Testing a custom protocol with Gatling 2.1.4 / No Gatling-core test-jar available in Maven central

Gatling (Open-Source)
1

Hello,

I am trying to write a custom protocol for Gatling and for integration testing purposes I inspired myself to the HttpIntegrationSpec in Gatling. It seems that such a spec uses io.gatling.core.test.ActorSupport , which access private [gatling] methods of the gatling Configuration:


def apply(f: TestKit with ImplicitSender => Any): Unit = synchronized {
  var oldGatlingConfiguration: GatlingConfiguration = null
  try {
    oldGatlingConfiguration = GatlingConfiguration.configuration
    GatlingConfiguration.set(GatlingConfiguration.setUpForTest())
    f(new TestKit(GatlingActorSystem.start()) with ImplicitSender)

  } finally {
    GatlingConfiguration.set(oldGatlingConfiguration)
    logger.info("Shutting down GatlingActorSystem")
    GatlingActorSystem.shutdown()
  }
}



Unfortunately the test-jar of gatling-core is not deployed on Maven central, what's the suggested approach to write integration specifications?



Regards



Edmondo
2

You won’t be able to write proper integration specs with Gatling 2.1.
You’d have to mutate the configuration singleton placeholder, which is of course not thread-safe.

That’s the reason why we got rid of our mutable singletons in 2.2.

3

Testing got a whole lot easier with Gatling 2.2, to the point the kind of workaround done in ActorSupport are longer needed :

AkkaSpec being the base class used for tests involving Akka Actors.

Since there was a lot of refactoring done in Gatling 2.2, which also impacts the customs protocols, I can only highly suggest that you use Gatling 2.2 snapshots instead of Gatling 2.1.

Cheers,

Pierre

4

Hello,

I have been trying to use AkkaSpec in a custom protocol test, but I’m not able to get AkkaSpec in any of the dependencies published on maven.

Since this Class is under src/test could you publish the test-jar for gatling-core?

We don’t seem to have one published at the moment under: https://repo1.maven.org/maven2/io/gatling/gatling-core/2.2.2/

Cheers,
Konstantinos

5

Contribs welcome

6

Hi Stephane,

I’m happy to help here, given that AkkaSpec also depends on BaseSpec that lives in gatling-commons, I would need to expose those project as well as test-jar.

Do you think we should rather move those classes under gatling-test-framework instead ?

Thanks,
Konstantinos

7

Actually, I’d rather keep those internal.
Moving them into deployed jars would send a message that they are public APIs (and you would use them this way), meaning that we can’t break them easily.
I think it’s best that you fork them. It’s not like they do much anyway.

8

No worries then, I will probably copy them over onto our custom protocol.

Cheers,
Konstantinos

9

Being curious. What’s your custom protocol about?

10

Hi Stephane,

The protocol is about Kafka integration, I know there is an older attempt already, but it is quite limited on what we are trying to achieve, e.g ideally we would want a request-reply paradigm similar to JMS protocol so that we can correlate throughput, response times, etc.

  • We need to use Kafka 0.10.x, whereas the old one is still on 0.8.x

Cheers,
K

11

Open source it. There might be other people who could be interested in helping.

12

Absolutely! Once we have something worth sharing I would definitely share with the community.

13

Great!