I recently migrated my gRPC client to Stream approach, and the previous mocking implementation with Camouflage does not work anymore.
My client(Java):

  private final TestAdapterStub testAdapterStub;
  private CompletableFuture<GetTestResponse> responseFuture;


  public GetTestResponse getTest(String id) {
    GetTestRequest request = GetTestRequest.newBuilder()
        .setId(id)
        .build();

    responseFuture = new CompletableFuture<>();
    StreamObserver<GetTestResponse> responseObserver = getResponseObserver();
    var requestObserver = testAdapterStub.getTest(responseObserver);
    requestObserver.onNext(request);
    requestObserver.onCompleted();
    try {
      return responseFuture.join(); // here I am not getting response, failing by timeout
    } catch (CompletionException exception) {
      ...
    }
  }

  private StreamObserver<GetTestAdapter.GetTestResponse> getTestObserver() {
    return new StreamObserver<>() {
      @Override
      public void onNext(GetTestResponse getTestResponse) {
        responseFuture.complete(getTestResponse);
      }

      @Override
      public void onError(Throwable exception) {
        responseFuture.completeExceptionally(exception);
      }

      @Override
      public void onCompleted() {
      }
    };
  }
}

So, basically, instead of calling some other service, I want to mock the response using camouflage.
According to the documentation https://testinggospels.github.io/camouflage/mocking-gRPC/, I have created .proto file and .mock file under the correct directories, proto file was tested through the Postman and I am getting response from server and I know that directories are correct, because when I start camouflage container in Docker, I see in logs that those .mock file and .proto files are registered.

But no matter how I try to compose .mock file from the options in documentation, I am either getting error in camouflage logs that something is wrong with the file, or not getting any response and failing by timeout.

I tried:

1. Unary Or Client Side Streaming
   mock file:

{
  "testResponse": {
  }
}

Getting camouflage error: Cannot read properties of undefined (reading 'delay')
I have tried adding "delay": {{num_between lower=500 upper=600}} option to the file, but apparently it is not the problem, and I can’t determine what does this log mean.

2. Server Side Streaming
   mock file:

{
  "testResponse": {
  }
}
====
{
  "testResponse": {
  }
}

Getting camouflage error: Unexpected non-whitespace character after JSON at position 28. In this case, despite what documentation says, camouflage does not see ‘====’ symbols as a separator.

3. Bidi Streaming
   mock file:

{
 "data": {
  "testResponse": {
  }
 }
}

This is the method that does not produce camouflage errors, I see in logs that it should be returned, but in the client itself I am waiting in a debug and not getting the response, failing by timeout.

Obviously, I have tried all these options with real responses from server as well, added delays to each of the .mock files, but still did not get a positive result.

Would be very grateful for any advise to what is wrong with my implementation and how can I fix it.