Apache Camel Beans Unit Testing - unit-testing

Question

I am using Apache Camel with Spring boot in my application. Currently I am working on a Unit test.
Java Code
DataRoute class
from("direct:getData")
.routeId("getData")
.bean(DataService.class, "processData")
.marshal().json(JsonLibrary.Jackson)
.end();
DataService class
public Data processData() {
return new Data("Hello World");
}
Data Class with getters, setters and Jackson toString method
private String value;
Unit test
BaseCamelContextUnitText
public abstract class BaseCamelContextUnitTest extends CamelTestSupport
{
#Autowired
private DataService dataService;
#Produce
private ProducerTemplate producerTemplate;
public CamelContext getCamelContext() {
return camelContext;
}
#Override
protected Context createJndiContext() throws Exception {
JndiContext context = new JndiContext();
context.bind("dataService", dataService);
return context;
}
#Test
public void shouldProcessData() throws Exception {
RouteDefinition routeDef = getCamelContext().getRouteDefinition("getData");
routeDef.adviceWith((ModelCamelContext) getCamelContext(), new RouteBuilder() {
#Override
public void configure() throws Exception {
from("direct:getData")
.pipeline("bean:dataService?method=processData");
}
});
getCamelContext().start();
String responseData = "{"
+ "\"value\":\"Unit test success\""
+ "}";
Object response = producerTemplate.sendBody("direct:getData", ExchangePattern.InOut, null);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
((InputStreamCache) response).writeTo(byteArrayOutputStream);
assertThat(new String(byteArrayOutputStream.toByteArray()), is(responseData));
}
}
How do I mock
.bean(DataService.class, "processData")
in the unit test to return a mock Data Object with its default String variable as say "Unit test success" and then test to see if the route would give back the mocked Object instead of the Object with "Hello World" String variable?

Answer 1

This may seem's a late response, but I faced the same thing as described in your case, and I come across a simple way to "mock" the bean step, by using the DefaultRegistry to register the mocked bean into Camel registry, for example :
#Test
public void shouldProcessData() throws Exception {
...
...
DataService dataService = new DataService(...);
stubBean("dataService", dataService); // put this before calling context.start();
context.start();
...
...
}
/**
* This method inject a stub bean into the registry
* #param beanName the name of the bean being injected
* #param instance the stub instance
*/
void stubBean(String beanName, Object instance) {
DefaultRegistry registry = context.getRegistry(DefaultRegistry.class);
registry.bind(beanName, instance);
}

Answer 2

You can autowired the DataService in your DataRoute like
#Component
public class DataRoute extends RouteBuilder {
#Autowired
private DataService dataService;
#Override
public void configure() throws Exception {
from("direct:getData")
.routeId("getData")
.bean(dataService, "processData")
.marshal().json(JsonLibrary.Jackson)
.end();
}
}
So you can mock the DataService as usual.
An alternative is using beanRef("beanName", "methodName") in the Route.