Improve --lf/--ff test as commented during review
Improve --lf/--ff test as commented during review

markshao/pytest,tomviner/pytest,nicoddemus/pytest,The-Compiler/pytest,tareqalayan/pytest,pfctdayelise/pytest,nicoddemus/pytest,MichaelAquilina/pytest,The-Compiler/pytest,hackebrot/pytest,davidszotten/pytest,Akasurde/pytest,pytest-dev/pytest,ddboline/pytest,tomviner/pytest,alfredodeza/pytest,flub/pytest,rmfitzpatrick/pytest,txomon/pytest,RonnyPfannschmidt/pytest