Are there any quick way to tell if a kernel is a high-pass filter? Im new in this image processing field so please be gentle with terminology, i have a kernel of 3x3 and i want some way in order to test if its a high pass filter or not

Thanks in advance
Proper way: do a Fourier transform and look at the magnitude of the result
Quick and dirty: take the sum of all all elements. If it's zero or small compared to the absolute sum, it has some high pass-ness to it.