Add test for --ff merge
Add test for --ff merge

nmfzone/hub,terry2000/hub,jpkrohling/hub,elancom/hub,terry2000/hub,tomasv/hub,hopil/hub,sbp/hub,dongjoon-hyun/hub,SanCoder-Q/hub,boris-rea/hub,ASidlinskiy/hub,sbp/hub,hb9kns/hub,terry2000/hub,whilp/hub,cpick/hub,nmfzone/hub,SanCoder-Q/hub,github/hub,nlutsenko/hub,xantage/hub,pcorpet/hub,pwaller/hub,sbp/hub,github/hub,AndBicScadMedia/hub,cpick/hub,xantage/hub,rlugojr/hub,hb9kns/hub,xantage/hub,whilp/hub,jpkrohling/hub,AndBicScadMedia/hub,jpkrohling/hub,elancom/hub,pcorpet/hub,nlutsenko/hub,github/hub,cpick/hub,whilp/hub,tomasv/hub,pwaller/hub,AndBicScadMedia/hub,rlugojr/hub,tomasv/hub,ASidlinskiy/hub,elancom/hub,github/hub,naru0504/hub,hopil/hub,SanCoder-Q/hub,ryo33/hub,rlugojr/hub,boris-rea/hub,naru0504/hub,ryo33/hub,dongjoon-hyun/hub,ryo33/hub,dongjoon-hyun/hub,pwaller/hub,hb9kns/hub,ASidlinskiy/hub,hopil/hub,nmfzone/hub,pcorpet/hub,nlutsenko/hub,naru0504/hub,boris-rea/hub