add some unit tests testing get-checksum
add some unit tests testing get-checksum

erg/factor,erg/factor,mcandre/factor,littledan/Factor,littledan/Factor,kingcons/factor,mcandre/factor,seckar/factor,kingcons/factor,mcandre/factor,mcandre/factor,erg/factor,littledan/Factor,ceninan/factor,seckar/factor,cataska/factor,erg/factor,cataska/factor,ceninan/factor,erg/factor,mcandre/factor,kingcons/factor,mcandre/factor,ceninan/factor,erg/factor,ceninan/factor,seckar/factor,littledan/Factor,cataska/factor,erg/factor,mcandre/factor,kingcons/factor,cataska/factor