public async Task CustomVectorAdd()
        {
            var channel = new ClientSessionChannel(
                localDescription,
                certificateStore,
                new AnonymousIdentity(),
                "opc.tcp://*****:*****@"  ------------------");
            logger.LogInformation($"  {result}");

            logger.LogInformation($"Closing session '{channel.SessionId}'.");
            await channel.CloseAsync();

            result.Z
            .Should().Be(6.0);
        }