tests: more verbose assert_exists() helper function
tests: more verbose assert_exists() helper function

isimluk/openscap,redhatrises/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,redhatrises/openscap,jan-cerny/openscap,OpenSCAP/openscap,openprivacy/openscap,ybznek/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,isimluk/openscap,redhatrises/openscap,postfix/openscap,jan-cerny/openscap,redhatrises/openscap,isimluk/openscap,ybznek/openscap,mpreisler/openscap,openprivacy/openscap,mpreisler/openscap,postfix/openscap,postfix/openscap,Hexadorsimal/openscap,mpreisler/openscap,mpreisler/openscap,postfix/openscap,openprivacy/openscap,redhatrises/openscap,ybznek/openscap,ybznek/openscap,openprivacy/openscap,postfix/openscap,OpenSCAP/openscap,isimluk/openscap,OpenSCAP/openscap,jan-cerny/openscap,OpenSCAP/openscap,jan-cerny/openscap,isimluk/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,ybznek/openscap,Hexadorsimal/openscap,mpreisler/openscap,postfix/openscap,isimluk/openscap,ybznek/openscap,mpreisler/openscap,openprivacy/openscap,openprivacy/openscap