How to invoke @BeforeMethod block before @PostConstruct

Question

I am writing below Spring Unit test code. Unit test @Before method is not getting executed. Since it is directly running @PostConstruct i am getting erorrs Caused by: java.lang.IllegalArgumentException: rate must be positive because the default value is 0.00. I want to set some value to request max limit so that postcontstruct block will go through smoothly. what is wrong in my code? Please help.

@Component
public class SurveyPublisher  {

    @Autowired
    private SurveyProperties surveyProperties;

    @PostConstruct
        public void init() {
            rateLimiter = RateLimiter.create(psurveyProperties.getRequestMaxLimit());
        }

    }

    public void publish() {
        rateLimiter.acquire();
        // do something
    }

}

//Unit test class

public class SurveyPublisherTest  extends AbstractTestNGSpringContextTests {

    @Mock
    SurveyProperties surveyProperties;

    @BeforeMethod   
    public void init() {
        Mockito.when(surveyProperties.getRequestMaxLimit()).thenReturn(40.00);
    }

    @Test
    public void testPublish_noResponse() {
        //do some test
    }

}

Answer 1

Just realized it will always run postConstruct method before Junit callback methods cause spring takes the precedence. As explained in the documentation -

if a method within a test class is annotated with @PostConstruct, that method runs before any before methods of the underlying test framework (for example, methods annotated with JUnit Jupiter’s @BeforeEach), and that applies for every test method in the test class.

Solution to you issue -

1. As @chrylis commented above refactor your SurveyPublisher to use constructor injection to inject the rate limiter. So you can then easily test.
2. Inject Mock/Spy bean which is causing the problem

3. Create test config to give you the instance of the class to use as @ContextConfiguration

   @Configuration
   public class YourTestConfig {
   
       @Bean
       FactoryBean getSurveyPublisher() {
           return new AbstractFactoryBean() {
               @Override
               public Class getObjectType() {
                   return SurveyPublisher.class;
               }
   
               @Override
               protected SurveyPublisher createInstance() {
                   return mock(SurveyPublisher.class);
               }
           };
       }
   }