tests/unittests/tests-core/tests-core-ringbuffer: test underflow
tests/unittests/tests-core/tests-core-ringbuffer: test underflow

OTAkeys/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,miri64/RIOT,yogo1212/RIOT,smlng/RIOT,kYc0o/RIOT,mtausig/RIOT,toonst/RIOT,authmillenon/RIOT,authmillenon/RIOT,x3ro/RIOT,toonst/RIOT,authmillenon/RIOT,miri64/RIOT,kaspar030/RIOT,OTAkeys/RIOT,jasonatran/RIOT,basilfx/RIOT,x3ro/RIOT,kaspar030/RIOT,jasonatran/RIOT,kaspar030/RIOT,miri64/RIOT,ant9000/RIOT,mtausig/RIOT,authmillenon/RIOT,yogo1212/RIOT,kYc0o/RIOT,smlng/RIOT,basilfx/RIOT,RIOT-OS/RIOT,ant9000/RIOT,smlng/RIOT,basilfx/RIOT,x3ro/RIOT,kYc0o/RIOT,mtausig/RIOT,x3ro/RIOT,yogo1212/RIOT,kYc0o/RIOT,kaspar030/RIOT,OlegHahm/RIOT,yogo1212/RIOT,mtausig/RIOT,smlng/RIOT,ant9000/RIOT,basilfx/RIOT,yogo1212/RIOT,x3ro/RIOT,mtausig/RIOT,ant9000/RIOT,miri64/RIOT,authmillenon/RIOT,ant9000/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,basilfx/RIOT,jasonatran/RIOT,toonst/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,smlng/RIOT,authmillenon/RIOT,toonst/RIOT,jasonatran/RIOT,OTAkeys/RIOT,toonst/RIOT,yogo1212/RIOT,OTAkeys/RIOT,miri64/RIOT,kYc0o/RIOT,OlegHahm/RIOT