Add spec to cover #672
Add spec to cover #672

moonpyk/knockout,bago/knockout,JesseQin/knockout,skyh/knockout,moonpyk/knockout,martijnwetering/knockout,xeronith/knockout,gwokudasam/knockout,Sir0xb/knockout,getshuvo/knockout,mattbalmer/knuckles,cgourlay/knockout,bago/knockout,skyh/knockout,stonegithubs/knockout,youprofit/knockout,gwokudasam/knockout,hitesh97/knockout,hitesh97/knockout,pianove/knockout,DekeYan/knockout,Sir0xb/knockout,getshuvo/knockout,xeronith/knockout,youprofit/knockout,DekeYan/knockout,pianove/knockout,martijnwetering/knockout,ErikSchierboom/knockout,JesseQin/knockout,brianmhunt/knockout,stonegithubs/knockout,ErikSchierboom/knockout,mattbalmer/knuckles,cgourlay/knockout,brianmhunt/knockout