[CLEANUP] ResourceStorageTest needs some love

Releases: 6.2, master
Change-Id: I394540677c1a4dc5dee036614969b4fdfa80532a
Reviewed-on: http://review.typo3.org/34775
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>