Spring ServiceActivator not executed when defined inside my test - spring

Question

I have the following publishing class.
#Component
public class Publisher {
#Autowired
private MessageChannel publishingChannel;
#Override
public void publish(Event event) {
publishingChannel.send(event);
}
}
I have the following test class.
#RunWith(SpringRunner.class)
#SpringBootTest
public class PublisherTest {
private final List<Event> events = new ArrayList<>();
#Autowired
private Publisher publisher;
#Test
public void testPublish() {
Event testEvent = new Event("some_id_number");
publisher.publish(testEvent);
Awaitility.await()
.atMost(2, TimeUnit.SECONDS)
.until(() -> !this.events.isEmpty());
}
#ServiceActivator(inputChannel = "publishingChannel")
public void publishEventListener(Event event) {
this.events.add(event);
}
}
The message channel bean is instantiated elsewhere. The publisher runs as expected and an event is publishing to the channel, however the service activator is never invoked. What am I missing here?

Answer 1

Turns out you need to move the service activator to a separate test component class (#TestComponent prevents this from being injected outside the test context).
#TestComponent
public class TestListener {
public final List<Object> results = new ArrayList<>();
#ServiceActivator(inputChannel = "messageChannel")
public void listener(Event event) {
Object id = event.getHeaders().get("myId");
results.add(id);
}
}
Then you can bring this listener into your test. Make sure you use #Import to bring your service activator class into the test context.
#SpringBootTest
#Import(TestListener.class)
class PublisherTest {
#Autowired
private Publisher publisher;
#Autowired
private TestListener testListener;
#Test
void testPublish() {
this.publisher.publish(new Event().addHeader("myId", 1));
Awaitility.await()
.atMost(2, TimeUnit.SECONDS)
.until(() -> !this.testListeners.results.isEmpty());
}
}
The test passes after making these changes. Figured this out with a demo app and applied it to a production testing issue.