google.protobuf.Value tests

[olegbespalov]

What?

Add the google.protobuf.Value tests

Why?

We have no tests for the google.protobuf.Value

Updates #55

[codebien]

LGTM. I don't know if it is expected but here we are testing the case where a Value is returned which means it does mostly Server -> Go -> Binary proto -> Go -> k6 grpc Client. Instead the original issue is more around providing an input: so JS -> JSON -> k6 client -> Binary proto -> ...the rest

[olegbespalov]

@codebien, we do test both input/output.

There is an RPC method:

rpc TestValue(google.protobuf.Value) returns (google.protobuf.Value);

Which uses three times with different inputs (number, string, and boolen), and the server responds based on the input.