Error testing with Spring Cloud Stream Test - spring

Question

We are using spring-cloud-stream to manage messages between our applications.
We have custom bindings:
public interface InboundChannels {
String TASKS = "domainTasksInboundChannel";
String EVENTS = "eventsInboundChannel";
#Input(TASKS)
SubscribableChannel tasks();
#Input(EVENTS)
SubscribableChannel events();
}
public interface OutboundChannels {
String TASKS = "domainTasksOutboundChannel";
String EVENTS = "eventsOutboundChannel";
#Output(TASKS)
MessageChannel tasks();
#Output(EVENTS)
MessageChannel events();
}
There are processors that consumes tasks and generate events:
#EnableBinding({InboundChannels.class, OutboundChannels.class})
public class TasksProcessor {
public TasksProcessor(
UserService userService,
#Qualifier(OutboundChannels.EVENTS) MessageChannel eventsChannel
) {
this.userService = userService;
this.eventsChannel = eventsChannel;
}
#StreamListener(value = TASKS, condition = "headers['" + TYPE + "']=='" + CREATE_USER + "'")
public void createUser(Message<User> message) {
final User user = message.getPayload();
userService.save(user)
.subscribe(created -> {
Message<User> successMessage = fromMessage(message, Events.USER_CREATED, created).build();
eventsChannel.send(successMessage);
});
}
}
Now we wanted to test it using spring-cloud-stream-test-support and its amazing features:
#DirtiesContext
#SpringBootTest
#RunWith(SpringRunner.class)
public class TasksProcessorTest {
private User user;
#Autowired
private InboundChannels inboundChannels;
#Autowired
private OutboundChannels outboundChannels;
#Autowired
private MessageCollector collector;
#Before
public void setup() {
user = new User(BigInteger.ONE, "test#teste.com");
}
#Test
public void createUserTest() {
final Message<User> msg = create(CREATE_USER, user).build();
outboundChannels.tasks().send(msg);
final Message<?> incomingEvent = collector.forChannel(inboundChannels.events()).poll();
final String type = (String) incomingEvent.getHeaders().get(TYPE);
assertThat(type).isEqualToIgnoringCase(USER_CREATED);
}
}
application.properties
##
# Spring AMQP configuration
##
spring.rabbitmq.host=rabbitmq
spring.rabbitmq.username=admin
spring.rabbitmq.password=admin
# Events channels
spring.cloud.stream.bindings.eventsOutboundChannel.destination=events
spring.cloud.stream.bindings.eventsInboundChannel.destination=events
spring.cloud.stream.bindings.domainTasksOutboundChannel.destination=domainTasks
spring.cloud.stream.bindings.domainTasksInboundChannel.destination=domainTasks
spring.cloud.stream.bindings.userTasksInboundChannel.group=domainServiceInstances
spring.cloud.stream.bindings.eventsInboundChannel.group=domainServiceInstances
But then we get this error:
java.lang.IllegalArgumentException: Channel [eventsInboundChannel] was not bound by class org.springframework.cloud.stream.test.binder.TestSupportBinder
What are we doing wrong?

Answer 1

In the .subscribe() you do eventsChannel.send(successMessage);, where that eventsChannel is from the OutboundChannels.EVENTS, but what you try to do in the test-case is like inboundChannels.events(). And it doesn't look like you really bind this channel anywhere.
I'm sure if you would use outboundChannels.events() instead, that would work for you.