How is the Linux kernel tested ?

Question

How do the Linux kernel developers test their code locally and after they have it committed? Do they use some kind of unit testing, build automation? test plans?

Answer 1

I had done linux kernel compilation and done some Modifications for android(Marshmallow and Nougat) in which I use linux version 3. I cross-compiled it in linux system, debug the errors manually and then run its boot image file in Android and check if it was going in loop-hole or not. If it runs perfect then it means it is compiled perfectly according to system requirements.
For MotoG kernel Compilation

NOTE:- Linux Kernel will change according to requirements which depend on System Hardware