data").value(equalTo(loginFailedException.getMessage())));
}
}
message contains the correct String. However: credentials contains just an empty object (not null) instead of the one created using helper.testCredentials().
Here is a slightly simplified TestHelper class I am using:
#TestComponent
public class TestHelper {
public static final String USERNAME = "SomeUsername";
public static final String PASSWORD = "SomePassword";
#Autowired
private BeanFactory beanFactory;
public Credentials testCredentials() {
final Credentials credentials = beanFactory.getBean(Credentials.class.getSimpleName(), Credentials.class);
credentials.setUsername(USERNAME);
credentials.setPassword(PASSWORD);
return credentials;
}
}
These custom exceptions are thrown by my application only and are always expected to contain the credentials (username) responsible for it. I also have a AccountExceptionsControllerAdvice-class, which just wraps these custom exceptions in a generic JSON response, exposing the error in a preferred manner.
How can I ensure that this particular instance of Credentials is inserted into the particular instance of AccountLoginFailedException? Or should I not be autowiring exceptions at all?

Answer 1

You could mock your Credentials component in your tests as follows:
#MockBean
private Credentials credentials;
#Before
public void before() {
when(credentials.getUsername()).thenReturn(USERNAME);
when(credentials.getPassword()).thenReturn(PASSWORD);
}