Unit testing log nodes in Apache camel routes - apache-camel

Question

Suppose I have the following camel route:
.from("direct:start")
.log("received ${body} message")
.to("mock:end");
How would you test that the message "received Camel rocks!" message is logged when you send a "Camel rocks!" message to the direct:start endpoint

Answer 1

I would read the written file. Or add a custom appender to the logging system and assert that it received the message.
Or check Camel's internal unit tests.
But what exactly are you trying to achieve?
You are supposed to test your application and not the frameworks you are using.

Answer 2

I would not test the actual logging part, but why not save the data you are interested in a property or header, and then in your unit test assert that the value of that property or header must be such and such?

Answer 3

Here is a way to test this which I admit is a bit too invasive. It would have been much easier if AdviceWithBuilder would have been added something like replaceWith(ProcessDefinition replacement).
Here is the working example:
package com.my.org.some.pkg;
import org.apache.camel.RoutesBuilder;
import org.apache.camel.builder.AdviceWithRouteBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.testng.CamelTestSupport;
import org.mockito.Mockito;
import org.slf4j.Logger;
import org.springframework.test.util.ReflectionTestUtils;
import org.testng.annotations.Test;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
public class CamelLoggingTest extends CamelTestSupport {
#Override
protected RoutesBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
#Override
public void configure() throws Exception {
from("direct:start").id("abc")
.log("received ${body} message")
.to("mock:stop");
}
};
}
#Test
public void shouldLogExpectedMessage() throws Exception {
Logger logger = Mockito.mock(Logger.class);
context.getRouteDefinition("abc").adviceWith(context, new AdviceWithRouteBuilder() {
#Override
public void configure() throws Exception {
ReflectionTestUtils.setField(context.getRouteDefinition("abc")
.getOutputs().get(0), "logger", logger);
}
});
when(logger.isInfoEnabled()).thenReturn(true);
sendBody("direct:start", "Camel rocks!");
verify(logger).info("received Camel rocks! message");
}
}