### Question:
GrpcClientRequest extends RpcClientRequest implements GrpcRequest { @Override public String service() { return GrpcParser.service(methodDescriptor.getFullMethodName()); } 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();  }### Answer:
@Test public void service() { assertThat(request.service()).isEqualTo("helloworld.Greeter"); }