The easiest way to test the circuit would be with a volt meter. Put the meter across the output and ground and apply power. The output should be around 12V for about 5 seconds and then drop off.
I only mentioned the LED because you can see it in the picture. It would be more trouble than it's worth to put it in for testing.
I only mentioned the LED because you can see it in the picture. It would be more trouble than it's worth to put it in for testing.