Mock the body of an intermediate route executed in Camel Tests - apache-camel

Question

Available examples of the usage of the Camel Test component show how to test the expectations of a route:
However what I need to do is mock the body (manually setting it) of an intermediate route, e.g.:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
<bean id="exampleBean" class="xxx.ExampleBean"/>
<routeContext id="routesTest" xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="direct:route1" />
<to uri="direct:route2" />
<log message="${body}"/>
</route>
<route>
<from uri="direct:route2"/>
<to uri="bean:exampleBean"/>
<to uri="direct:route3" />
</route>
<route>
<from uri="direct:route3"/>
<log message="${body}"/>
</route>
</routeContext>
</beans>
In this scenario I want to completely avoid the actual execution of bean:exampleBean, mocking the result of its execution.
My test class:
public class MyTests extends CamelSpringTestSupport {
#Produce(uri = "direct:route1")
protected ProducerTemplate inputProducerTemplate;
#EndpointInject(uri = "mock:bean:exampleBean")
protected MockEndpoint mockBeanExampleBean;
#Test
public void testRoute() throws Exception {
CompletableFuture<Object> future = inputProducerTemplate.asyncSendBody("direct:route1", "Some message");
Object o = future.get();
}
#Override
public String isMockEndpoints() {
return "bean:exampleBean";
}
#Override
protected AbstractApplicationContext createApplicationContext() {
return new ClassPathXmlApplicationContext("spring/gesti-test-application-context.xml");
}
}
public class ExampleBean {
public String enhance(String message) {
System.out.println(message);
//Here I would call a REST API
return "MY API RESULT";
}
}
When using mockBeanExampleBean.whenAnyExchangeReceived(exchange -> exchange.getMessage().setBody("My message")); it allows to override the input to exampleBean, but doesn't avoid its execution.

Answer 1

In the context of your unit test, route2 might be a "mock" component instead. A clean way of achieving that is to declare the route(s) in the properties file. The legibility of the routes gets harder, though.
Then, you could:
#EndpointInject("mock://route2")
MockEndpoint mockSecondStep;
mockSecondStep.whenExchangeReceived(1, e -> {
List whatever = new ArrayList<>();
e.getMessage().setBody(whatever);
});

Answer 2

I solved it using an InterceptStrategy:
public class MyTests extends CamelSpringTestSupport {
#Test
public void testRoute() throws Exception {
CompletableFuture<Object> future = template.asyncSendBody("direct:route1", "Some message");
Object o = future.get();
assertEquals("INTERCEPTED!", o);
}
#Override
protected AbstractApplicationContext createApplicationContext() {
return new ClassPathXmlApplicationContext("spring/gesti-test-application-context.xml");
}
#Override
protected RouteBuilder createRouteBuilder() {
return new RouteBuilder() {
#Override
public void configure() {
context.getProcessorDefinition("bean:exampleBean").addInterceptStrategy(
(context, definition, target, nextTarget) -> exchange -> exchange.getOut().setBody("INTERCEPTED!"));
}
};
}
}
public class ExampleBean {
public String enhance(String message) {
System.out.println(message);
//Here I would call a REST API
return "MY API RESULT";
}
}