Write tests for "drivers/gpu/drm/amd/display/include/fixed31_32.h"
To get up to speed with KUnit, write tests for the 16 functions from drivers/gpu/drm/amd/display/include/fixed31_32.h, which are used by more than 20 files in the /drivers/gpu/drm/amd/display/dc/ folder. Make sure to publish a step-by-step guide on how to prepare such a testing environment, while also gathering as much introductory material about writing unit tests with KUnit as possible.