unittests/vfs: Add test case for #8309
unittests/vfs: Add test case for #8309

biboc/RIOT,basilfx/RIOT,lazytech-org/RIOT,aeneby/RIOT,authmillenon/RIOT,josephnoir/RIOT,x3ro/RIOT,neiljay/RIOT,OlegHahm/RIOT,LudwigKnuepfer/RIOT,basilfx/RIOT,OlegHahm/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,mtausig/RIOT,OlegHahm/RIOT,kbumsik/RIOT,yogo1212/RIOT,x3ro/RIOT,RIOT-OS/RIOT,gebart/RIOT,mtausig/RIOT,biboc/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,ant9000/RIOT,LudwigOrtmann/RIOT,toonst/RIOT,avmelnikoff/RIOT,avmelnikoff/RIOT,kYc0o/RIOT,yogo1212/RIOT,toonst/RIOT,smlng/RIOT,neiljay/RIOT,aeneby/RIOT,BytesGalore/RIOT,OlegHahm/RIOT,toonst/RIOT,biboc/RIOT,A-Paul/RIOT,jasonatran/RIOT,A-Paul/RIOT,miri64/RIOT,toonst/RIOT,mfrey/RIOT,biboc/RIOT,kaspar030/RIOT,LudwigOrtmann/RIOT,cladmi/RIOT,jasonatran/RIOT,lazytech-org/RIOT,aeneby/RIOT,kbumsik/RIOT,kbumsik/RIOT,mfrey/RIOT,ant9000/RIOT,josephnoir/RIOT,toonst/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,rfuentess/RIOT,avmelnikoff/RIOT,authmillenon/RIOT,aeneby/RIOT,avmelnikoff/RIOT,basilfx/RIOT,cladmi/RIOT,miri64/RIOT,kaspar030/RIOT,kbumsik/RIOT,LudwigOrtmann/RIOT,LudwigKnuepfer/RIOT,kYc0o/RIOT,ant9000/RIOT,gebart/RIOT,A-Paul/RIOT,OTAkeys/RIOT,mtausig/RIOT,kaspar030/RIOT,basilfx/RIOT,authmillenon/RIOT,jasonatran/RIOT,kaspar030/RIOT,miri64/RIOT,lazytech-org/RIOT,mfrey/RIOT,authmillenon/RIOT,smlng/RIOT,basilfx/RIOT,mtausig/RIOT,ant9000/RIOT,A-Paul/RIOT,authmillenon/RIOT,gebart/RIOT,neiljay/RIOT,rfuentess/RIOT,OTAkeys/RIOT,kaspar030/RIOT,biboc/RIOT,kYc0o/RIOT,smlng/RIOT,mfrey/RIOT,rfuentess/RIOT,OTAkeys/RIOT,yogo1212/RIOT,A-Paul/RIOT,cladmi/RIOT,x3ro/RIOT,yogo1212/RIOT,miri64/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,yogo1212/RIOT,aeneby/RIOT,BytesGalore/RIOT,LudwigOrtmann/RIOT,RIOT-OS/RIOT,mtausig/RIOT,mfrey/RIOT,josephnoir/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,BytesGalore/RIOT,jasonatran/RIOT,neiljay/RIOT,miri64/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,neiljay/RIOT,rfuentess/RIOT,gebart/RIOT,x3ro/RIOT,BytesGalore/RIOT,LudwigKnuepfer/RIOT,smlng/RIOT,rfuentess/RIOT,x3ro/RIOT,OlegHahm/RIOT,josephnoir/RIOT,OTAkeys/RIOT,cladmi/RIOT,LudwigOrtmann/RIOT,kbumsik/RIOT,cladmi/RIOT,smlng/RIOT,gebart/RIOT,jasonatran/RIOT,LudwigOrtmann/RIOT