Improved UT to modify a writable file.
Improved UT to modify a writable file.

thorsteneckel/otrs,crythias/otrs,eliasp/otrs,s7design/otrs,s7design/otrs,MBRG/otrs,brandonshults01/otrs,StCyr/otrs,moritz/otrs,capeit-tto/otrs,muehlbauer/otrs,balazj/otrs,mbeijen/otrs-1,MBRG/otrs,muehlbauer/otrs,rudy500/otrs,thorsteneckel/otrs,mburggraf/otrs,StCyr/otrs,linearregression/otrs,brandonshults01/otrs,s7design/otrs,balazj/otrs,mbeijen/otrs-1,xhoy/otrs,rudy500/otrs,StCyr/otrs,PortgasDAce/otrs,linearregression/otrs,MBRG/otrs,capeit-tto/otrs,capeit-tto/otrs,s7design/otrs,linearregression/otrs,crythias/otrs,linearregression/otrs,muehlbauer/otrs,vlascoder/otrs,oiami/otrs,oiami/otrs,PortgasDAce/otrs,xhoy/otrs,moritz/otrs,xhoy/otrs,noritnk/otrs,mburggraf/otrs,StCyr/otrs,mburggraf/otrs,thorsteneckel/otrs,nilei/otrs,oiami/otrs,eliasp/otrs,rudy500/otrs,oiami/otrs,oiami/otrs,xhoy/otrs,moritz/otrs,balazj/otrs,thorsteneckel/otrs,crythias/otrs,PortgasDAce/otrs,rudy500/otrs,linearregression/otrs,noritnk/otrs,brandonshults01/otrs,StCyr/otrs,eliasp/otrs,muehlbauer/otrs,MBRG/otrs,vlascoder/otrs,nilei/otrs,nilei/otrs,eliasp/otrs,balazj/otrs,noritnk/otrs,xhoy/otrs,s7design/otrs,nilei/otrs,muehlbauer/otrs,balazj/otrs,brandonshults01/otrs,eliasp/otrs,thorsteneckel/otrs,brandonshults01/otrs,moritz/otrs,mbeijen/otrs-1,MBRG/otrs,mburggraf/otrs,rudy500/otrs,crythias/otrs,crythias/otrs,PortgasDAce/otrs,moritz/otrs,nilei/otrs,mburggraf/otrs,vlascoder/otrs,PortgasDAce/otrs