GrpcClientRequest extends RpcClientRequest implements GrpcRequest { @Override public Object unwrap() { return call; } GrpcClientRequest(Map<String, Key<String>> nameToKey, MethodDescriptor<?, ?> methodDescriptor,
      CallOptions callOptions, ClientCall<?, ?> call, Metadata headers); @Override Object unwrap(); @Override String method(); @Override String service(); @Override MethodDescriptor<?, ?> methodDescriptor(); CallOptions callOptions(); ClientCall<?, ?> call(); @Override Metadata headers();  }
@Test public void unwrap() { assertThat(request.unwrap()).isSameAs(call); }