Unit testing Camel Blueprint routes

Last week, while in Vegas, I discussed with my colleague Scott Cranton and he told me that something that was really making our users tend to stick with Spring-DM when using Camel Blueprint routes was that unit testing those routes was not possible.

So I hacked a small support library for Camel, leveraging PojoSR which provides a service registry without using a fully compliant OSGi container. This allows defining real unit tests (as opposed to integration tests using Pax Exam.

See the below example.

public class DebugBlueprintTest extends CamelBlueprintTestSupport {

    @Override
    protected Collection<URL> getBlueprintDescriptors() {
        return Collections.singleton(getClass().getResource("camelContext.xml"));
    }

    @Test
    public void testRoute() throws Exception {
        // set mock expectations
        getMockEndpoint("mock:a").expectedMessageCount(1);

        // send a message
        template.sendBody("direct:start", "World");

        // assert mocks
        assertMockEndpointsSatisfied();
    }

}

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">

 <camelcontext autostartup="true" id="camelContext" trace="true" xmlns="http://camel.apache.org/schema/blueprint">

  <route>
   <from uri="direct:start"/>
   <transform>
    <simple>Hello ${body}</simple>
   </transform>
   <to uri="mock:a"/>
  </route>
 </camelcontext>

</blueprint>