Hey. I'm trying to register an extension using junit 5. I'm using the

@RegisterExtension

annotation, and I know that my extension's

getName()

method is called, but the

transform

method is never actually called. I have tried using both a

ResponseTransformer

and a

ResponseDefinitionTransformer

, just in case there was a difference, and neither works. I'm using

stubFor()

to register the transformer for the stub. I know the stub matches the call, because I can make changes to the stub, and they show up in the test. I also tried using json stubs, with the same transformer name, and that also didn't work. I'm using WireMock 2.35 in a spring-boot 3 application. I followed this guide, but with the caveat that that guide uses interfaces that don't exist in my version of WireMock. Presumably because the guide is for a newer version of WireMock. I'm getting WireMock via

org.springframework.cloud:spring-cloud-contract-wiremock

, so I'm not really in a position to upgrade to 3.2.0. Any idea what I might be missing?

@RegisterExtension

is for JUnit extensions rather than WireMock's. You need to add your transformer via the

.extensio s(...)

method on the config object passed to WireMock at startup.

I see. Do you know if there are any spring-level hooks for that? I ask because we use an annotation to auto-configure wiremock, so we don't have access to that object directly

I think you can put an instance of

WireMockConfiguration

into the test context and add it to this, per this comment: https://github.com/spring-cloud/spring-cloud-contract/blob/main/spring-cloud-contr[…]ingframework/cloud/contract/wiremock/WireMockConfiguration.java

I tried providing a

WireMockConfiguration

as a bean, but I ran into issues that it didn't pick up whatever other spring magic the auto-configuration does. However, what did solve it was adding a

WireMockConfigurationCustomizer

bean:

I probably ought to refresh my understanding of it a bit, since it’s such a big portion of our users

Thanks for a great piece of software 😃

Thanks for the kind feedback!