How to write spring boot unit test for a method which calls another @Async method inside it?

I need to write integration test for "processEvent" method which calls a @Async method inside it. I tried writing a test for this method, but the issue was it did not save the Student object to the DB. However removing @Async annotation allows me to save the object. I want to know how should I write Test cases for this method, eliminating the @Async issue. I want to save the student object while testing. I have attached my code and below.

Here is the ClassA and it has the method I want to test.

@Service
public class ClassA {

private final ConfigurationProcessor<Student> configurationProcessor;

	@Autowired
    public ClassA(ConfigurationProcessor<Student> configurationProcessor) {
        this.configurationProcessor = configurationProcessor;
	}

    public void processEvent(Configuration configuration) {
		configurationProcessor.process(configuration);
	}
} 

This is the interface ConfigurationProcessor class

public interface ConfigurationProcessor<T> {
    void process(Configuration configuration);
}

And this is its Impl class

@Service
public class ConfigurationProcessoeStudents10Impl implements ConfigurationProcessor<Student> {
    private final StudentRepository studentRepository;

    @Autowired
    public ConfigurationProcessoeStudents10Impl(StudentRepository studentRepository) {
        this.studentRepository = studentRepository;
		}
	
	@Override
    @Async
    public void process(Configuration configuration) {
		studentRepository.save(Student.builder().Name(configuration.name).Age(configuration.age));
	}
} 

This is the Test I have written so far.

@EnableAutoConfiguration
@SpringBootTest
public class AudienceC10IT {

  @Autowired
  ClassA classA;
  
  @Test
  @Tag("VerifyProcess")
  @DisplayName("Verify kafka event consumer from configuration manager")
  void verifyProcess(){
	Configuration configuration = new Configuration("lal",12);
	classA.processEvent(configuration);
  }
}

If you have have set up a ThreadPoolTaskExecutor bean you can Autowire it in your test.
Then, after you call your async method, you can await the termination.
Then you can check for the expected behaviour / result.

Something like this:

@Autowired
private ThreadPoolTaskExecutor asyncTaskExecutor;

@Test
void test() {
    callAsyncMethod();

    boolean terminated = asyncTaskExecutor.getThreadPoolExecutor().awaitTermination(1, TimeUnit.SECONDS);

    assertAsyncBehaviour();


}