public void PrefixedCommand()
        {
            string   prefix = "[this is a prefix]";
            IMessage msg    = new CommandMessage(prefix + "ping");

            int argPos = 0;

            if (!msg.HasStringPrefix(prefix, ref argPos))
            {
                Assert.Fail("Command wasn't detected to have a prefix.");
            }

            IExecutionResult result = _service.Execute(msg, argPos);

            if (!result.IsSuccess)
            {
                Console.WriteLine($"{ result.Error }: { result.ErrorReason }");
                Assert.Fail();
            }
        }