How to test Spring @EventListener method?

First, As you’re using Spring Boot, the testing of these becomes pretty straightforward. This test will spin up the boot context and inject a real instance of ApplicationEventPublisher, but create a mocked instance of SomeDependency. The test publishes the desired event, and verifies that your mock was invoked as you expected.

@RunWith(SpringRunner.class)
@SpringBootTest
public class EventPublisherTest {

   @Autowired 
   private final ApplicationEventPublisher publisher;

   @MockBean
   private SomeDependency someDependency;

   @Test
   public void test() {
      publisher.publishEvent(new MyApplicationEvent(createMySource()));

      // verify that your method in you 
      verify(someDependency, times(1)).someMethod();
   }
}