How to use WireMock to mock an upstream service with Protobuf (gRPC) response

Question

I am writing integration tests for my Java Service. We are thinking of using WireMock to mock upstream services. However, one of our upstream returns a Protobuf (grpc) response and I can't seem to understand how to mock a gRPC response using WireMock. I tried to convert the response to byteArray and use that ,however, wiremock fails to deserialize it to Protobuf Java Object.

We have a limitation that we can only use 1 mock server since all our upstream requests are forwarded via a servicemesh sidecar running on a fixed port.

Thanks!

Have you looked at the documentation for how to have test fakes for gRPC services? — Louis Wasserman, Sep 23 '21 at 20:10
FYI, Java gRPC has a `InProcessServerBuilder` useful for testing and mocks — Igor Artamonov, Mar 28 '23 at 23:49

score 3 · Answer 1 · answered Oct 14 '21 at 16:04

3

You could use Wiremock-gRPC or any of the other tools mentioned on the Wikipedia comparison site such as the commercial tool Traffic Parrot that supports gRPC or Camouflage.

answered Oct 14 '21 at 16:04

Wojtek

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How to use WireMock to mock an upstream service with Protobuf (gRPC) response

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