mktemp: add tests
mktemp: add tests

kevgeniy/coreutils,ebfe/coreutils,tempbottle/coreutils,uutils/coreutils,uutils/coreutils,wimh/coreutils,Arcterus/coreutils,Heather/coreutils,tempbottle/coreutils,wimh/coreutils,Arcterus/coreutils,jbcrail/coreutils,uutils/coreutils,keunwoo/coreutils,kevgeniy/coreutils,jbcrail/coreutils,Heather/coreutils,ebfe/coreutils,keunwoo/coreutils