grpc C++ unit testing rpc services

[smita deshpande]

Hi, 

I am new to grpc, is there any documentation or examples explaining unit testing of server side RPC calls/services?

Thanks,

Smita

[Eugene Ostroukhov]

This is an open-ended question and depends a lot on the granularity of the tests you want. We have unit tests that test the service class directly. Sometimes we start a service on a background thread and then connect to it from the test.

There is no premade test harness that I know of. This is an example of running the server in-process: reflection test.

[smita deshpande]

I am thinking of mocking the interface grpc::internal::ServerAsyncStreamingInterface
in case of testing async server. So it would become possible to even use google Unit tests. I am having simple hello world unary call. However, I do not want to run server and test the SayHello RPC service with real client and server.

Do you think its good idea?

Thanks,

Smita

[Eugene Ostroukhov]

I would advise against mocking internal interfaces. That may make the tests increasingly brittle when you update gRPC version. Also, it may reduce the test coverage.

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