Testing av_ambient_viewing_environment_alloc(&size)
alloc: OK, size_set=yes
illuminance=0/1, light_x=0/1, light_y=0/1

Testing av_ambient_viewing_environment_alloc(NULL)
alloc(NULL): OK
illuminance=0/1, light_x=0/1, light_y=0/1

Testing write/read back
illuminance=314/10, light_x=15635/50000, light_y=16450/50000

Testing av_ambient_viewing_environment_create_side_data()
side_data: OK
illuminance=0/1, light_x=0/1, light_y=0/1

Testing OOM paths
alloc OOM: OK
alloc(NULL) OOM: OK
side_data OOM: OK
