JUnit 5 test Mockito for RefreshToken

Question

Below is the code

@Service public class RefreshTokenServiceImpl implements RefreshTokenService {

@Autowired
private RefreshTokenRepository refreshTokenRepository;

@Override

public RefreshToken generateRefreshToken() {

RefreshTokenEntity tokenEntity = new RefreshTokenEntity();

tokenEntity.setToken(UUID.randomUUID().toString());

tokenEntity.setCreatedDate(Instant.now());


tokenEntity = refreshTokenRepository.save(tokenEntity);

return RefreshTokenBeanMapper.REFRESH_TOKEN_BEAN_MAPPER.refreshTokenEntityToModel(tokenEntity);
}

RefreshToken

public class RefreshToken {


private Long id;


private String token;

private Instant createdDate;
}

RefreshTokenBeanMapper

@Mapper

public interface RefreshTokenBeanMapper {

RefreshTokenBeanMapper REFRESH_TOKEN_BEAN_MAPPER = Mappers.getMapper(RefreshTokenBeanMapper.class);

RefreshToken refreshTokenEntityToModel(RefreshTokenEntity refreshTokenEntity);

}

Trying to write a suitable JUnit 5 Mockito test

Answer 1

As i understand, you need always generate the only one UUID and Date for yours token testing. For this, you can use experimental mockito-inline which contains functionality for static methods.

I guess you need something like this:

UUID testUUID = UUID.randomUUID();
Instant n = Instant.now();
    try {
      MockedStatic<UUID> uuid = Mockito.mockStatic(UUID.class)
      uuid.when(UUID::randomUUID).thenReturn(testUUID);
      MockedStatic<Instant> inst = Mockito.mockStatic(Instant.class)
      inst.when(Instant::now).thenReturn(n);
      ...
}
    ...

https://www.baeldung.com/mockito-mock-static-methods