Ir sensor test app topic

I've got a feeling one of the sensors on the front of this phone isn't working. I can usually position the phone at an angle to see the faint red lights from the ir sensors on only 3 of them, but the top left corner I see nothing.

The phones responsiveness seemed better when I first got it a couple months ago but doesn't seem to wake up as easily as before.

Rooted moto x 2014 running stock and xposed, unlocked bootloader

Anyone know of an app that will test ir sensors?