RestClient Integration Test with MockRestServiceServer.bindTo fails about spring-boot

[bclozel]

I don't think this is a valid setup and I'm not sure this would even work with RestTemplate. The MockRestServiceServer bind operation modifies the builder to set up a client factory that dispatches request to the mockn but the CatFactService is injected with a separate builder: in Spring Boot, all RestClient.Builder instances are prototype scoped, meaning that each injection point gets its own new instance - mutating one doesn't affect the others.

I would suggest either writing a full integration test with @SpringBootTest and a mock server or testing your service independently (without calling the controller) and test the REST client.

[MV-GH]

This does work with RestTemplate see this branch for its equivalent with RestTemplate.

Neither of those options solve the problem that I need MockRestServiceServer because I need to mock a thirdparty API nested within my service. In the sample that is https://catfact.ninja

I have made SO post, since I can't find any documentation on MockRestServiceServer with RestClient
https://stackoverflow.com/questions/78203010/how-to-use-mockrestserviceserver-with-restclient-in-spring-boot