How to test bindings with useNativeEncoding=true in Spring Cloud Stream - spring-kafka

Question

I'm trying to test an application with the following binding configured:
spring:
cloud:
stream:
bindings:
accountSource:
destination: account
producer:
useNativeEncoding: true
kafka:
binder:
brokers: ${KAFKA_BOOTSTRAP_ADDRESSES}
producer-properties:
schema.registry.url: ${KAFKA_SCHEMA_REGISTRY_URL}
value.subject.name.strategy: io.confluent.kafka.serializers.subject.RecordNameStrategy
bindings:
accountSource:
producer:
configuration:
key:
serializer: org.apache.kafka.common.serialization.StringSerializer
value:
serializer: io.confluent.kafka.streams.serdes.avro.SpecificAvroSerializer
When running the application normally, AbstractMessageChannel.interceptorList is empty and sending message to broker works fine.
When running the test (with spring-cloud-stream-test-support binder), AbstractMessageChannel.interceptorList gets populated with MessageConverterConfigurer and message is being converted using content-type serialization mechanisms (Avro object is converted to JSON). This is the test code:
#RunWith(SpringRunner.class)
public class AccountServiceImplTest {
#Autowired
private AccountService accountService;
#Autowired
private MessageCollector messageCollector;
#Autowired
private MessageChannel accountSource;
#Test
public void create() {
// Simplified code
AccountCreationRequest accountCreationRequest = AccountCreationRequest.builder().company(company).subscription(subscription).user(user).build();
accountCreationRequest = accountService.create(accountCreationRequest);
Message<?> message = messageCollector.forChannel(accountSource).poll();
// execute asserts on message
}
#TestConfiguration
#ComponentScan(basePackageClasses = TestSupportBinderAutoConfiguration.class)
static protected class AccountServiceImplTestConfiguration {
#EnableBinding({KafkaConfig.AccountBinding.class})
public interface AccountBinding {
#Output("accountSource")
MessageChannel accountSource();
}
}
Am I missing something to disable spring-cloud-stream serialization mechanisms?

Answer 1

Don't use the test binder; use the Kafka binder with an embedded kafka broker instead.