String file tests have separate invalid args case
String file tests have separate invalid args case

LefterisJP/refuclib,refu-lang/rfbase,refu-lang/rfbase,LefterisJP/refuclib,LefterisJP/refuclib,refu-lang/rfbase,refu-lang/rfbase,refu-lang/rfbase,LefterisJP/refuclib