gdbm: add unit tests
gdbm: add unit tests

erg/factor,mcandre/factor,mcandre/factor,erg/factor,kingcons/factor,mcandre/factor,kingcons/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,erg/factor,kingcons/factor,erg/factor,kingcons/factor,mcandre/factor,erg/factor,mcandre/factor