cmd/swap: added test to verify that swap is a command.
cmd/swap: added test to verify that swap is a command.

tsuru/tsuru,kgrvamsi/tsuru,cezarsa/tsuru,guilhermebr/tsuru,Endika/tsuru,gwmoura/tsuru,mderaldo/tsuru,RichardKnop/tsuru,ggarnier/tsuru,mderaldo/tsuru,kgrvamsi/tsuru,cezarsa/tsuru,guilhermebr/tsuru,hugoantunes/tsuru,jblancett/tsuru,cgvarela/tsuru,gwmoura/tsuru,tuxmonteiro/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,ggarnier/tsuru,tuxmonteiro/tsuru,RichardKnop/tsuru,tsuru/tsuru,ArxdSilva/tsuru,hugoantunes/tsuru,ArxdSilva/tsuru,tsuru/tsuru,4eek/tsuru,cezarsa/tsuru,Endika/tsuru,tuxmonteiro/tsuru,cgvarela/tsuru,kgrvamsi/tsuru,4eek/tsuru,gciotta/tsuru,gwmoura/tsuru,gciotta/tsuru,ggarnier/tsuru,firebitsbr/tsuru,hcxiong/tsuru,gciotta/tsuru,RichardKnop/tsuru,cezarsa/tsuru,4eek/tsuru,guilhermebr/tsuru,hcxiong/tsuru,mderaldo/tsuru,ggarnier/tsuru,Endika/tsuru,tsuru/tsuru,guilhermebr/tsuru,jblancett/tsuru,firebitsbr/tsuru,jblancett/tsuru,ArxdSilva/tsuru,cgvarela/tsuru,firebitsbr/tsuru