Torture Test example: LED is always on

It appears that the LED should come on only if there is input to the serial monitor, then stay on for 1 second, then go off. When I upload and run it, though, the LED comes on and stays on all the time.

I can't figure out how to send something to the serial monitor from my keyboard, so I can't really test this, but that should mean that the LED is never on. Not always on.